Dr. Greene’s Answer:
Having a baby is a lifelong responsibility and hopefully an even greater reward — for somebody! As a mother’s belly swells, she knows with deep certainty that the child is hers. Each time the baby moves or kicks, the bond between her and her child grows.
Depending on the situation, the father may be pretty sure that the child is his. For most of history, though, dads have had to rely on circumstantial evidence as the foundation on which to build this crucial relationship. After the baby was born, he could feel more sure he was the dad if the baby looked like him (“He has your feet, Honey!”), but often these early resemblances are at least partially creative imaginations.
In 1901 biologist Karl Landsteiner distinguished between three types of blood — groups A, B, and O. A fourth group — AB — was discovered a year later by another research team. As the inheritance patterns of these blood groups were worked out over the next decades, it became possible to include the use of blood type in determining paternity by excluding some men from being the fathers of some children. For instance, if the parents both have blood type O, then the children must all have blood type O. If a child were to have blood type A, B, or AB, then the presumed father must not be the real father. If the child’s blood type were O, then the presumed father might be the real father — but so might millions of other men.
Using Blood Type in Determining Paternity:Possible and Impossible Situations
Parents’ Blood Types |
Possible Children |
Impossible Children |
---|---|---|
A & A |
A, O |
B, AB |
A & B |
A, B, AB, O |
none |
A & AB |
A, B, AB |
O |
A & O |
A, O |
B, AB |
B & B |
B, O |
A, AB |
B & AB |
A, B, AB |
O |
B & O |
B, O |
A, AB |
AB &AB |
A, B, AB |
O |
AB & O |
A, B |
AB, O |
O & O |
O |
A, B, AB |
These are general rules, though, and exceptions apply. Very rarely, gene mutations may change the rules such that “impossible children” become possible.
Today there are over 600 blood types known (as well as other tissue types called HLA types), which can make paternity testing far more accurate — but still not perfect.
Determining Father Before a Baby is Born
It is also now possible to determine the father before a baby is born. This is done by comparing DNA molecules — our genetic blueprints. To do this you need a blood sample from both the mother and the potential father (testing without the mother’s blood is possible, but more difficult — and more expensive). You also need a small sample of amniotic fluid (the water that the baby is floating in). Less than 1/4 teaspoon is sufficient for the test. The amniotic fluid may be obtained by a process called amniocentesis. This procedure is performed no earlier than 13 weeks into the pregnancy.
A court order or informed consent of all adults involved is required to proceed with paternity testing.
You will need to wait 3 to 4 long weeks for the results. Waiting for these test results can be a very anxious time. Rush orders take 10 to 15 business days, but cost about $500 extra.
Either way, if the test says that a man is not the father, then legally and truly he is not (it can absolutely exclude some men as the father of a certain child). If the test says that he is the father, then he probably is — there is about a 99.8% chance that he is. DNA testing is now legally accepted as able to determine paternity.
There are about one million two hundred eighteen thousand five hundred males in Jamaica (as of 1992). A positive DNA paternity test could limit the potential fathers to only about 2,437 of them (plus 0.2% of the tourists). Only 2 out of 1000 men could possibly be the father. As you can see, a positive paternity test is good evidence, but not an ironclad guarantee.
Paternity Testing
Prenatal paternity testing can be arranged through a company called Genelex, located in Seattle, Washington. They are very helpful, and can be reached at 1.800.523.6487 or healthanddna.com. The test costs $700.
If you wait until after the baby is born, DNA testing can be arranged through most local blood banks (many of which use Genelex). The blood sample can be obtained at birth. Otherwise, the baby should be at least 2 months old, since a fair amount of blood is needed for the test. In my area, this option costs about $600.
I realize that the circumstances that prompt a person to undergo paternity testing are often difficult. I hope that whatever you want turns out to be true. Even more, I hope that whatever turns out to be true becomes something that you learn to want.
Deseree R
I have a question regarding the RH my Father is B+ and my Mother is A+ but I am A- and my late sister was O- how does that work? I always thought that two people with RH+ could not produce a RH- child. on the other hand my husband and I are both A- and so are all three of our Children. I’m told this too is unusual.
Added:
Cheryl Greene
Hi Deseree,
The whole Rh- / Rh+ issue can be confusing, so let’s start there. If a person is Rh+ it means they have the D Antigen — they are positive for the D Antigen. But that does not mean they must pass it on. Two parents that are Rh+ have a 6.25% chance of having a child that is Rh-. So, your parents could be Rh+ and all their children could be Rh-. That would be completely normal.
On the other hand, if neither parent is Rh+, that is neither parent is positive for the D Antigen, they can not possibly pass that on. All their children will be Rh-.
Now as to the B+ and A+ parent having an O- child, we’ve already determined the Rh- is perfectly normal. But so is the type O blood. Here’s why — Blood types are comprised of two alleles. The most common (by far) are A, B, and O.
— If a person has type A blood he or she has at least one A allele. He or she can have two A alleles (AA) but can also have one A and one O (AO). Both are called type A blood.
— If a person has type B+ blood he or she has at least one B allele. He or she can have two B alleles (BB) but can also have one B and one O (BO). Both are called type B blood.
So if one of your sister’s parents had type B+ blood and the other had type A- blood there would be a 6.25% chance that she would have type O blood and a 25% chance she would have Rh- blood.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Felix
Thanks for the knowledge, but if I may ask, My father’s blood type is O+ while my mother’s blood type is A, and mine blood type is B what could be the problem then?
Added:
Cheryl Greene
Hi Felix,
Thanks for writing in.
If one parent’s blood type is O and if the other parent has type A, they can only have children with type O or type A blood.
It’s not uncommon for blood types to be different than they are thought. It is wise to have all your blood retested.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Rohit C
My Blood type is A+ and my wife blood type is AB+. Can the blood type of my child be AB-
Added:
Cheryl Greene
Hello Rohit,
The answer to your question is — yes! If one parent has type A+ blood and the other parents has type AB+ blood, they can have a child with type AB- blood. In fact, the odds are 37.5% that any of their children will have type AB blood and 6.25% that any of their children will be Rh-. If you’d like further explanation, please let me know.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Harmony
I am AB+ blood group but my dad is O+ and my mum is B+. Is my dad my biological father. I have done this test twice and it is still AB+. My siblings are all O+.
Added:
Cheryl Greene
Hi Harmony,
You mention that you have done this test twice. Have both your parents repeated the test to confirm their blood types? If so, and if your father has type O+ blood, and your mother has type B+ blood, it’s time for a paternity test.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Rosamaria
I’M O+ MY HUSBAND IS A+ OUR BABY IS O+ IS THIS POSSIBLE
Added:
Cheryl Greene
Hi Rosamaria,
Yes! If one parent has type O+ blood and the other parent has type A+ positive blood, they can have a baby with O+ blood. In fact each of their children could be O+, O-, A+ or A-. All are normal outcomes.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
AA
MY blood types is A+my wife blood types is B- my child blood types is AB+ is it possible ? Or the child belongs to other person ??
Added:
Cheryl Greene
Dear AA,
Great question. You’ll be glad to know, it is possible for one parent to have type A+ blood, the other parent to have B- blood, and their child to have type AB+ blood. In fact, there is a 56.25% chance that their child will have type AB blood and a 75% chance that their child will be Rh+.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
H A
hello
my blood type is AB+ while my wife is O+ what is the possible blood match of our child
Added:
Cheryl Greene
Hello HA,
Thanks for writing in.
If you have type AB+ blood and if your wife has type O+ blood, you could have children who are A+, A-, B+, or B-. You could not have children that are AB+, AB-, O+ or O-. This would seem utterly odd because it means your children could not have either one of your blood types. This is because each of your children will get one allele from you and one from the child’s mother. If you have type AB blood, you will either pass on an A or a B. If the child’s mother has type O blood she can only pass on an O allele. Does that make sense to you or would you like further explanation?
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Sunday P
Thanks a lot for the briefing medical tips.
Added:
Katherine
If the father is A+ and the mother is A-B- , can they have a child that’s 0-
Added:
Cheryl Greene
Hi Katherine,
Thanks for your question.
If a parent has type AB blood, they can not have a child with type O blood. That parent can only have a child with type A or B blood, no matter the blood type of the other parent. If you’d like to know how this works, let me know and I’ll be happy to explain.
Also, be aware, that blood types are often different than what they are thought to be. It’s wise to have both parents and the child retested before drawing any conclusions.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Lindi
His the one who break my virginity I’m O+ and his AB+and my is O+ also .I’m confused please help
Added:
Cheryl Greene
Hello Lindi,
In a situation where the mother knows there is only one possible father of her baby, and the outcome is “not possible” the blood types are likely different than what is thought. It is wise to have all three of you retested. If they come back the same, still an “impossible blood type” you can have a DNA paternity test run to show the father is the baby’s father. It is the only test that is considered definitive. They are fairly inexpensive, can be ordered online, taken in the privacy of your own home, mailed in, and results received by mail. They are considered 99.999% accurate.
If the DNA test proves the paternity of your baby, but the blood types are still considered “impossible”, there is a very rare blood type that might explain the inconsistency. Please let me know if that happens and we can go into the Bombay Blood Group.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Sarah C
Dear Sir,
i have some confusion, my blood type is B+, my husband is B, he is not sure + or -. but our son comes with blood AB. is impposible. i just getting to know. is anything wrong with the hospital?
look forward to hearing from you soon.
Thanking you
Added:
Cheryl Greene
Hi Sarah,
I can understand your confusion. Likely one of the blood types is not what you think it is. It would be wise to have all three blood types retested.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
khisner
Hello .. i am so confused whats this impossible child mean.. My husband is AB and i am A+ .. And our baby is O .. is it possible ? .. All i can imagine is either she got my blood type or her dad .. I hope you answer me .. Thanks..
Added:
Cheryl Greene
Hello Khisner,
When someone or a website says “impossible child” it means, if the parents have the stated blood types, they could not have a child with the blood type you’ve input. In your case, IF the father has type AB blood and the mother has type A blood, their child could not have type O blood. That combination of three blood types is impossible.
If the father has type AB blood, each of his children can have type A, B or AB, depending on the blood type of the mother.
IF the mother has type A blood, each of her children could be type O, A, B or AB depending on the blood type of the father.
You may ask why this is.
— Blood types are comprised of two alleles. The most common (by far) are A, B, and O.
— If a person has type A blood he or she has at least one A allele. He or she can have two A alleles (AA) but can also have one A and one O (AO). Both are called type A blood.
— If a person has type AB blood he or she has one A allele and one B allele.
— If a person has type O blood, both alleles are O.
— Each parent passes down exactly one allele to each of their children.
What this means for you is IF the father has type AB and the mother has type A, the father can only pass down an A or a B. He can not pass down an O allele, so it is impossible for his child to have type O blood (because that is two Os).
It’s not uncommon for blood types to be different than they are thought. It is wise to have all your blood retested before jumping to any conclusions.
I hope this makes sense, but if you have questions, please don’t hesitate to ask.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Dannie
Hello~
I consistently get frustrated by blood type charts and calculators because my sister and I are apparently impossible blood types. I want to know the infinitesimal percentage of our blood types.
My mother is O- my father was 0+ (there was never any affair or baby-switching at a hospital as I was born at home.)
I am B+ my sister is A+. I understand that mutations must have occurred for us to have the blood types we do, but what was the likelihood? I just want a number/percentage. ㅠㅠ
Added:
Cheryl Greene
Hi Dannie,
As far as I know, there are no numbers for this situation. This must be frustrating. Ideally, you would get all your DNA tested and take the results to prove your two parents are both parents to you and your sister. Then take those results to a researcher studying rare blood type mutations. I don’t know who is doing that work. It would likely be at a major research hospital or university. Since you use the past tense when referring to your father, I wonder if this is still a possibility.
There is one scenario you haven’t considered — perhaps your parents weren’t able to conceive naturally and decided together to use a sperm donor. No affair. No switching at birth. No bio father waiting in the wings to find. Just loving parents helped along by science.
Sadly, you may never have the answer you’re looking for.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
From Asia
I am a bit disturbed. Been in a long marriage and have a four-year-old child. The child has a congenital defect. Father is A negative. Mother is A Positive. The child’s blood type is AB+. Is there even a minute possibility of this?
Added:
Cheryl Greene
Dear From Asia,
Our current understanding of genetics is that it is not possible for one parent to have type A- blood, the other parent to have type A+ blood and their child to have type AB+ blood. If one parent is A- and the other is A+ they can only have children who are A+, A-, O+ or O-.
It’s not uncommon for blood types to be different than they are thought. It is wise to have all your blood retested.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Wilfene Germain
I still cannot get this genotype thing. I was told that blood type comes from the father even though other genes may come from the mother. My mother is type O, my father is type B, you’re saying that it’s normal for me to have type O?
Added:
Cheryl Greene
Hi Wilfene,
It can be confusing, but here are the basics:
What does this mean for you?
Please let me know if you have any additional questions.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
anthony
hi
im b+ the mom is A+ and baby is O. that seems to be a 6% chance baby is mine. i am doing paternity test. what is your opinion on a 6 % chance
Added:
Cheryl Greene
Hi Anthony,
Great question, but that’s not how it works.
If one parent has type A blood and the other has type B blood each of their children could have type A, B, O or AB blood. All these types are completely possible. That means if one parent has type A blood and the other has type B blood, BLOOD TYPE CAN BE USED TO SUGGEST PATERNITY.
It does mean, if one parent has type A blood and the other has type B blood, there is a 6.25% chance each of their children will have type O blood. This is still a common outcome.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Katie
Hello! I have an odd question! My mother is O- and me and my sister are both O+. My mother is not sure if my older sister is my fathers daughter as well. It could be him or another guy, but we have no clue who the other guy is. What are the chances that me and my sister would have the same blood type with different fathers? Thank you so much!
Added:
Cheryl Greene
Hi Katie,
Blood types can only provide limited information about parentage. They can exclude some possible combinations, but they can’t actually identify specific people in a family. That said, O+ is the most common blood type. 37.4% of people have this blood type. This means the chance of having different fathers is higher than if you had a rare blood type. Only .6% of people at type AB- blood, so if that was both you and your sister’s blood type, it would be much more likely you had the same father.
If you really want to get this information you can run DNA paternity test on your older sister and your father. A DNA paternity test is the only test considered definitive. They are fairly inexpensive, can be ordered online, taken in the privacy of your own home, mailed in, and results received by mail. They are considered 99.999% accurate.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
RC
Hi! Good Day.
I’m the mother O+ type my husband is B+.. is it possible that my daughter is A+? Please help me. Thank you so much.
Added:
Cheryl Greene
Dear RC,
Our current understanding of genetics is that it is not possible for one parent to have O+ blood, the other parent to have B+ blood, and their child to be A+ blood. For a child to have type A blood, one of the parents would need to have AB or A blood type.
It’s not uncommon for blood types to be different than they are thought. It is wise to have all your blood retested.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Meme
Myself and father are o+ two of our sons are A+. We know the blood types are correct due to us having blood transfusions. I have my DNA done and they sent me the raw data. Where would I look to see if maybe I’m AO
Added:
Cheryl Greene
Hi Meme,
If you are AO, that would be called A. Type O means two O alleles. Type A is one A and one O (AO) or two As (AA).
Have you had the baby’s father DNA done? Perhaps he has type A blood?
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Alicia
My mother is o+ . Confirmed by 4 different hospitals,labs and clinics.
I am AB+. Confirmed by 12 hospitals, labs , clinics, and Red Cross. We have done a maternal testing to make sure I wasn’t swapped as an infant. It’s confirmed, I’m hers.
Is this really that rare for so many doctors to tell me that it’s impossible ?
Added:
Cheryl Greene
Hi Alicia,
This is extremely rare, but there is at least one instance I know about. There may be others. It is possible, one of your blood types doesn’t fit with the ABO system. That is the case with Bombay Blood type.
About 0.0004% or 4 per million people in the general population have what is known as the Bombay Blood type. In some places such as Mumbai (which was formerly called Bombay) the occurrences can be as high as 0.01% or 1 in 10,000. This group does not fall into the ABO system and the usual tests for ABO blood show them as group O.
The Bombay blood type is usually only found in small communities where there are other people with the hh blood type. Both parents have to be h carriers, though a parent can be a carrier without actually having Bombay type blood.
DNA paternity tests are still considered accurate (99.999%) with type hh blood and are considered the only accurate test for paternity.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am NOT Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Misty
My Mom was AB+. I know this to be a fact because she was a double amputee before her death and had many blood transfusions. My dad is O+. I know this to be a fact because he is currently in the hospital and received a blood transfusion just last night. I am O+ I know this to be a fact. My dad and I both did the Ancestry DNA test and he is my biological father. My mother was my mother because my half sister who was her daughter did the DNA test also and we are half sisters. Am I a freak of nature?
Added:
Cheryl Greene
Hi Misty,
There is a very rare blood type (0.0004% or about 4 per million in the general population) known as the Bombay Blood type. In some places such as Mumbai (which was formerly called Bombay) the occurrences can be as high as 0.01% or 1 in 10,000. This group does not fall into the ABO system and the usual tests for ABO blood show them as group O.
The Bombay blood type is usually only found in small communities where there are other people with the hh blood type. Both parents have to be h carriers, though a parent can be a carrier without actually having Bombay type blood.
If you suspect you may have the Bombay blood type talk to your doctor about a specialized test for this blood type as it does not show up using the normal ABO blood type tests.
DNA paternity tests are still accurate (99.999%) with type hh blood and are considered the only accurate test for paternity.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Neville Mutua Kennedy
Hi am B+ and my wife is A+ how comes my son is A-
Added:
Cheryl Greene
Hi Neville,
Thanks for writing in.
It is completely normal for one parent to have B+ blood, the other to have A+ blood, and their child to have A- blood. Here’s how it works …
Blood types are comprised of two alleles. The most common (by far) are A, B, and O.
— If a person has type A blood he or she has at least one A allele. He or she can have two A alleles (AA) but can also have one A and one O (AO). Both are called type A blood.
— If a person has type B+ blood he or she has at least one B allele. He or she can have two B alleles (BB) but can also have one B and one O (BO). Both are called type B blood.
Rh+ means a person is positive for the D antigen. Rh- means a person does not have the D antigen. Two parents with Rh+ blood can have children with Rh+ or Rh- blood depending on if either of them pass on the D antigen or not.
Here’s how that could work out for you:
— If you have type B blood, it is comprised of one B allele and one O allele.
— If your wife has type A blood, it is comprised of two AA alleles or one A allele and one O allele.
— If your child has type A blood, he got an O allele from his father and an A allele from his mother and neither passed on the D antigen.
I hope that helps and please let me know if you’d like further explanation.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Kim
If my moms blood type is A+ and my dads blood type is O. Is it possible to have a child that is AB.
Added:
Dr. Alan Greene
Hi Kim,
Thanks for writing in.
If one parent has type A+ and the other has type O, their children can not have type AB blood.
In the above statement, “if” is key. It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Sandy
My son is one of the impossible. My husband is O+ and I’m B+ and my son is AB+. No there is no possibility of another father. I was thinking someone made a mistake on our blood type, but I got it checked by two sources. It’s crazy that they say this is impossible.
Added:
Cheryl Greene
Hi Sanday,
Thanks for writing in.
Have you done DNA testing on all three of you? I would think confirming you are the mother, father, and child with those blood types would be very interesting to researchers.
DNA tests are fairly inexpensive, can be ordered online, taken in the privacy of your own home, mailed in, and results received by mail. They are considered 99.999% accurate.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Lisa Miller
This is also my case, and of great importance to me. My mother is type A, my father type O, and I am AB+. Sandy, the writer above, said she got every one checked by 2 sources, so you suggested a DNA test for all 3 family members. I would love to know if they followed up on your advice and what the outcome was. You did mention that there are SOME exceptions to the “impossible child” rule, but didn’t go into detail. Can you elaborate, or at least confirm that if indeed mom is A, dad is O, and I am AB, then dad is not biologically dad, right?
Added:
Cheryl Greene
Dear Lisa,
The standard answer is, it is not possible for one parent to have type A blood, the other to have type O blood and their child to have type AB blood.
There are rare exceptions. These rare cases are very rare. DNA tests are still accurate, so if it is very important to you, it is well worth the cost to have the testing done. Of course, that requires cooperation from both parents, so it may not be easy.
Perhaps watch the movie Mama Mia with your mother and ask her if you might possibly have a different biological father than the man you have grown up with as your father. If she says no, then suggest a DNA test because either your father’s or your blood type would be extremely rare and it would be medically helpful for you all to know.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
jon
mom AB+ AND RH –
dad O
= an A+ child ?
Added:
Cheryl Greene
Hi Jon,
If one parent is AB+ and the other is O-, they can have a child that has A+ blood. In fact, they can have children with A+, A-, B+ or B- blood.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Caty
Hi, Two alleged fathers. One is blood type A and the other is blood type O. Mother is blood type O and child is blood type A… child really looks like none of them per say, however, shares similar forehead with the type O alleged father….. is it possible that the type O is the biological father?
Added:
Cheryl Greene
Hi Caty,
Blood types are comprised of two alleles. When a person has a child, he or she passes one of the alleles down to the child. Each child gets one from his or her father and one from his or her mother.
Blood type names are a little confusing. We call the most common blood types A, B, and O.
— If a person has type A blood he or she has at least one A allele, but the other can be O.
— If a person has type O blood he or she has two O alleles.
That means a mom and a dad with type O blood can only have a child with type O because they each can only provide an O allele. If a child has type A blood, one of the parents must have type A or type AB blood.
TIn an issue of paternity, blood types are not considered definitive. If there is a question, a DNA paternity test is the only test considered definitive. They are fairly inexpensive, can be ordered online, taken in the privacy of your own home, mailed in, and results received by mail. They are considered 99.999% accurate.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Caty
Thanks Cheryl… I thought the blood Type O alleged father would be excluded since mother is the O… reading from your teachings… my thoughts…
Added:
Cheryl Greene
Hi Caty,
Yes, you are correct. If the mother is type O and if the child is type A, the father must be type A or AB.
Best, @MsGreene
Added:
neha
Me and my husband are o+, but our child child is b+, Is it possible?
Added:
Cheryl Greene
Hi Neha,
Our current understanding of genetics is that it is not possible for both parents to be O+ and a child their child to be B+. Two O+ parents can only have children with O+ or O- blood types.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
kim
Is it possible For an O+ father to have a AB- child regardless of the mothers blood type?
Added:
Cheryl Greene
Hi Kim,
If one parent has type AB blood, he or she can only have children who are type A, B or AB.
It’s not uncommon for blood types to be different than they are thought. It is wise to have all your blood retested as the next step.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Julia
Im just wondering how likely is my bio father my actual father. He is O- and my mother is A+ and i am AB+.
Added:
Cheryl Greene
Hi Julia,
Thanks for writing in.
If you are AB+ one parent would be type A+, A-, AB+, or AB- and the other parent would be B+, B-, AB+, or AB-. But they could not both be Rh-, so if one parent was A- or AB- the other would have to be B+ or AB+. If you are AB+ neither biological parent can be O+ or O-.
It’s not uncommon for blood types to be different than they are thought. It is wise to have all your blood retested before jumping to any conclusions.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Yanel
I have an A- blood type but nobody else in my family does. What blood types would my parents have to be for me to have A- blood type?
Added:
Cheryl Greene
Hi Yanel,
Thanks for writing in.
If you have A- blood one of your parents would need to have A+, A-, AB+, or AB- blood type. The other parent could have A+, A- B+, B-, AB+, AB-, O+ or O- blood type.
If you’d like further explanation of how this works, let me know.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Brenda
Hi Dr. Greene,
If I have blood type A+, my two daughters are both A+, does this mean my husband would either have: A+, B+, AB+ or O+ blood type? We are trying to find out what blood type my husband is as he does not know.
Thank you,
Brenda
Added:
Cheryl Greene
Hi Brenda,
If one parent has A+ blood and the child has A+ blood, the other parent could be A+/-, B+/-, AB+/-, or O+/-. In other words, with the information you have you can not rule out any blood type. If you’d like an explanation, please let me know.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Michelle
If a child is RH-, would the father have B type blood?
Added:
Cheryl Greene
Hi Michelle,
The Rh system of classification and the ABO system are different.
The Rh system looks for the presence or absence of the D antigen. The ABO system describes the type of alleles that make up the blood. What that means for you is blood type B is not related to Rh+ or Rh-.
It’s like asking, could a child who is 2’3″ tall have a father that weighs 200 pounds? Yes, he could, but the two are not related.
Or put another way, a child with Rh- blood could have a father with type B blood, or type O blood, or type A blood, or type AB blood.
Does that make sense?
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
deb
Hi! If a mother is B pos and the father is A pos can the baby be O neg
Added:
Cheryl Greene
Hi Deb,
Thanks for writing in.
It is completely normal for one parent to be B+, the other to be A+ and their child to be O-. In fact there is a 6.25% that each of their children will be O-.
Please let me know if you’d like an explanation.
est, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Sarah
Hello
I am Rhesus o neg blood group what are my parents blood groups likely to be for me to get this blood group?
Added:
Cheryl Greene
Hi Sarah,
If you are Rh-, your parents could be Rh+ or Rh-. If you are Rh+, at least one of your parents must be Rh+, but the other can be Rh+ or Rh-. Basically, being Rh-, doesn’t rule out any combination, but being Rh+ does rule out both parents being Rh-.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
James
Hi Doc,
I have a child that recently had to have a blood transfusion. The mother told me her blood type is A and that she was not a match. The baby blood type is B.. so I went to go get my blood tested and I am O+.. What is the possibility of us having a child with a B type.. I need to know asap please respond,
Added:
Cheryl Greene
Dear James,
I hear your concern. If one parent has type A blood and the other has type O, each of their children can have type A or O blood, but not type B. However if one parent has type AB and the other has type O, each of their children could have type A, B or O blood.
It’s not uncommon for blood types to be different than they are thought, so it is wise to have all three of you re-tested.
If there is still a question, a DNA paternity test is the only test considered definitive. They are fairly inexpensive, can be ordered online, taken in the privacy of your own home, mailed in, and results received by mail. They are considered 99.999% accurate.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
lorna sells
please can anyone explain my rarity. i came from a dominant A group both great grandparent were As, my grandmother A, grandfather O, My mother A, father O, I am an O my husband is an O but my daughter is an A which according to the square is impossible but he is the father, my GP told us as i was worry about un necessary accusations to parentage, he said there are what they call a rare child, where both parent are an O but either mother or father come from a very dominant mutation A group can produce an A child whilst both parents are o. why can’t they mention this on the web.
Added:
Ark
Hi, so apparently both my parents are O and I’m b+… My mom just told me who my “dad” is and him and I are both curious about this. Could this still be possible ??
Added:
Cheryl Greene
Hi Ark,
Thanks for writing in.
It’s not considered possible for two parents with type O blood to have a child with type B blood. However, it is not uncommon for blood types to be different than they are thought. At this point it is wise to have all your blood retested. If they still come out the same, consider a DNA paternity test is the only test considered definitive. They are fairly inexpensive, can be ordered online and taken in the privacy of your own home. They are considered 99.999% accurate.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Barbara
My father is A+ and My Mother is A- so how could All 3 Children have A- blood ?
Added:
Cheryl Greene
Hi Barbara,
Thanks for writing in.
As I’m sure you’ve read, it is perfectly normal for one parent to be A+, the other to be A- and their child to be A-. In fact, there is a 93.75% chance each of their children will have type A blood and only a 6.25% chance each of their children will have type O blood. There is a 75% chance each child will have Rh+ blood and only 25% chance each child will have Rh- blood.
If I have read your question correctly, your concern is that all three children are Rh-, when statistically, only 1 in 4 children would be Rh-. In blood groups, the odds are calculated over a large population group. 25 children out of 100 would have Rh- blood, but that does not translate into 1 out of 4. Think about it this way, if you tossed a coin 100 times, statistically half the time it would land on heads and half the time it would land on tails. But that doesn’t mean every other time it would be tails. In fact the coin could land several times in a row on tails and laters, several times in a row on heads.
Does that answer your question? If not, let me know.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
tara
Hi i am B+ and my son is B-, what are the types of blood his father can be?
Thanks
Added:
Cheryl Greene
Hi Tara,
Thanks for writing in.
If you have B+ blood and if your son has B- blood, his father could have B+, B-, O+, O-, A+, A-, AB+ or AB- blood. As you can see, with this combination of mother and child no types are eliminated for the father. If you’d like an explanation, please let me know.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
CB
My blood type is A+,mom’s is RH+and dad’s is O+.Should I be worried about my dad not being my dad
Added:
Cheryl Greene
Hi CB,
If you have A+ blood and one of your parents has O+ blood, your other parent would need to have A+, A-, AB+ or AB- blood. If you’d like an explanation, please let me know.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Graeme
Both my”parents” blood type is 0+ and mine is 0-,am I realy their child.
Added:
Cheryl Greene
Graeme,
Thanks for writing in.
It is possible for two O+ parents to have a child with O- blood. If you’d like an explanation, please let me know.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Teresa
If I am B+ & my husband O- what will my child be? I thought her being B was normal but since I want a divorce he is now saying he wants a paternity test –
What would a child be?
Added:
Cheryl Greene
Hi Teresa,
Thanks for writing in.
If the mother has B+ blood and the father has O- blood, their child could have B+, B-, O+ or O- blood. The only blood types their child could NOT have is A+, A-, AB+ or AB-.
If there is a question, a DNA paternity test is the only test considered definitive. They are fairly inexpensive, can be ordered online, taken in the privacy of your own home, mailed in, and results received by mail. They are considered 99.999% accurate.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Sandy
URGENT OPINION REQUEST PLEASE
Hello Doctor:
I am a VERY WORRY grandmother. My Son and his Girlfriend just had a Baby, She is O+ and my Son is A+ and the Baby turns out to be B+. How can this be? possible? on top of that the Baby is Albino. We are going to do a Saliva DNA Test next week, the Baby will be 1 month old.
Sandy
Added:
Cheryl Greene
Dear Sandy,
Thanks for writing in.
It seems you’ve read the above article (and possibly many others) that state an O+ parent and a B+ parent can not have an A+ child. From everything we now know about genetics, that is true. But keep in mind, it is common for blood types to be different than they are thought. This can happen as a lab error, a reporting error, or someone remembering a different type than they were told.
A DNA test is the best way to move forward. They are extremely accurate and considered definitive in determining paternity.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
menkir
my blood type is B- am i going to have a baby ?
Added:
Dr. Alan Greene
Being B- does not need to prevent someone from having a healthy baby, but it’s important for the people caring for you to know that you are Rh-
Added:
James
Is it possible for a O+(Father) and B+(Mother) have a B- child?
Added:
Cheryl Greene
Hi James,
Thanks for writing in.
Yes, it is possible for an O+ parent and a B+ parent to have a B- child. In fact, there is a 75% chance their child will have type B blood and a 6.25% chance their child will be Rh-.
If you’d like an explanation, please let me know.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Susan
Hi! Good afternoon, is there a possibility that the child is O+ considering both his parents are A+?
Added:
Cheryl Greene
Hi Susan,
Thanks for writing in.
Yes, it is possible for both parents to be O+ and their child to be A+. This is perfectly normal. If you’d like an explanation, please let me know.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Melissa
My blood type is A+ and my ex husband’s blood type is B- and there have been questions about the paternity of one of our three kids. She is O but I can’t remember if she is +or-. Her sister is A- but I do not know her brother’s blood type. But there is no question of their paternity. Is it more likely that my ex husband is not her father? Thanks
Added:
Cheryl Greene
Hi Melissa,
If one parent is A+ and the other is B-, they can have children who are O+ or O-. They can also have children who are A+, A-, B+, B-, AB+ or AB-. As you can see, with this parent combination, no blood type is impossible.
If there is a question about paternity, a is the only test considered definitive. They are fairly inexpensive, can be ordered online, taken in the privacy of your own home, mailed in, and results received by mail. They are considered 99.999% accurate.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Melissa
Thank you!
Added:
Johnson
Hi Dr father’s blood group ab+ and mother’s b+ and child’s B- is it possible
Added:
Cheryl Greene
Hi Johnson,
Thanks for writing in.
Yes, if one parent is AB+ and the other is B+, they can have a child with B- blood.
It is possible for two parents with Rh+ blood to have a child with Rh+ or Rh- blood.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Kim Bridges
I am AB positive and my husband is O negative. Our daughter is B negative. Is that considered correct?
Added:
Cheryl Greene
Hi Kim,
Thanks for writing in.
If one parent is AB+ and the other is O-, they can have a child who is B-. They can also have children who are B+, A+ or A-.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Suraj
My Brother And His Wife Both Are” O” Positive But The New Born Child Has Got “A “Positive As His Blood Group. Is That Possible
Added:
savio
The mother is o- & father is o+ & the child is born A+, is it possible??
Added:
Jsr
My Bd group is B+ve , My Wife bd group is O +ve , which bd group possible in baby .
Added:
Cheryl Greene
Hello Jsr,
If one parent is B+ and the other parent is O+, each of their children can be O+, O-, B+ or B-.
I hope that’s helpful.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Suhail Ahmad
If the father is B+ve and mother is O+ve, can the child be B-ve?
Suhail Ahmad (Pakistan)
Added:
Cheryl Greene
Hello Suhali,
Thanks for writing in.
If one parent is B+ and the other parent is O+, they can have a child who is B-. This is very normal.
Please let me know if you’d like an explanation.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Dean
Hi, my father is O RH+ and my mother is B RH+ what are the chances of me being O RH- ??
From Dean
Added:
Cheryl Greene
Hi Dean,
Thanks for writing in.
If one parent has type O+ blood and the other has type B+, each of their children have a 75% chance of having type B blood, a 25% chance of having type O blood, a 93.75% chance of being Rh+ and a 6.25% chance of being Rh-. This means each child would be more likely to be B+, B- or O+ than being O-, but all four possibilities are perfectly normal.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Neha
Hi
My father’s blood group is O+
My mither’s blood group is also O+
Bt my blood group is B+ how is it possible
Plzzz reply imidately
Added:
Cheryl Greene
Neha,
Thanks for writing in.
Our current understanding of genetics is that it is not possible for both parents to be O+, and their child to be B+. Two O+ parents can only have children who are O+ or O-.
However, it’s not uncommon for blood types to be different than they are thought. It is wise to have all your blood re-tested before further inquiry.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Tracy
Me and my husband are O+ but my son was born with AB blood type. How could it be possible ? However my dad is B+. I am researching if grandparents blood type can pass it on to grandkids?
Added:
Cheryl Greene
Tracy,
Thanks for writing in.
If both parents have type O blood, their children can only have type O blood. Type B can not skip a generation.
It is wise to have all your blood re-tested. It’s not uncommon for blood types to be different than they are thought.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Tracy
Neha,
Me and My husband are O+ and our son is B+ You are not alone. The chart above is “impossible child “is so wrong. I also researched on that.
Added:
J. Nelson
HHi, Tracy – my parents are both O+ and my blood type is B+ ; How is this possible? You said you researched this, so I am hoping you can answer. Thanks! Jillie
Added:
Jay Jay
Please help, I am O+ my boyfriend is AB- is it possible me to carry our child to full term and for us to have healthy children together ? We have had a couple of early miscarriages and am wondering if our blood is compatible and what we can do to aid in having a healthy baby together. Thank you
Added:
Cheryl Greene
Jay Jay,
I’m so sorry for your loss.
Blood type incompatibility is only an issue if the mother is Rh- and the father is Rh+. Dr. Greene writes about it here.
Wishing you all the best as you continue to try to have children.
Sincerely, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Jay Jay
Thank you for your kind reply and best wishes. What about ABO incompatibility? Is this a significant concern? Anything we can do to help our situation if so?
Thank you so much
Added:
Mackenzie P-W
My dad is A- and my mum is A+, what are the possible blood types their children (me and my sisters) could be.
Added:
Cheryl Greene
Hi Mackenzie,
Thanks for writing in.
If one parent is A- and the other is A+, each of their children could be A+, A-, O+ or O-.
Let me know if you’d like and explanation.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Ayan
Hello doctor my blood group is AB+ & my wife O – now what is the possibility in our child?
Added:
Cheryl Greene
Hi Ayan,
Thank you for writing in.
If your blood type is AB+ and your child’s mother’s blood group is O-, your child could have A+, A-, B+ or B- blood.
I hope that’s helpful.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Monika
will Father’s A- and Mother’s B+ affects baby’s health??
Added:
Cheryl Greene
Hi Monika,
Thanks for writing in.
Sometimes there is an issue with blood type incompatibility, but it’s only if the mother is Rh- and the father is Rh+. You can read Dr. Greene’s explanation here.
I hope that’s helpful.
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Donalyn Caudill
Will o positive and o negative harm the baby I am just now about to ovulate. I am o positive my husband to be is o negative.
Added:
Cheryl Greene
Hi Donalyn,
Thanks for writing in.
You may have heard of blood type incompatibility. That is only an issue if the mother has Rh- blood and the father has positive blood. You can ready about that in Dr. Greene’s article How To Determine and Manage Rh Incompatibility.
I hope that is helpful.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Wanda
I am O- mother and my husband is a B+ father. What blood types will our children be?
Added:
Cheryl Greene
Hi Wanda,
Thanks for writing in.
If the mother is O- and the father is B+ their children can be O+, O-, B+, or B-.
Has your doctor talked to you yet about Rh incompatibility? This is of concern when the mother is Rh- and the father is Rh+. Dr. Greene writes about it here.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Ali
Hi sir my blood group is o positive and my wife group is b negative but my baby group is b positive is this possible?
Added:
Cheryl Greene
Ali,
Thanks for writing in.
Yes, if you are O+ and your baby’s mother is B-, it is possible for your baby to be B+. This is an expected outcome.
Please let me know if you’d like an explanation.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
tom
my wife has 0- blood and i have b- blood . we are planning to have a baby . is there any problem with this blood types ? will the baby have problem or my wife ?
i need an answer because ive heard that with this type of blood there are complications.
waiting for your answer thank you
Added:
Cheryl Greene
Dear Tom,
Thanks for writing in.
If your wife’s blood type is O- and if your blood type is B-, you should not have a problem. Dr. Greene discusses this in an article that addresses Blood Type Incompatibility. The problem is only if the mother has Rh- blood and the father has Rh+ blood.
It would be wise to confirm your blood types in case you are actually Rh+. There are medicines that can be taken to deal with blood type incompatibility issues, but they should be given at the appropriate time and confirming your blood types in advance can be helpful.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
asda
Hello Doc , is it possible that my parents have O + and B + blood group but I have B – blood group ?
Added:
Cheryl Greene
Hi Asda,
Thanks for writing in.
Yes, it is possible and even normal for one parent to be O+, the other parent to be B+ and their child to be B-. Let me know if you’d like an explanation.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Brittany
Hey, mother has 6 kids 1 to first marriage, 2 to second, then 3 to last, i am the second youngest. My mother is A+ Father is A- and i’m A- mother did not have any shots for this could this be a factor of why i was born premmie? i was born at 26 weeks.
Sibling blood types: 1st A+, 2nd O- 3rd ?, 4th ?, 5th A- (me), 6th ?
Added:
Cheryl Greene
Hi Brittany,
Thanks for writing in.
It sounds like you are concerned about Blood Type Incompatibility. As Dr. Greene writes, there is no issue with the mother has Rh+ blood. The only issue is if the mother has Rh- blood and the father has Rh+ blood.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Roderick K Roy
My Blood group is B+ My wife Blood Group is B+but my son has A+ & my daughter has O+. I am really confused why the children’s blood group don’t match what you said.
Added:
Cheryl Greene
Hi Roderick,
Thanks for writing in.
Our current understanding of genetics is that it is not possible for both parents to have B+ blood and a child their child to have A+ blood. If both parents have B+ blood, it is possible for their child to have O+ blood.
It is wise to have all your blood re-tested. It’s not uncommon for blood types to be different than they are thought.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Luis
Mom’s type is B+(regularly has blood clotting issues so we know) and mine is AB- (regularly get my red cross letters in the mail reminding me to donate plus I checked) and my son was typed o+. We re-checked and I even did a paternity test to make sure and he is definitely mine so those mutations definitely do happen.
Added:
Samiksha thakur
Hlo sir; i am my parent’s first child and i am O+ my mother is B negative and my father is O+ but my younger brother is B+
My mother did not get any treatment for the incompatibility issue during my brother’s birth..
I do’nt understand inspite of that nothing happened to my brother diring or after birth due to issue of rh incompatibility
Added:
ashish shrivastava
i m o positive and wife is b positive, is it possible to have son o negative
Added:
Cheryl Greene
Dear Ashish,
Yes, it is possible for one parent to have B+ blood, the other parent to have O+ blood and their child to have O- blood. If you’d like an explanation, please let me know.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Tom
Hello,
Is it possible to determine paternity if I know my blood type (father) and the babies blood type without knowing the mothers blood type?
I’m type A and the baby is B or B –
Added:
Cheryl Greene
Hi Tom,
Thanks for writing in.
If you (the father) are type A and if the baby is type B, the mother could be type B or type AB. She could not be type A or O.
I hope that’s helpful.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Tina
If both parents are A+, is there any way they could have a child who is RH- ????
Added:
Cheryl Greene
Tina,
Thanks for writing in.
If both parents are Rh+ it is completely normal for them to have a child that is Rh-. If you’d like an explanation, please let me know.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
rdy11
If my husband and I are both O+, how is our baby A+? Is that possible?
Added:
Cheryl Greene
Dear rdy11,
Thanks for writing in.
Our current understanding of genetics is that it is not possible for two O+ parents to have a child that is A+. However, it is fairly common for blood types to be different than they are thought.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
nelson odhiambo
Nelson
Hi am bloood group o (+ve) and am enged to a lady of blood group o(-ve) but unfortunately she had a miscarriage in her fast pregnancy so if i can ask are there chances that the next pregnancies may have an automatic miscarriege, and if so what measures can be put in to resolve the problem?
Added:
Christian
If a mother and baby are B- and the possible fathers are both O-, how does this work, can both possible fathers be the father, or can both not be the father?
Added:
Alexandra Carmichael
Hi Christian,
Thanks for writing in! Based on our current understanding of genetics, yes, either of the O- fathers could produce a B- baby with a B- mother.
Good luck, I hope that helps,
Alexandra
(caring helper at DrGreene.com, not a doctor)
Added:
Hawra
Hi Iam hawraa from iraq. I blood me O+ and my father A+ and mother B+ but how Iam O+?
Added:
christina
My dad is A+ blood, my mom is O+ blood, I have 2 sisters, and 2 brothers, who are ALL either A+ or O+ blood type(we were blood typed to be tested for compatibility for a kidney transplant for my dad). I found out I am O- blood. Can this happen with both parents being POSITIVE AND all 4 siblings are POSITIVE, I am the only negative? Thanks!!
Added:
Cheryl Greene
Hi Christina,
Thanks for writing in.
Yes, it is completely normal for one parent to be A+, for the other parent to be O+ and their child to be O-. In fact, there is a 75% chance each of their children will be type O and a 6.25% chance each of their children will be Rh-.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Donna
If a mother is o positive and the father is -rh negative what type blood should the baby have ?
Added:
Cheryl Greene
Hi Donna,
Thanks for writing in.
Each person has a blood group (ABO) are the most common types (by far) and is either Rh+ or Rh-.
Without knowing the father’s ABO blood group, I can not tell you the possibilities for the baby’s ABO type.
If both parents are Rh-, their children can only be Rh-. If both parents are Rh+ or if one is Rh+ and the other is Rh- each of their children can be Rh+ or Rh-.
I hope that’s helpful.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Meenakshi Murugappan
Hi Dr, good day
both of my parents are rh positive and i am a twin…my twin brother is eh positive and i am rh negative …is that possible?
have a good day
Added:
Cheryl Greene
Dear Meenaski,
Thanks for writing in.
If both or your parents are Rh+, and you fraternal twin brother is Rh+, you can be Rh-. This is a completely normal outcome.
I hope that’s helpful,
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Andi J
Hello Dr. Green,
I am a mother of five, who gave birth naturally to all of my children. I am an O- blood type and my husband is B+. Four of my children are B+ and one is AB+. So clearly, it is NOT impossible for an O- and B+ combination, to have an AB+ child. My eldest daughter was convinced my son was switched at birth, for years because of doctors like you, missinforming people. It isn’t impossible, it’s “improbable”. My son, who is AB+ is the spitting image of my brother and neveer left my, or my husband’s sight, from the time I delivered him, until we took him home. He was also born with VERY distinct features and I mean VERY! After years of arguing with my daughter and other people, including scientists and doctors, we’ve discovered other people like myself, who have children that, according to science and/or DNA, could not possibly be theirs. The funny thing is, my son is unquestionably my husband’s child. The questionable parentage was me, but I digress. The people I found like myself, turned out to have Chimerism, which explains the different blood type and DNA. So again, it’s improbable, VERY improbable, but by no means impossible.
I hope you will look unto this for yourself and ammend the information you provide others accordingly. A lot people can be hurt because of one tiny peice of missinformation.
Added:
Cheryl Greene
Andi,
Thanks for writing in. I point out with my comments that I’m not a doctor (I did not write this post), but I am very eager to learn. Can you tell me more about your Chimerism? Did you have a fraternal twin? If your blood type shows up as O, how do you know you carry A? Did you have a DNA test?
Thanks again. I love to learn!
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Tonya
I am confused about the RH factor. I do understand the ++/–. I also understand the lettering. Me with B RH- blood and mother being AB positive and father having O positive is it possible or probable for this to be my biological father?
Added:
Cheryl Greene
Hi Tonya,
Thanks for writing in.
The Rh factor is confusing. Rh+ means a person is positive for the D antigen. Rh- means a person does not have the D antigen or is negative for the D antigen.
— If a person is Rh+, he or she can have a child that is Rh+ or Rh-.
— If a person is Rh-, he or she can only have a child that is Rh+ if the other parent is Rh+.
— Two parents with Rh- blood can only have children with Rh- blood and can not have a child with Rh+ blood.
— Two parents with Rh+ blood can have children with Rh+ or Rh- blood.
What this means for you is, If your mother is AB+, and if your father is O+, they could have a child who is B-. This would be perfectly normal.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Tonya
Thank you for clearing this up for me. I was confused with both of my parents being positive on how I am RH -.
Added:
Charlie
Dr.
My mother is O+ and my father is AB. I just tested and found out I am O+. It says it is impossible for my father to be my biological father. I read there are exceptions. What are the chances that my father is ny father number wise?
Added:
Cheryl Greene
Hi Charlie,
Thanks for writing in.
First it would be wise to confirm your father’s blood type as AB. It is not uncommon for blood types to be different than what you think they are.
If you are O+ and if your father is AB, it would be extremely rare. In this case, a is the only test considered definitive. They are fairly inexpensive, can be ordered online, taken in the privacy of your own home, mailed in, and results received by mail. They are considered 99.999% accurate.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Ahmed Mukit Haider
What would happen if a husband A+ and wife have B- blood group? Or any problem can happened? What about our future child?
Added:
amber
My blood type is A+, My husband is also A+, my daughter was born A+.
She’s now Rh negative. How did that happen?
I read a bunch of questions here, I’m thinking her husband has Rh negative.
She has 2 children, had a complication when the first was born and had to get a shot to prevent problems with the second.
Is it possible(as I read here) that if her husband was Rh neg, it was passed to my daughter during birth?
Added:
aktarul
Hello Dr,
I do have a question , can you please help me with this one ?
My blood group is O Positive,and my wife is A Negative.
is this create problem on our life ?
Thanks for your attention and help
Added:
Teri
My parents were O positive, I’m A positive, can that be? They told me I wasn’t adopted.
Added:
Cheryl Greene
Dear Teri,
Thanks for writing in.
Our current understanding of genetics is that it is not possible for two O+ parents to have a child that is A+. Two O+ parents can only have children who are O+ or O-.
It is wise to have all your blood re-tested. It’s not uncommon for blood types to be different than they are thought.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
lena
Hi! My blood type is A+,but my parents are Type B and type O, is it really possible?
Added:
Cheryl Greene
Iena,
Thanks for writing in.
Our current understanding of genetics is that it is not possible for one parent to have type B blood and the other parent to have type O blood, to have a child with type A blood.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Ziva
Hello Dr, i do have a question , can you please help me with this one ?
My Mother is Rh O Positive,and my is Father Rh O Positive, and i’m O Negative.
I have many health problems and no one in the family have the same ones
Should i get a DNA test or that is possible :)
Thanks for your attention and help
Added:
Cheryl Greene
Hi Zeva,
Thanks for writing in.
If both parents are positive, there is a 6.35% chance that each child will be O-. I do not know of negative health outcomes associated with this particular combination.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Bammy
Husband and wife A and B blood group respectively can have children with blood group O… How??
Added:
Cheryl Greene
Hi Bammy,
Thanks for writing in.
Blood types are comprised of two alleles for the “letter type”. The most common letters (by far) are A, B, and O. Here is how that looks:
Type A = AA or AO
Type B = BB or BO
Type O = OO
Type AB = AB
If one parent is type A and is AO (not AA) and the other is type B and is BO (not BB), each parent can provide an O allele so their child would be type O, which is always OO. Does that make sense to you?
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Chinmayee
Hi …my blood group is A+ and my husband’s is B+…..my son’s blood group is O+
Is it possible?
Added:
Cheryl Greene
Chinmayee,
Thanks for writing in.
If one parent is A+ and the other is B+, it is possible for their child to be O+. If you’d like an explanation, please let me know.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Ayesha Siddiqua
mother blood type is A- who has always been perfectly healthy just delivered her second child. The father is of blood type O+. which disorder would you expect in this childdue to rhesus incompatibility?
Added:
Cheryl Greene
Ayesha,
Thanks for writing in.
It depends on several things — if the mother is Rh- and the father of her first pregnancy is Rh+, the doctors likely treated her at the time of the birth of her first baby. In that case, mother and baby are covered. If the mother is Rh- and the father is also Rh-, no treatment is needed.
You can read all about it at Dr. Greene’s article — How To Determine and Manage Rh Incompatibility.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Robin
My mother is O- blood my father was AB but refused to tell me + or -. He died last year on my 46 birthday. I need to know if its possible for me to have A+ blood regardless of Rh factor. Over the years my two older siblings have found that my mother lied to them.
Please help me.
Signed desperate
Added:
Cheryl Greene
Dear Robin,
First, I’m so sorry for your loss.
Sadly, you do not have enough information to know for sure. If your mother is O- and your father was AB+, then you could be A+, but if your mother is O- and your father was AB-, you could not be A+. At least one parent has to be Rh+ for their child to be Rh+.
Here is a question for you — did your mother get treatment for blood type incompatibility? If she is Rh- and if the father of her children was Rh+, she would need to have treatment after her first pregnancy, for all subsequent pregnancies.
Also, blood types are often different than thought, so you can’t be sure your mother is O-, unless that’s been confirmed.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
yelod
A mother who is A+ and a father who is B-. what will the childs blood type be?
Added:
Cheryl Greene
Hello Yelod,
Thanks for writing in.
If one parent is A+ and if the other parent is B-, each of their children can be A+, A-. B+, B-, O+, O-, AB+ or AB-. This parental combination is the only one that doesn’t rule out any outcome!
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Robert
I have a question I have A+ blood and both my parents were all O-is that possible for me to have A+ blood type
Added:
Cheryl Greene
Hi Robert,
Thanks for writing in.
Our current understanding of genetics is that it is not possible for two O- parents, to have a child with A+ blood.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Kaisar
I am A+ and my wife is B-……Now what will be my child blood group?
Added:
Alexandra Carmichael
Hi Kaisar,
Thanks so much for writing in! If you look at the chart in the article above, it’s possible that your child will be A, AB, B, or O, and either Rh+ or -.
Hope that helps!
Alexandra (caring helper at DrGreene.com, not a doctor)
Added:
swapna
hi doctor,
my father has B+ ,mother has 0+ve.But mine is B -ve.is it possible to become Rh-ve type while both parents have Rh+ve.
Added:
Alexandra Carmichael
Hi Swapna,
Thanks so much for writing! Yes, based on our current understanding of genetics, this is possible. Dr. Greene explains here – https://www.drgreene.com/qa-articles/determine-manage-rh-incompatibility/
Hope that helps!
Alexandra
Caring helper at DrGreene.com, not a doctor
Added:
Sam
Hey is it possible for the children of both parents B to be A? Under what circumstances can this be so?
Added:
Alexandra Carmichael
Hi Sam, thanks for writing in!
Our current understanding of genetics says that it’s not possible for two B parents to have A children, only B or O children. However, it’s wise to consider having your blood re-tested. It’s not uncommon for blood types to be different than they are thought.
Hope that helps!
Alexandra (caring helper at DrGreene.com, not a doctor)
Added:
Jacquisha Lewis
I do not know my blood type as of yet, but my daughter blood type is B+ and her daddy blood type is O+, what can my blood type be?
Added:
Cheryl Greene
Hi Jacquisha,
Thanks for writing in.
If your daughter’s blood type is B+ and if her father’s blood type is O+, your blood type could be B+, B-, AB+ or AB-. All of these would be perfectly normal.
I hope that helps,
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Dr. Vinay Shedbalkar
Your website and the clarifications given are fantastic. You are doing a great service. Please let me know if I can be of any help.
Added:
Kay Mogh
Hi,
My dad is A+ and mom is O+. Recently my daughter was tested do to pregnancy and was told that she is O- with RH-. I know her father is B+ and I thought I was O+, but now I’m not so sure. Her doctor told me that she had to have gotten her rare blood type from me. Is this true? Is it possible that I am also O- RH-?
Added:
Cheryl Greene
Kay,
Thanks for writing in.
First, I’m not sure what your doctor was referring to, so I can’t address that, but it is possible for one parent to be A+ and the other to be O+ and their child to be A-.
The odds of an A parent and an O parent having an O child are 75%. The odds of two Rh+ parents having an Rh- child are 6.25%.
Blood types are comprised of two alleles. The most common (by far) are A, B, and O.
Here is how that looks:
Type A = AA or AO
Type B = BB or BO
Type O = OO
Type AB = AB
Each person also has the presence of D antigen (which we call Rh+) or the absence of D antigen (which we call Rh-).
In the case you propose, if the dad is AO and the mother is OO, the child gets and O from each parent, but doesn’t get the D antigen from either.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Haworu
I am Haworu Lule Joseph, my blood group is O+ve and for my madam is O+ve too, but one of my children is B+ve, how could it be please can you advice me on this issue
Added:
Cheryl Greene
Haworu,
Thanks for writing in.
Our current understanding of genetics is that it is not possible for two parents to be O+ and their child to be B+.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Shrea
Hey,
My name is Shrea, my father is O+ and Mother is B+ and my blood group is A+, We have checked several times. How is it possible?
Added:
Cheryl Greene
Shrea,
Thanks for writing in.
For a child to have A+ blood, at least one parent must have A or AB blood and at least one parent must be Rh+.
If there is a question, a DNA paternity test is the only test considered definitive. They are fairly inexpensive, can be ordered online, taken in the privacy of your own home, mailed in, and results received by mail. They are considered 99.999% accurate.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Rosa Newman
How do you become b positive
Added:
Cheryl Greene
Rosa,
Thanks for writing in.
Blood types are inherited from parents. If a person is B+ one if his or her parents must be B or AB and one of his or her parents must be Rh+.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Kasturi Ranjan Sahoo
Kasturi Ranjan,
If my father is B+ & my mother is also B+ then i become B+.
2) if my father is B+ & mother is O+.
3)if my father is A+ & mother is B+.
4)if my father is AB+ & mother AB+.
5)if my father is AB+ & mother B+.
6)if my father is AB+ & mother O+.
Only in these cases i can have B+ otherwise B+ is not be possible.
B+ can possible if a positive male is mating with a positive female in 99% of cases.
Added:
Danielle
Hello my father says he is O+ but i did a test and came back as AB+, is this possible. I don’t know what blood type my mother is.
Added:
Cheryl Greene
Danielle,
Thanks for writing in.
Our current understanding of genetics is that it is not possible for a parent to be O+, and their child to be AB+. An O+ parent can only have children who are O+ or O-.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Sally
If a Mother is AB positive/RH positive and the Father is B positive/RH Positive, can they have an AB negative/RH Negative child?
Added:
Cheryl Greene
Sally,
Thanks for writing in.
Yes, it is possible for a Mother to beAB positive/RH positive and a Father to be B positive/RH Positive, and their child to be AB negative/RH Negative.
At least one parent has to be positive for a child to be Rh positive, but a child can be RH negative if both parents are RH negative, one parent is RH positive and the other is RH negative or both parents are RH positive.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Mahitha Chitturi
Both the parents have blood group A and the baby got blood group O. Justify….
Added:
Cheryl Greene
Mahitha,
Thanks for writing in.
Blood types are comprised of two alleles. The most common (by far) are A, B, and O.
If a person has type A blood he or she has at least one A allele (this can be AA or AO).
If a person has type O blood he or she has two O alleles (OO).
If both parents are AO, each parent could pass down the O allele and the child would be OO or what we call O.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Thalia Hinds
My blood type is A positive and my husband is O positive what will be the blood type of our child?
Added:
Cheryl Greene
Thalia,
Thanks for writing in.
If your blood type is A+ and if the father of your baby’s blood type is O+, your baby could be A+, A-, O+ or O-. All of these would be perfectly normal.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Lee ann
Hi doc,
My blood type is O and my husband is also O.. How could it be possible that may baby’s blood type is B+??
Added:
Cheryl Greene
Lee Ann,
Thanks for writing in.
Our current understanding of genetics is that it is not possible for both parents to be O+ and their child to be B+.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
alan
The father is O+ve , mother is A+ve . what is the chance for the kid to be B+ve ?
Added:
Cheryl Greene
Dear Alan,
Thanks for writing in.
Our current understanding of genetics is that it is not possible for one parent to be O+, the other parent to be A+ and their child to be B+. If one parent is O+ and the other is A+ each of their children can be O+, O-, A+ or A-.
It’s not uncommon for blood types to be different than they are thought. It is wise to have mother, father and child retested if there is a question.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Alberta
I am ab+. My daughter is ab+. My husband was 0-. We had a DNA test as we were told this was not possible…. but it came back 99% that she is his daughter…. how as so many said it was not possible? Now doctors are freaking out….
Added:
Cheryl Greene
Alberta,
Thanks for writing in.
Perhaps talk to your doctor about Bombay blood type. It is a very rare blood type (0.0004% or about 4 per million in the general population). This group does not fall into the ABO system and the usual tests for ABO blood show them as group O.
The Bombay blood type is usually only found in small communities where there are other people with the hh blood type. Both parents have to be h carriers, though a parent can be a carrier without actually having Bombay type blood. There are specialized tests for this blood type as it does not show up using the normal ABO blood type tests. Perhaps your husband has this type of blood.
DNA paternity tests are still accurate (99.999%) with type hh blood and are considered the only accurate test for paternity.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Mandar
My question is if husband is B +ve and wife is o +ve than what is child’s possible blood group?
Added:
Cheryl Greene
Dear Mandar,
If one parent is B+ and if the other is O+, each of their children can be O+, O-, B+ or B-. Each of these types is completely normal.
Thanks for writing in. Here is the answer to your question:
1. The average stretched length of the penis before puberty is somewhere between 2.1 and 2.9 inches.
2. The average stretched length of the adult penis, after puberty is complete, is between 4.6 and 5.8 inches (though a more recent study of 6200 boys, mostly white, from Bulgaria, put the average at 3.1 to 4.3 inches).
3. During puberty it is normal for the stretched length to range between 3 and 4.5 inches.
4. It can be normal in our culture to begin puberty as early as 10 years old or as late as 14.9 years old.
5. Puberty is NOT set by your age, but by your Tanner Stage (the system doctors use to evaluate development during puberty).
6. If you are not in the normal range for your stage of development, or if your development is before age 10 or after age 14.9, it’s wise to discuss this with your pediatrician.
7. During puberty it is recommended that you have a physical exam once a year. Unless you are particularly concerned or are far outside the guidelines above, you can bring this up at your next annual exam.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Simon
Hi
If I am A- and my mother is O+ what could my father be?
Added:
Cheryl Greene
Hi Simon,
Thanks for writing in.
If your mother is O+ and if you are A-, your father could be A+, A-, AB+ or AB-.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Cassandra
Hello I am O negative and I just had my first child who came back O positive his father does not know his blood type going off of our child’s blood type what would his father be ?
Added:
Cheryl Greene
Hi Cassandra,
Thanks for writing in.
If you are O- and your child is O+, his father could be O+, A+, or B+. He could not have RH- blood and he could not be AB+.
Did your doctor discuss blood type incompatibility with you? If not, please bring it up with her.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
shahib malik
Hi. doctor my question is if husband have the blood group A+ and mother have A- then is there is problem to give a birth to newborn baby?
Added:
Cheryl Greene
Dear Shahib,
Thanks for writing in.
If the mother is A- and the father is A+ there can be problems for babies AFTER the first child. Doctors need to monitor the mother during pregnancy and immediately following birth. If there are issues the doctor can provide treatment for the mother to prevent issues. You can find out more by clicking here.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Alison
Can a O negative have a ab+ baby?
Added:
Cheryl Greene
Alison,
Thanks for writing in.
Our current understanding of genetics is that it is not possible for a person with type O blood to have a baby with type AB blood. It is possible for a person who is Rh- to have a baby with Rh+ blood, if the other parent is Rh+.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Laura
My birth mother had blood type B+ and my father had blood type O (not sure if + or -). I have type O blood (not sure if + or -).
What are the chances that I have blood type O- and what are the chances that I have blood type O+ ?
Added:
Cheryl Greene
Hi Laura,
Thanks for writing in.
If your biological mother had B+ blood and if your biological father had O+ blood, and if you are type O there is a 93.75% chance you are Rh+ and a 6.25% chance you are Rh-.
If your biological mother had B+ blood and if your biological father had O- blood, and if you are type O there is a 75% chance you are Rh+ and a 25% chance you are Rh-.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Tahlia
I just found out I’m O+ and my mum thought I was A+ since I was born but I found out by the doctors I’m O+, so my question is my dad blood type A+ and My mum blood type is O- and my blood type is O+ how does that work???
Added:
Cheryl Greene
Hi Tahlia,
Thanks for writing in.
Blood types are comprised of two alleles. The most common (by far) are A, B, and O. Each person also has the presence of D antigen (Rh+) or the absence of D antigen (Rh-).
— If a person has type A+ blood he or she has at least one A allele (this can be AA or AO) and the presence of D antigen.
— If a person has type O- blood he or she has two O alleles (OO) and does not have the presence of D antigen.
What this means for you:
— If your mum is O- she could only pass an O allele to you and could not pass the D Antigen.
— If your dad is A+ he could pass either an A or an O and could pass the D Antigen.
— If you are O+ you got an O from each parent (possible) and the D Antigen (from your dad).
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Tegan
Is it possible for me as a o neg mother to pass my blood to my son and it be o positive and not negative but its still my blood
Added:
Cheryl Greene
Tegan,
Thanks for writing in.
If one parent’s blood type is O- the child’s blood type can be O+ if the other parent is A+, B+, or O+.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Monika
hiiii….if mother is having B+ blood gp and father is having A- then the second male child will be of which blood gp??
Added:
Cheryl Greene
Dear Monika,
Thanks for writing in.
Parents pass their genes down to their children, but there isn’t a set order. Each child has the same odds of getting a particular blood type as all other children in the family.
If the mother is B+ and if the father is A-, each of their children can be A+, A-, B+, B-, O+, O-, AB+ or AB-. You probably noticed that is every blood group. You are correct. This parent combination is the only one that does not eliminate any possible blood group in their children.
Sorry I wasn’t able to be more helpful,
@MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
lucille
hello i just wanna know what blood type there would be a baby if the father is b+ and the mother is also b+?
Added:
Cheryl Greene
Hi Lucille,
Thanks for writing in.
If both parents are B+, each of their children could be B+, B-, O+ or O-.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Kdee
Kind Sir,
If a mother is RH- is that the same as O-???
Also if a RH- mother and O+father had a child, what would their child blood type be???
Thank you,
Kdee
Added:
Cheryl Greene
Dear Kdee,
Thanks for writing in.
Type blood can be Rh- or Rh+, in other words, if you mother is Rh- she could be O-, A-, B- or AB-.
If the mother is Rh- and the father is O+ the child could be A+, A-, B+, B-, O+ or O-. Basically any blood type except AB+ or AB-.
I hope that is helpful.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Kdee
Thank you!
Added:
Cheryl Greene
You are most welcome.
Added:
Anonymous
Hi, I’m o+ my husband is o+ and son is o+ but people say my son does not look like him, I did an identygene paternity test to make sure he wasn’t switch and it came 9999% I don’t know what else to do, :-(
Added:
Cheryl Greene
Dear Anonymous,
Thanks for writing in.
All your blood types are consistent for a family group, but the DNA paternity test is as conclusive as you can get. 99.999% accurate is considered the gold standard for determining paternity.
If the identygene paternity test you took is legally binding there is nothing more you can do to prove that your husband is your son’s father.
When people say he doesn’t look like his father, I suggest you smile and simply say, “We both love our son very much.”
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Heather
Is it possible to have a O+ mother, a 0- father, and A+ baby?
Added:
Cheryl Greene
Hi Heather,
Thanks for writing in.
Our current understanding of genetics is that it is not possible for one parent to be O+, the other parent to be O- and their child to be A+. Two parents with type O blood can only have children with type O blood.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Priyangu
Hello Doc, my Father’s blood group is O+ And my mother’s is also O+ is it possible that my blood group is B+?, or i may be exchanged in the hospital😥
Added:
Cheryl Greene
Priyangu,
Thanks for writing in.
Our current understanding of genetics is that it is not possible for both parents to have O+ blood and their child to have B+ blood.
It is far more common for one of the three blood types to be different than thought than for kids to be exchanged in the hospital, therefore it is wise to have all your blood retested. If the tests remain the same, the next step is a DNA paternity test. are fairly inexpensive, can be ordered online, taken in the privacy of your own home, mailed in, and results received by mail. They are considered 99.999% accurate.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
jannah
Hi, i was just wondering if my blood type is A+ and my child is A+, what blood type will his father have?
Added:
Cheryl Greene
Hi Jannah,
If your blood type is A+ and if your child’s blood type is A+, his father’s blood type could be A+, A-, B+, B-, O+, O-, AB+ or AB-. As you can see, this does not rule out any blood type. There are a few combinations that don’t actually rule out any blood types, and this is one of them.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Raj
Hello
I am AB+ and my wife is B- is it possible to have a baby with O+ ..
I have read a lot of your answers and search on internet what seems to me is impossible .
Is it possible that baby have Bombay blood type (baby is O+) .
Added:
Cheryl Greene
Raj,
Thanks for writing in.
Your blood types fit the Bombay type, which doesn’t mean it is, but it could be.
The Bombay type is very rare — 0.0004% or about 4 per million in the general population. In some places such as Mumbai (which was formerly called Bombay) the occurrences can be as high as 0.01% or 1 in 10,000. The group does not fall into the ABO system and the usual tests for ABO blood show them as group O.
The Bombay blood type is usually only found in small communities where there are other people with the hh blood type. Both parents have to be h carriers, though a parent can be a carrier without actually having Bombay type blood.
I assume you’ve had repeat testing in the ABO blood system. It you get the same readings multiple times, and if you suspect your child may have the Bombay blood type talk to your doctor about a specialized test for this blood type as it does not show up using the normal ABO blood type tests.
If you are still concerned, you may want to ask your doctor about a DNA paternity test.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Castillo
Hello … if I’m B+ and my husband is A+ out baby has O+ is this normal ???
Added:
Cheryl Greene
Castillo,
Thanks for writing in.
Yes, if you are B+ and the father of your baby is A+, it’s perfectly normal for your child to be O+.
Let me know if you’d like an explanation.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Ravi
If my and my husbmd have o+ blood group then our baby have b+ blood group how it happen it is normal or rare
Added:
Cheryl Greene
Ravi,
Thanks for writing in.
Let me start by saying, it is very common for blood types to be different than they are thought and is wise to have all your blood retested.
If you have O+ blood and if the father of your baby has O+ blood, each of your children can have O+ or O- blood. If you have O+ blood and your baby has B+ blood, the baby’s father would have B+, B-, AB+ or AB- blood.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
O + and A Rh (D) +
My wife`s blood type is ‘O’ positive and mine is ‘A’ Rh (D) positive, but currently don’t know each of my children`s blood type. What are these likely to be?
Added:
Cheryl Greene
Hello,
Thanks for writing in.
If the mother of your children has type O positive (also noted O+) blood and if you have A Rh (D) positive (also noted (A+)blood each of your children could be O+, O-, A+ or A-
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
O + and A Rh (D) +
Thank you for clarifying the expected blood types for each of my my children based on my own A Rh (D) + and my wife`s O+ confirmed blood types, however it is a possibility that someone with the same blood type as me A+ or my wife O+ could be the father based on your chart? If this is a possibility how can I determine that I am the father?
Added:
Cheryl Greene
Hello again,
If there is a question about paternity, a simple DNA paternity test is the only test considered definitive. They are fairly inexpensive, can be ordered online, taken in the privacy of your own home, mailed in, and results received by mail. They are considered 99.999% accurate.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Will
Thanks again for your comments. As I currently know my wife`s blood type and my own having had these confirmed recently by my GP and not wanting to alarm each of my children by suggesting that they are tested, what form does this test, which you advise can be ordered online take? Whilst I have a suspicion, obviously I need confirmation that I am the father of each of my children for some peace of mind. It appears, if I am understanding your earlier comments correctly, that even if I knew the blood types of each of my children, surely this third party could have the same blood type as my wife or myself and therefore my concerns remain in abeyance and not confirmed or otherwise?
Added:
Cheryl Greene
Hi Will,
So sorry, my earlier comment had a link error that caused part of the test to be invisible. I’ve edited that, but basically the DNA paternity test linked to above is a simple in-home test. “The STK Home Paternity Test is delivered to your door and includes cheek swabs for gathering samples and a mailer for sending the genetic material back to the lab.” I believe it would be hard to do this test without your children knowing what you were doing.
You are correct that blood types alone can not determine paternity.
Sorry I can’t be more helpful.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Shaik Rizwana
I am b +and my husband group is b- ..wat will our children’s group.will I face any compatibility problems
Added:
Cheryl Greene
Dear Shaik,
Thanks for writing in.
If you are B+ and the father of your baby is B-, each of your children can be B+, B-, O+ or O-.
Blood type incompatibility is only an issue if the mother is Rh- and the father is Rh+.
I hope that is helpful.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Angel
I am O NEG, THEY ARE SAYING RH -. I had two children by a man that was A positive and both children are A positive. Now I’ve had another child with a man who also had o negative blood type, (same as mine) as is his father and mother but the baby I just had is O positive. I know 2 o positives can message a negative that’s how I got here, but I was told my the Dr two negatives cannot make a positive.
Added:
Cheryl Greene
Angel,
Thanks for writing in.
Our current understanding of genetics is that it is not possible for two parents who are Rh- to have a child who is Rh+. But, it’s not uncommon for blood types to be different than they are thought and is wise to have all your blood retested.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
G
Hello Dr Greene,
Can you please explain, why our daughter’s blood group is b negative when I am A1 positive and my husband is b positive?
Regards
G
Added:
Brooke
Why does my mom have blood type B+
But my half sister have A- with Rh and I have O+ ???
Added:
Cheryl Greene
Hi Brooke,
Thanks for writing in.
If your mother has B+ blood, and if your half Sister has A- blood, your half sister’s father would have A+, A-, AB+ or AB- blood.
If your mother has B+ blood and if you have O+ blood, your father could be A+, A-, B+, B-, O+ or O-, but could not be AB+ or AB-.
I hope that’s helpful.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Elizabeth F Pulliam
Is it possible for a ab-negative mother and o-positive father have a child with o-negitive blood
Added:
Cheryl Greene
Elizabeth,
Thanks for writing in.
Our current understanding of genetics is that it is not possible for one parent to be AB-, the other parent to be O+ and their child to be O-. An AB parent can only have children who are A, B or AB.
There is one exception. There is a rare blood type (0.0004% or about 4 per million in the general population) known as the Bombay Blood type. In some places such as Mumbai (which was formerly called Bombay) the occurrences can be as high as 0.01% or 1 in 10,000. This group does not fall into the ABO system and the usual tests for ABO blood show them as group O.
The Bombay blood type is usually only found in small communities where there are other people with the hh blood type. Both parents have to be h carriers, though a parent can be a carrier without actually having Bombay type blood.
If you suspect your child may have the Bombay blood type talk to your doctor about a specialized test for this blood type as it does not show up using the normal ABO blood type tests.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Gianna Marie
I am 0+ and my partner is O-
Our daughter has B+
How is this possible ?
Added:
Cheryl Greene
Hi Gianna,
Thanks for writing in.
Our current understanding of genetics is that it is not possible for two parents with type O blood to have a child with type B blood. Two parents with type O blood can only have children with type O blood.
It is wise to have all your blood re-tested. It’s not uncommon for blood types to be different than they are thought.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Raj
Hi i have a newborn daughter my blood is a- and my husband is ab+ and our daughter is o- is this possible or not . I m very confused i just read ur info here . I. Very scared ??? Please tell me this is possible or not ??
Added:
Cheryl Greene
Raj,
Thanks so much for writing in.
There is a very rare blood type (0.0004% or about 4 per million in the general population) known as the Bombay Blood type. In some places such as Mumbai (which was formerly called Bombay) the occurrences can be as high as 0.01% or 1 in 10,000. This group does not fall into the ABO system and the usual tests for ABO blood show them as group O, but they are actually hh.
The Bombay blood type is usually only found in small communities where there are other people with the hh blood type. Both parents have to be h carriers, though a parent can be a carrier without actually having Bombay type blood.
If you suspect your child may have the Bombay blood type talk to your doctor about a specialized test for this blood type as it does not show up using the normal ABO blood type tests.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Tessa
My mother has O+ blood and insists my father as A+ blood. Everything I’ve read says that I cannot have B- blood. However, I know that I do because I had to have the shot after I had my daughter and I also had to have 4 units of blood given to me 4 years ago. Am I correct in thinking that this is not possible? I’m not thinking infidelity with my parents, but this is a different situation. Thanks in advance for your answer to my question.
Added:
Cheryl Greene
Tessa,
Thanks for writing in.
If both your parents are Rh+, you can still be Rh-. The issue here is, according to our best understanding of the science, if one parent has type O blood and the other has type A blood, their child can not have type B blood. For you to have type B blood one of your parents must have type B or type AB blood. In addition, if you have any full siblings who are type O, your mutual parents can not have type AB blood.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Roger
What combination of blood types and RH factor would produce 2 male siblings, one with B+ and one with O-
Thanks
Added:
Cheryl Greene
Hi Roger,
Great question.
If two full siblings are B+ and O- their parents could be:
B+ and O-
B- and O+
B+ and O+
B+ and B-
B+ and B+
B+ and A-
B- and A+
B+ and A+
Let me know if you’d like an explanation.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Y.
Reading the article I became confused. My twin sister and I are both B-. When I asked my parents my Dad says he is A+ and my Mom is O+. Two of my brothers are A+ and the third is O-. How did we end up with our blood type?
Added:
Cheryl Greene
Dear Y,
Thanks for writing in.
You are correct that these blood types don’t all make sense. Perhaps one of your parents’ blood type is different than you think. That is not at all uncommon. For instance if your dad was AB+ instead of A+, all four kids could be full siblings.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Maris
Hi I’m Maris
After my menstration I have sleep with my boyfriend for two weeks and one day I drunk and there something happen to me with my ex boyfriend if I’m getting pregnant who will be the father of my baby? The first one or the 2nd one?
Added:
Pam
If I am O+ and I have one daughter that is B+ and another daughter that is O+ and another daughter that is O- what could my husbands blood type be?
Thanks!
Added:
Cheryl Greene
Hi Pam,
Thanks for writing in.
If you are O+ and you have one daughter that is B+, one who is O+ and one who is O-, if they all have the same father he could be B+, B-, AB+ or AB-.
Let me know if you’d like an explanation.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
anne
my husband is type A and i am type ab+ and my son is A+ is that match ? because i am worry why my son is A+ that his father is type A
Added:
Cheryl Greene
Hi Anne,
Thanks for writing in.
If you are type AB+ and if your son is type A+, his father could be type A+, A-, B+, B-, O+, O-, AB+ or AB-. This must sound very confusing, but here’s what we know…
Each person gets ONE allele for type (A, B, & O are the common types. There are some very rare types, but don’t come into play here) from EACH parent.
If you are type AB and if you son is A+, he could have only gotten an A from you. He does not have a B.
If the above holds, they his father contributed either a A or an O, because what we label type A is either AA or AO.
In order for a person to be Rh+ he or she had to get the D antigen from one parent and if you are Rh+, then your son’s father could be positive or negative.
I hope this all makes sense.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Nicole
My husband is O+ and I am AB+ how come our new born is AB+ too?
Added:
Cheryl Greene
Hi Nicole,
Thanks for writing in.
Our current understanding of genetics is that it is not possible for one parent to be AB+, the other parent to be O+ and their child to be AB+. Their child can only be A+, A-, B+ or B-.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Sweets
Confused…….because this is the same situation I am in. I am ab+ and the father is o+ and our son is ab+ and I know that I only conceived with my sons father there was no one before him. So how is my son ab+ if this can not be.
Added:
Cheryl Greene
Dear Sweets,
Thanks for writing in.
There are a few very rare blood types that don’t show up properly on blood tests. In addition, blood tests can be in error with either a sample issue or a reporting issue.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought. If the tests still show blood types that are considered “impossible”, you may want to talk to your doctor about a specialized test for Bombay blood type. He or she will likely tell you the test can only be done after a DNA paternity test. That test is inexpensive, but the Bombay blood type test may not be.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Anonimous
I don’t know my husbands blood type. But I have 3 kids 0+ and one
B+ (which I am sure are his) but the last one I am not sure is his. and he is A+ is it possible is not his? :(
Added:
Cheryl Greene
Dear Anonymous,
Thanks for writing in.
If you are O+ and your husband is A+, the two of you can not have a child that is B+. If you are A+ and your husband is B+ you could have children who are O+, B+ and A+.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
If there is a question, a is the only test considered definitive. They are fairly inexpensive, can be ordered online, taken in the privacy of your own home, mailed in, and results received by mail. They are considered 99.999% accurate.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Lance
Hi doc. can i ask question?
If am positive O and my wife is positive O.. could it be possible that our child would be positive B? Thanks
Added:
Cheryl Greene
Lance,
Thanks for writing in.
Our current understanding of genetics is that it is not possible for two O+ parents to have a child who is B+. Two O+ parents can only have children who are O+ or O-.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
If there is a question, a is the only test considered definitive. They are fairly inexpensive, can be ordered online, taken in the privacy of your own home, mailed in, and results received by mail. They are considered 99.999% accurate.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
RAJESH
Hello Doctor,
I’m RAJESH
My father and my mother blood group is O+ve and my elder brother also O+ve and mine is O-ve , is there any problem with my genetic system?
Added:
Cheryl Greene
Rajesh,
Great question. You should know it’s perfectly normal for two O+ parents to have an O- child.
There may be other, unrelated, genetic issues, but this blood type is normal.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Dinesh
My group is A+ and my wife blood group is also A+ what is possibilities of child group
Added:
Cheryl Greene
Hi Dinesh,
If your blood type is A+ and the mother of your child’s blood type is A+, each of your children could be A+, A-, O+ or O-.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
A B Bhat
How A-ve will be possible for child if both parents are A+ve.
Plz clear me that Sir.
Added:
Cheryl Greene
Hello and thanks for writing in.
It is perfectly normal for two A+ parents to have a child that is A-. The + (or Rh+) and – (or Rh-) refer to the presence or absence of the D Antigen. At least one parent must have the D Antigen present for a child to be Rh+, but even if both parents have the D Antigen present, it is very normal for neither of them to pass it down to their child.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Elizabeth G
Hi, I was wondering if I’m O- and my mother is B+ what could my dads blood type be?
Added:
Cheryl Greene
Hi Elizabeth,
Great question. As it turns out, if you’re O- and if your mother is B+, your father could be O+, O-, A+, A-, B+, or B-. He could not be AB+ or AB-.
Let me know if you’d like an explanation.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
chitra
Hi, is it possible to get a child with blood group o+ while the parents is ab+ and O+
Added:
Cheryl Greene
Chitra,
Thanks for writing in.
Our current understanding of genetics is that it is not possible for one parent to be AB+, the other parent to be O+ and their child to be O+. An AB parent can only have children who are A, B or AB.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Halie
If my boyfriend is A + and I am O – what will our babies blood type be?
Added:
Cheryl Greene
Hi Halie,
Thanks for writing in.
If you are O- and if the father of your baby is A+, each of your children could be A+, A-, O+ or O-.
Let me know if you’d like an explanation.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Craig
My group is ab possitive and wifes group b possitive what is the possibilities of childs group.
Added:
Cheryl Greene
Craig,
Thanks for writing in.
If your blood type is AB+ and the mother of your children’s blood type is B+, each of your children could be AB+, AB-, B+ or B-.
If you would like an explanation, please let me know.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Anonymous
Hi doctor, I’m RH Negative (O Negative) Our son is A positive and I Don’t remember but I thought our daughter was B positive or AB positive I can’t remember! We don’t know what my husbands blood type is! Could you please tell me what his blood type could be based on our children?
Added:
Cheryl Greene
Anonymous,
Thanks for writing in.
If you are O-, your child can not be AB+ or AB-. Let’s assume you daughter is B+ (but remember, unless you’ve had a confirmed blood type, you may not be O-, so this is all an exercise in “what-if’s”). But if you’re O- and if you have one child who is A+ and one child who is B+, their father would have to be AB+.
If you’re O- you can only pass down an O and a -. That means each of your children had to get the + from their father and had to get either the A or the B from their father.
Again, this is just a “what-if” until you are sure of your blood type and each of your children’s blood type.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Misty
I am O+ and my husband is O-. What blood type would our children be?
Added:
Cheryl Greene
Hi Misty,
Thanks for writing in.
If you are O+ and the father of your baby is O-, the children can only be O+ or O-.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Ashley.
So my mom is o- and my dad is o+ and my twin sister and I are A+ does that mean our dad isn’t our real dad?
Added:
Cheryl Greene
Hi Ashley,
Thanks for writing in.
Our current understanding of genetics is that it is not possible for one parent to be O-, the other parent to be O+ and their child to be A+. Two type O parents can only have children who are type O.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Renée
Hi Dr, My blood type is o+ can my father be AB blood type. I don’t know my mother’s blood type.
Added:
Cheryl Greene
Renée,
Thanks for writing in.
Our current understanding of genetics is that it is not possible for one parent to be AB have a child who has type O blood. An AB parent can only have children who are A, B or AB.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
William
Hi , my blood is O- I want to knw if it’s true that O- are likely to give birth to twins
Added:
Pat
Hello Dr Greene,
My mom is O+ and we believe that my biological father was AB. We are not sure about the RH. I have a sister that is AB+ another sister is O+ and I am O-. I also know that my mom has a sister that is O-. So my question is, are my sisters and I full sisters or do I have a different father?
Added:
Pat
I apologize, my sisters are B+ and O+ and we are unsure of our father’s blood type.
Added:
Cheryl Greene
Pat,
Thanks for writing in.
If your mother has type O blood, she can not have a child with type AB blood no matter what the father’s blood type. Additionally, if your father had type AB blood, he can not have children with type O blood.
From your question it sounds like your father is no longer living. That complicates things a bit, but it would be wise to have all your blood types retested. For instance if one of your parents is type A and the other is type B, all of the blood types of the children you mentioned are possible.
I hope that’s helpful.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Michelle
My mother is A+ and my father O+ I’m O- is this possible?
Added:
Alexandra Carmichael
Hi Michelle,
Yes, this is possible.
Hope that helps!
Alexandra (caring helper at drgreene.com, not a doctor)
Added:
Pn
Hello Dr.
My Wife’s Blood group is O Positive and My Blood Group is B Positive, My Daughters Blood group is seen as AB Negative, Is this possible?
Pn
Added:
Alexandra Carmichael
Hi Pn,
Thanks for writing in! Our current understanding of genetics is that it is not possible for one parent to be O, the other parent to be B and their child to be AB. It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
Hope that helps!
Alexandra (caring helper at drgreene.com, not a doctor)
Added:
T
My mums B- and my dad is O- what is my blood type?
Added:
Alexandra Carmichael
You should be either B- or O-, if your parents’ blood types are correct.
Hope that helps!
Alexandra (caring helper at drgreene.com, not a doctor)
Added:
Tara
I am A positive and my husband is A positive can my child be A positive?
Added:
Alexandra Carmichael
Hi Tara,
Yes, this is possible!
Hope that helps!
Alexandra (caring helper at drgreene.com, not a doctor)
Added:
Pat
Hello,
I just had my blood retested and came back O+, I have been told my husband is A (not sure + or -), was told my daughter (at her birth) is AB (?) and son is B (?) how can this be?
Thank you……
Added:
Alexandra Carmichael
Hi Pat!
Hmm that doesn’t sound possible based on our current understanding of genetics. Probably a good idea to get your husband and children retested too.
Hope that helps!
Alexandra (caring helper at drgreene.com, not a doctor)
Added:
Pat
OK, just got word from daughter saying she gave blood recently and is O-(she was told), NOT AB as the Dr. told me back when she was born. How could they have made such an error? They even stressed how rare her type was!
Added:
Jeryll
Hi,
I have blood type o and my wife is blood type o but my new born baby is AB. Is that possible?
Added:
Alexandra Carmichael
Hi Jeryll,
Our current understanding of genetics is that it is not possible for both parents to be O and their child to be AB.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
Hope that helps!
Alexandra (caring helper at drgreene.com, not a doctor)
Added:
Vicki
My mother is a o- rh factor my father is b+ what blood type should I be
Added:
Alexandra Carmichael
Hi Vicki,
Thanks for writing in! You would be O or B, + or -.
Hope that helps!
Alexandra (caring helper at drgreene.com, not a doctor)
Added:
Emma
Hello, in desperate need off your help! So my partner is from Pakistan we have been having a really hard time with his family and split up I stupidly slept with another guy, who is English.. I’m now pregnant is there anyway by bloods I can tell who’s baby this will be? (My child us unborn) please help it’s sending me insane.
Added:
ASIM CHANDA
if child have A and mom have AB , then what is the possible blood group pf dad??
is it….all i.e A,B, AB and O??
Added:
Alexandra Carmichael
Hi Asim,
Thanks for writing in! Yes, given your scenario, the dad could be A, B, AB, or O, and still have a child who is A.
Hope that helps!
Alexandra (caring helper at drgreene.com, not a doctor)
Added:
Olivia
Hello. My mom has O+ blood type and my dad has B+ blood type so I was wondering what kind of blood type I most likely have
Added:
Alexandra Carmichael
Hi Olivia!
Given your parents’ blood types, you are most likely O or B, and you could be + or – depending on whether your parents carry the Rh- type as well as the Rh+.
To be sure, you could just get a quick blood test done.
Hope that helps!
Alexandra (caring helper at drgreene.com, not a doctor)
Added:
Tere
Hi Dr. Green.
I am a teacher, and at school, there was a huuuuuge controversy. When the science 7th grade teacher showed a blood paternity chart (exactly as the one that you present on this site), a student almost freaks out because she is AB, and her mom and dad are A.
Then, parents came wanting to sue the school for that (fortunately they finally didn’t) but still the dad made a terrible scene accusing his wife of infidelity here at school.
Are there any exemptions that could possibly be: mom A + dad A = child AB?
Added:
Alexandra Carmichael
Hi Tere,
Thanks so much for writing in! How stressful for your student to have her parents so upset over the blood paternity chart.
Our current understanding of genetics is that it is not possible for both parents to be A and their child to be AB. It is wise to have all their blood retested before jumping to conclusions. It’s not uncommon for blood types to be different than they are thought.
Hope that helps!
Alexandra (caring helper at drgreene.com, not a doctor)
Added:
Tere
Thanks Alexandra.
Added:
Linda
My mom was 0- my dad is 0+ how can I be a+
Added:
Alexandra Carmichael
Hi Linda,
Thanks so much for writing in! Our current understanding of genetics is that it is not possible for both parents to be O and a child to be A.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
Hope that helps!
Alexandra (caring helper at drgreene.com, not a doctor)
Added:
Samantha
I’m a+ and my boyfriend is o positive my son is a+ is this my boyfriends son?
Added:
Alexandra Carmichael
Hi Samantha,
Thanks for writing in! It’s definitely possible that an A+ mom and O+ dad can have an A+ baby, yes.
Hope that helps!
Alexandra (caring helper at drgreene.com, not a doctor)
Added:
Blanca
is it possible to find out my husbands blood type with my kids and my blood type? I am o+ and my kids are o+ and b +
Added:
Cheryl Greene
Hi Blanca,
If you are O+ and your if your kids are O+ and B+, he is either B+, B-, AB+ or AB-. You can’t get closer than that without having his blood type tested.
Hope that helps,
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Akriti
my blood group is A+, my dad’s B+. what would be my mom’s blood group?
Added:
Joe
Your mom must be A or AB. She cannot be B or O if you’re A and your dad is B.
Added:
Twinkle
I am B Positive my daughter is 0 Negative
Added:
Andres
My mother is O- and my father is B+. My blood type is B-. Is he my father?
Added:
Alexandra Carmichael
Hi Andres,
Thanks for writing! It is possible for an O- mother and a B+ father to have a B- child, yes.
Hope that helps!
Alexandra (caring helper at drgreene.com, not a doctor)
Added:
Jeamy
I’m O pos. My husband is B pos. And our baby is AB how is that possible???
Added:
Alexandra Carmichael
Hi Jeamy,
Thanks so much for writing in! Our current understanding of genetics is that it is not possible for one parent to be O+, the other parent to be B+ and their child to be AB. One parent would need to be A or AB to have an AB child.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
Hope that helps!
Alexandra (caring helper at drgreene.com, not a doctor)
Added:
K
Both parents are o but son is b reh+
Added:
Aditi
My blood group is B negative but my parents blood group is B positive. Is this possible ??????????????????????????????????????
Added:
Alexandra Carmichael
Hi Aditi,
Thanks so much for writing in! Our current understanding of genetics is that yes, if your parents each have both the + and – versions of the Rh gene, you could end up negative. Dr. Greene explains it here – http://www.drgreene.com/qa-articles/blood-types-101-introduction-abo-blood-types-rh-system/
Hope that helps!
Alexandra (caring helper at drgreene.com, not a doctor)
Added:
Mayur
Dear sir my blood group is o positive and my wife blood group is o negative and my child is b positive it is possible
Added:
Alexandra Carmichael
Hi Mayur,
Thanks so much for writing in! Our current understanding of genetics is that it is not possible for both parents to be O and the child to be B.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
Hope that helps!
Alexandra (caring helper at drgreene.com, not a doctor)
Added:
Bianca
Hi doc,
U sau it is impossible for 2 O parents to have an A baby. . . i think its not true reasons being:
1) I have only ever slept with 1 man
2) my child looks too much like me to be switched ay birth
3) my dad is A type. . .
so how can my son be A then if its “impossible”?
Added:
Alexandra Carmichael
Hi Bianca,
Thanks for writing in! Our current understanding of genetics is that it is not possible for two O parents to have anything other than O children.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
Hope that helps!
Alexandra (caring helper at drgreene.com, not a doctor)
Added:
Sandy
It is practically and scientifically not possible to have a B+ baby when both parents are O blood group.
Added:
Oshin
Hello sir
My blood group is o+ and my husband’s is b+ but my son’s blood group is a+.according to the chart it’s impossible.does it happen in rare case?
Thank you.
Added:
Cheryl Greene
Oshin,
ur current understanding of genetics is that it is not possible for one parent to have O+ blood, the other parent to be B+ and their child to be A+.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
A.M.S
I am A-, during my pregnancies I had to have injections of Rogham. I understand the reasoning behind that, because if the father was + the affects it would have on me. Now, my question is this. My mother is also A-, and again I am A-, which would mean my father couldn’t be a + correct? Because if he was then that would of been passed on to me? What would his blood type have to be for me to be A- coming from a mother that is also A-?
Added:
Alexandra Carmichael
Hi Amy,
Thanks so much for writing in! It’s a great question. Based on what Dr. Greene wrote here (http://www.drgreene.com/understanding-blood-types/), your father could have been Rh- or Rh+ (technically — or +-, so he could pass the – on to you). Feel free to read it for yourself as well.
I hope that helps! Best wishes,
Alexandra (caring helper at drgreene.com, but not a doctor)
Added:
lena
I am AB +, one son is A+ and one son is B+. Their father is O. Could he be + or – ?
Added:
Alexandra Carmichael
Hi Lena,
Thanks so much for writing in! Great question. Based on Dr. Greene’s article here (http://www.drgreene.com/understanding-blood-types/), it sounds like yes, the father can be + or -. Feel free to read it for yourself as well.
I hope that helps! Best wishes,
Alexandra (caring helper at drgreene.com, but not a doctor)
Added:
Concerned
My mom is AB- and I am A+ what is my Father’s blood type.
Added:
Cheryl Greene
Dear Concerned,
If your mom is AB- and if you are A+, your father can be A+, B+ or O+.
Let me know if you’d like more explanation.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Jade
I’m an Ab+ and my husband is B+.
Which blood group will our baby belong?
Added:
Cheryl Greene
Hi Jade,
If you are AB+ and your child’s father is B+, each of your children could be AB+, AB-, B+, B-, A+, or A-.
Please let me know if you’d like an explanation.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Eloise
My parents are both 0+ and im 0 -. …
Added:
Cheryl Greene
Eloise,
I can see how you’d be concerned, but it is normal for two O+ parents to have an O+ or an O- child. You can rest assured.
Let me know if you’d like an explanation.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Gabrielle
Both our children are o negative as am I, what blood type is my husband.
Does blood types affect our children’s gender? We have two sons
Added:
Cheryl Greene
Gabrielle,
If you are O- and your children are O-, their father could be O+, O-, A+, A-, B+, B-. He could not be AB+ or AB-.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Ayush Agarwal
Is it necessary that bombay blood type child form only in inbreeding ?
Added:
Cheryl Greene
Ayush,
The Bombay Blood type is rare and is only found is some people. Both parents do not have to be related to have the hh allele, but it is more likely in some groups than in others.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Sunflower
I am 0 positive my 2 girls are also and my one daughter is a- what could there dad be
Added:
Cheryl Greene
Sunflower,
If you are O+ and one of your children is A-, her father could be A+, A-, AB+ or AB-.
Let me know if you’d like more explanation.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Ayush Agarwal
Sir both me & my brother have O+ blood group while my father has blood group O+ while mother has blood group AB+.
They both are my biological parents. then how it is possible?As according to your above chart its impossible to have O+ blood group?
Added:
Cheryl Greene
Ayush,
There is a very rare blood type (0.0004% or about 4 per million in the general population) known as the Bombay Blood type. In some places such as Mumbai (which was formerly called Bombay) the occurrences can be as high as 0.01% or 1 in 10,000. This group does not fall into the ABO system and the usual tests for ABO blood show them as group O.
The Bombay blood type is usually only found in small communities where there are other people with the hh blood type. Both parents have to be h carriers, though a parent can be a carrier without actually having Bombay type blood.
If you suspect you may have the Bombay blood type talk to your doctor about a specialized test for this blood type as it does not show up using the normal ABO blood type tests.
DNA paternity tests are still accurate (99.999%) with Bombay type blood and are considered the only accurate test for paternity.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Luwe
Hi my blood type is B+ my husband is O ,but i dont know the Rh,what would our child might have blood type
Added:
Cheryl Greene
Hi Luwe,
If you have type O (Rh+ or Rh-) and your baby’s father has B+ blood, your child could be B+, B-, O+ or O-.
Let me know if you’d like further explanation.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Minda Vazquez
My husband has always wondered, if he is O – and I am A-, all our children are A- , why aren’t any of our children O-
Added:
Cheryl Greene
Hi Minda,
If both you and your children’s father are Rh-, all your children will be Rh-.
Statistically, if you are A and your children’s father is O, 25% of your children would be type O. In other words each child has a 1 in 4 chance of being A-, which means each child has a 75% chance of being A-. Theoretically, if you had four children, one would be O-, but these odds really only play out over a large sample size. i.e. if 1,000 children had parents who were O- and A-, 250 of them would be O-, but the first 750 could easily be A-.
Does that make sense to you?
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
cortney johnson
my name is cortney, hi, i have a question,
my blood is A- my husbands is AB+ and our baby is AB-
is this a rare thing
Added:
Cheryl Greene
Cortney,
If one parent is A- and the other is AB+, there is a 37.5% chance their child will have type AB blood and a 25% chance the child will be Rh-.
I hope that answers your question.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Cortney
Iam A- the father is Ab+
Our baby is AB- why is this ?
Added:
Cheryl Greene
Cortney,
Blood types are comprised of two alleles. The most common (by far) are A, B, and O. Each person also has the presence of D antigen (which we call Rh+) or the absence of D antigen (which we call Rh-).
If a person has type A- blood he or she has at least one A allele (this can be AA or AO) and does not have the presence of D antigen.
If a person has type AB+ blood he or she has one A allele and one B allele and does have the presence of D antigen.
In the example you provide the A-, could be AA- – or AO – -. The AB+ parent could only be AB+-.
The child would have gotten an A from the A- parent and a B from the AB+ parent and a negative from each parent.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Sarah
I am A- , my mom is O+. Could my dad be B+?
Added:
Cheryl Greene
Sarah,
Our current understanding of genetics is that it is not possible for one parent to be A-, the other parent to be O+ and a child their child to be B+. These two parents could only have children who are O+, O-, A+ or A-.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Vela
I am B+. My mother is O (I’m not sure the RH). What would that make my father? He has to be B, right?
Added:
Cheryl Greene
Vela,
If your mother is O and you are B, your father is either B or AB. If you are B+ at least one of your parents is Rh+. They could also both be Rh+, but they can not both be Rh-.
Let me know if you’d like an explanation.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Dorcas Jones
What does ob positive means
And what if me and husband and four children has the same
Added:
annie
my husband is a positive, me is b positive, and my child is b positive too.. is it right?
Added:
Cheryl Greene
Hi Annie,
If one parent is A+ and the other parent is B+, their child can be B+.
If you’d like an explanation, please let me know.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Michelle
Hi sorry I’m the same as this . My boyfriend is panicking over blood group about some not being good together when having children X couple you please explain a bit
Thank you
Added:
Cheryl Greene
Michelle,
If the mother is Rh- and the father is Rh+, there can be a problem for pregnancies after the first. Dr. Greene wrote about this –> How To Determine and Manage Rh Incompatibility. Do you know your blood types?
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Amy
Hi,
im doing genetics at college at the moment (ive missed a lot of biology)
Weve been given problem solving questions and we are told to use the hybrid grid to work out answers- I wanted to check my answer to see if I get it right…
In the question the parents blood types are AB and O what possible blood types could the children be born with? We have been told that it is not A..why would that be?
any help would be much appreciated,
Thanks
Added:
Cheryl Greene
Hi Amy,
I’m afraid I can’t help. There are some very rare blood types that fall outside the ABO system, but if the parents are AB and O, each of their children could be A or B, but not AB or O.
Any one else with a clue here?
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Deepmala
Hiii.
My blood group is B+ and my husband is O+ and my baby is AB+ how its possible
Added:
Cheryl Greene
Deepmala,
Our current understanding of genetics is that it is not possible for one parent to be B+, the other parent to be O+ and a child their child to be AB+.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Michael
Both my parents are O+, my older brother is B+ my younger brother is O+, I am AB+. How is this possible? We tested 3 times.
Added:
Cheryl Greene
Michael,
Our current understanding of genetics is that it is not possible for two parents to be O+, and their children to be B+ and AB+.
Have you discussed this with your parents? If you’ve had your blood types retested, perhaps it’s time to have DNA paternity testing done.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Cathy
My parents both were O+ . My sister and I are both A + how is that possible?
Added:
Cheryl Greene
Cathy,
Our current understanding of genetics is that it is not possible for both parents to be O+ and their child to be A+. Two O+ parents can only have children who are O+ or O-.
It is wise to have all your blood re-tested. It’s not uncommon for blood types to be different than they are thought.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
alycia
It’s genetic mutation…that’s how..it’s rare but it can happen. O blood type used to be A blood type..it’s missing one allele. During the genetic code (inception of a baby) if that one allele is placed back then the O blood would return to an A blood type.
Added:
Kathy L Gladson
If my mom is RH o – and my dad is a – is it possible for my brother to be a+ when my two sisters are a- and I’m RH a-
Added:
Cheryl Greene
Kathy,
Our current understanding of genetics is that it is not possible for one parent to be O- and the other to be A- and their child to be A+. Two Rh- parents can only have children who are Rh-.
It is wise to have all your blood re-tested. It’s not uncommon for blood types to be different than they are thought.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Anna
My husband is o- and my son is o+. What would that make me the mom?
Added:
Cheryl Greene
Anna,
If your son is O+ and if his father is O- you could be O+, A+, or B+.
Let me know if you’d like an explanation.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Tammy
Me, my sister and a niece from a deceased sister are O-negative. What are the odds that my parents were both Rh negative?
Added:
tieba
my mom is o postive and dad is ab what would my blood type would be
Added:
Cheryl Greene
Tieba,
If your mom is O+ and your dad is AB, you could be A+, A-, B+ or B-.
Let me know if you’d like an explanation.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Jessica
Hey there my dad is A+ and my mom is A-. I’m curious about what my blood type might be. Thanks!!
Added:
Cheryl Greene
Hi Jessica,
If your dad is A+ and your mom is A- you could be A+, A-, O+ or O-.
Let me know if you’d like an explanation.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Liline
Hi Doc, I’m A+ and my three kids are A+, what do you think my husband blood type might be if all our three kids are A+ ?
Added:
Dineshwaren
Hello I am Dineshwaren ,my father blood group is O and my mother is A,what is my possible blood groups and the siblings can have same blood group?
Added:
Cheryl Greene
Dineshwaren,
If your father is blood group O and your mother is blood group A, each of their children can be A or O.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Ankur
My blood type is A+ and my wife is AB-. So is there any problem during her pregnancy? What is the possible blood group of our children? Please let me know.
Added:
Jonathan
Hello doctor I was wondering is I’m o+ and my girlfriend o+ can our baby be born with complications
Added:
Cheryl Greene
Jonathan,
If one parent has O+ blood and the other has O+ blood, the baby won’t have issues with blood type incompatibility. There can be complications for other reasons, but not from blood types.
I hope that helps, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Carol Lockridge
Hello, My mother once told me she was AB+. I never physically met my dad but I think he was an O. My blood type is O+. Im confused, am I supposed to be type O?
Added:
Yaszher A. Laborte
Hello doc I have a question of my mother blood type is A/B and my father is type B . What are the possible blood type of their offspring?
Added:
Cheryl Greene
Yaszher,
If your mother is AB and your father is B, each of their children could be AB, B or A.
Let me know if you’d like an explanation.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Heaven
Hello, my mom’s father is O- and my mom is ab+
I do not know my grandmother’s blood type. My mother is convinced that her father may not actually be her real father because he is O-.
Is her assumption logical?
Added:
Cheryl Greene
Heaven,
If your mom is AB+ neither of her biological parents can be O-. But it’s not uncommon for blood types to be different than remembered. Before jumping to any conclusion it would be wise have blood types retested.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Nat
Hi, I’m A- and I’ve just found my Dad, I’ve never met, his blood type is B+ I’m pretty sure Mum was A or A+ is that possible?
Added:
Cheryl Greene
Nat,
Yes it is possible for a type A- or A+ mother and a type B+ father to have a child who is A-.
If you’d like an explanation, let me know.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
gaby
Again I ask i am A- the father is O+ my son is A- is that possible?
Added:
Cheryl Greene
Gaby,
If the mother is A- and the father is O+, their child can be A-.
Sorry if I missed an earlier question.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
GARIMA
Hi,
A father with B+ve and a mother with A+ve can have a child of AB-ve
Added:
Cheryl Greene
Garima,
Yes, it is possible for a father with B+ blood and a mother is A+ blood to have a child that is AB-. If you’d like an explanation, please let me know.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Fredi
If i am A- and my father A+ what should my mother be??
Added:
Cheryl Greene
Fredi,
If you are A- and if your father is A+, your mother could be O+, O-, A+, A-, B+, B-, AB+, or AB-. In other words, this is one of those combinations that doesn’t rule out your mother being any blood type.
If you’d like an explanation, please let me know.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Holly
Hello if a mans bloods type is O- and the mothers type is B+ is it possible for the baby to have A- blood type?
Added:
Cheryl Greene
Hi Holly,
It is not possible for a mother to have B+ blood, her baby to have A- blood and the father to have O- blood.
If the mother’s blood is B+ and the baby’s blood is A-, the father is A+, A-, AB+ or AB-.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Ruprekha waghmare
Ruprekha
If mother is B positive and father is O positive.It is possible child have A positive blood group
Added:
Gorge
My wife is 0- our son is O- an Ather possible father to my son is O- could he be the father ?
Added:
Cheryl Greene
Gorge,
If your wife is O- and her child is O-, the father could be O+, O-, A+, A-, B+, or B-.
If there is a question about who the biological father is, a is the only test considered definitive. They are fairly inexpensive, can be ordered online, taken in the privacy of your own home, mailed in, and results received by mail. They are considered 99.999% accurate.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
James
I’m curious what happens if two ab- people have a child (I heard it would cause problems)
Added:
Cheryl Greene
James,
I am unaware of any special risk for two type AB- people having a child. Perhaps you’re thinking about an Rh- mother and an Rh+ father. There is an incompatibility issue with that combination.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Scotty stiltner
My blood type is abpositive, my wife is o negative,. What would our son’s be?
Added:
Cheryl Greene
Hi Scotty,
If the dad is AB+ and the mother is O-, each of their children could be A+, A-, B+ or B-. No children can be AB+, AB-, O+ or O-.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Hector F. GarzaMata
Hi! My blood type is A- But my father had O+ and my mother was A+ .. and out 8 siblings only a sister has O-, all others are positives. Is it possible that we (my sister and I) inherited rh negative gene from paternal grandmother who was O-? or that can`t be?
On my children, two came with A- and O- and one with my wife´s type A+.
Added:
Gary
My blood group is 0+ my wife is 0+
She slept with a guy that is B+
The child is born 0+
What are the chances that this is his kid?
Added:
Cheryl Greene
Gary,
Statistically, there is a 100% chance that a mother with O+ blood and a father with O+ blood would have a child with type O blood and a 93.75% chance the child would have Rh+ blood.
Statistically, there is a 25% chance that a mother with O+ blood and a father with B+ blood would have a child with type O blood and a 93.75% chance the child would have Rh+ blood.
If there is a question about who the biological father of the baby is, a is the only test considered definitive. They are fairly inexpensive, can be ordered online, taken in the privacy of your own home, mailed in, and results received by mail. They are considered 99.999% accurate.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Shreejita Mitra
Parents blood type o+ and their 1st child’s blood type a+…how is it possible?????
Added:
Cheryl Greene
Hi Shreejita,
If both parents are O+, they can not have a child who is A+. It is possible that one of the three types is different than thought. Re-testing is the best next step.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Shreejita Mitra
Parents blood type o+ and their 1st child’s blood type a+…how is it possible?????
Added:
Cheryl Greene
Shreejita,
If both parents have O+ blood, each of their children will be O+ or O-. They can not have a child with A+ blood.
It is common for blood types to be different than thought. The next step is to re-test both parents’ and baby’s blood types.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Leslie Berry
Hi, I’m a positive and my husband is O negative. Was curious if this could cause an incompatibility in my pregnancy. I have been experiencing bleeding.
Thank you
Added:
Cheryl Greene
Leslie,
I’m so sorry to hear you’re having difficulties. I hope you’ve been in touch with your Ob about this.
The concerns over blood type incompatibility are only if the mother is Rh- and the father is Rh+, so this is not an issue for you.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Babe
So what would a baby of that combination have? I mean A+ mother and O- father
Added:
Alexandra Carmichael
Hi Babe,
If one parent is A and the other parent is O, our current understanding of genetics is that any children can only be A or O, but they could be + or -.
Hope that helps!
Alexandra (caring helper at drgreene.com, not a doctor)
Added:
Neeshu
Hi. I am A+ and my wife is AB+ we had a daughter with B+ blood group. Is it possible to have different blood group of children apart from their parents? Please explain if possible isn’t their any medical complications in such children? As my daughter is suffering from many problems since she was born I am confused. Please help and advice.
Added:
Cheryl Greene
Neeshu,
Yes, it is possible for the father to be A+ and the mother to be AB+ and the child is B+. I don’t know of any medical conditions associated with this combination.
If you’d like further explanation, just let me know.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Ker
My blood type is O+ while my wife’s type is AB+. How come our daughter’s blood type become O+. It was in the “impossible” list. Can I get more explanation? Can she fall in to the so called “bombay” blood group?
Added:
Cheryl Greene
Ker,
If one parent is AB and the child is O, an explanation is the Bombay Blood type. The typical A, B, O blood tests read the hh type (Bombay) as O.
You can ask your doctor to help you find a lab that can test for the Bombay blood type. It’s very rare and not many labs can run the test, but it’s valuable information to have. Individuals with Bombay blood type can not receive transfusions from anyone with A, B, O or AB blood types.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Anna
Hello,
I’m AB- I do not know my parent’s blood type but am concerned because my mom doesn’t recall doing anything in the late 1960’s or early 1970s when she was pregnant with either my sister or I. I had to do the shots when I was pregnant because I was AB- (luckily it didn’t matter because my child is AB-).
My sister is Type O.
Is this possible that my sister type O and I’m AB- and we have the same parents?
Added:
Cheryl Greene
Anna,
Yes, it is possible for one sibling to be AB and the other to be type O. If your parents are type A and B, they could have children who are AB, A, B, or O.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
gkpl
I was O positive in childhood but now iam A positive.My parents are O positive iam really confused,is there any rare chance?
Added:
sanjay
Sanju
Hay
My blood group is b+ve and my wife a+ve my daughter is b-ve. Is it possible.
Added:
Cheryl Greene
Sanjay,
Yes, if you are B+ and your wife is A+, your child could be B-. This is perfectly normal.
If you’d like an explanation, please let me know.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Monika
Hi doctor, My husband and I are same type O+, what would my baby be? Thanks you so much
Added:
Cheryl Greene
Monika,
If both parents are O+, each of their children could be O+ or O-.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Darla
My father is AB- and my mother was B+, yet I am Type O-.
My husband is B+ and I am, as stated above O- but our daughter is type AB-.
(as a side note, she was the pregnancy I did not feel really ill with, my other children who are all type O-,O+ with were rough)
I know that this defies traditional blood type rules and I have researched a bit and have read about Cis-AB, where at some point in our lineage, the A and B may have become fused together, leaving an empty or “O” space, which I inherited and in fact passed to some of my children. Perhaps I am not actually “O” but test as “O” having some faded A or B. ( I am not a geneticist, can you tell? lol) We are not Chinese or Japanese but a mix of European ancestry, with a bit of Native American. I would like to get a test that explains this in case of health issues or some future paternity or maternity test. What test might you recommend?
Thank You for your time.
Added:
Cheryl Greene
Darla,
There is a very rare blood type (0.0004% or about 4 per million in the general population) known as the Bombay Blood type. In some places such as Mumbai (which was formerly called Bombay) the occurrences can be as high as 0.01% or 1 in 10,000. This group does not fall into the ABO system and the usual tests for ABO blood show them as group O.
If you suspect you or your child may have the Bombay blood type talk to your doctor about a specialized test for this blood type as it does not show up using the normal ABO blood type tests. The tests may vary based on where you can go to be tested, but ask you doctor to help you determine where to go and which test they will use.
If you or your children are Bombay blood type, you can not get blood that is A, B, O or AB, so it’s very helpful to have this information while you are all healthy.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Rosa
Im not sure what my blood type is but my daughter is b+ and her father is o+.. What would that make me.
Added:
Cheryl Greene
Rosa,
If your daughter’s blood type is B+ and if her father’s blood type is O+, you could be B+, B-, AB+ or AB-.
Let me know if you’d like an explanation.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Joseph
My girlfriend is o+ and her newly born son is o+. What would the fathers blood type have to be?
Added:
Cheryl Greene
Joseph,
If the mother’s blood type is O+ and the child’s blood type is O+, the father could be O+, O-, A+, A-, B+ or B-. He could not be AB+ or AB-.
Let me know if you’d like an explanation.
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Joseph
Where and how easy is it to find my blood type
Added:
Cheryl Greene
Hi Joseph,
Blood types are pretty easy to get. Here are a few ways:
1) Ask your doctor for a test — costs about $200
2) Order a home kit (I suggest you order two per person so you have a backup) – less than $10 per kit
3) Donate blood at the Red Cross or other Blood Bank — FREE and you get the satisfaction of helping other people
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Nikki
Hi, if both patents are positive how does baby end up negative? So mom is O+ and Daf is N+ and baby is O-…
Added:
Dana
Hi , if i am AB with RH negative and my husband is 0 positive can we have a baby with a negative Rh?what would our baby be?thank u very much
Added:
Cheryl Greene
Dana,
If you are AB- and the father of your baby is O+, your baby could be A+, A-, B+, or B-. Your baby could not be AB+, AB-, O+ or O-.
If you’d like an explanation, please let me know.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
lacey
Hi Im O+ and my Husband is A+ what is my daughters blood type
Added:
Cheryl Greene
Hi Lacey,
If you are O+ and if your daughter’s father is A+, your daughter could be A+, A-, O+ or O-. She could not be B+, B-, AB+ or AB-.
If you’d like an explanation, please let me know.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Annie
Im B+ and my baby is AB+, what tipe of blood is my husband, AB+? Thank you :)
Added:
Cheryl Greene
Annie,
If you are B+ and if your baby is AB+, your baby’s father could be AB+, AB-, A+ or A-. He could not be B+, B-, O+ or O-.
Let me know if you would like an explanation.
Best, @MsGreene
Note: I reply to a lot of the comments on DrGreene.com. I am the co-founder of DrGreene.com and Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
David...
Hi i am ab- and my wife is a+ so what will our child be.
Added:
Cheryl Greene
David,
If you are AB- and your wife is A+, the two of you could have children who are A+, A-, B+, B-, AB+ or AB-. You could not have children who are type O+ or O-.
Let me know if you’d like an explanation.
Best, @MsGreene
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner and wife, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Truleigh
If one parent is AB- and one is A+ what is likely going to be child’s blood type?
Added:
Cheryl Greene
Truleigh,
If one parent is AB- and if the other is A+, their child could be A+, A-, B+, B-, AB+ or AB-. The child could not be O+ or O-.
If you’d like an explanation, please let me know.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com and Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Kirsty Cooke
Hi I am ab+ my mum is a resus – what is my dad?
Added:
Cheryl Greene
Kristy,
If you are AB+ and if your mum is A-, your dad is B+.
Let me know if you’d like an explanation.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com and Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Amna Khan
If mom has o+ and dad has b+, would child have b+? Or different blood type?
Added:
Cheryl Greene
Amna,
If mom is O+ and if dad is B+, their child could be B+, B-, O+ or O-.
Let me know if you’d like an explanation.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com and Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Angel
Can a ab+ and a ab- have ab positive baby ?
Added:
Cheryl Greene
Angel,
Yes, an AB+ parent and an AB- parent can have a child that is AB+.
If you’d like an explanation, let me know.
Best, @MsGreene
Co-founder & Executive Producer, DrGreene.com
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner and wife, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Rebecca
Out of 6 kids there’s only 1 with a A+Blood type. 3 r A- and 2 r O+ . Can a A- & O+make a A+Blood
Added:
Rebecca
Thank You
Added:
Cheryl Greene
Rebecca,
Yes, if one parent is A- and the other is O+, they can have a child who is A+.
Let me know if you’d like an explanation.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com and Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Sophi
If the mother is a+ and father is b+ can the. Child be o-
Added:
Cheryl Greene
Hi Sophi,
Yes, it is possible for one parent to be A+ the other parent to be B+ and the child to be O-.
If you’d like an explanation, please let me know.
Best, @MsGreene
Co-founder & Executive Producer, DrGreene.com
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner and wife, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Brandy
I the mother am o- with a rh negative factor. My son is B+ would his father also be B+?
Added:
Cheryl Greene
Brandy,
If one parent is O- and the child is B+, the other parent could be B+ or AB+.
Let me know if you’d like an explanation.
Best, @MsGreene
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner and wife, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Sherri
I just had a baby I’m O+ both my girls are A- and the father is AB he’s not sure if positive or negative I need help with that
Added:
Diane
My dad is B. My mom is A. My older sister is A. I am 2nd, AB. 3rd is O. 4th is B.
Is it possible for the O sister to have the same father as us?
Added:
Cheryl Greene
Diane,
Yes, it is possible for an A parent and a B parent to have children who are A, B, AB and O.
If you’d like an explanation, please let me know.
Best, @MsGreene
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner and wife, but I am not Dr. Greene, nor am I a doctor. Please keep that in mind when reading my comments and replies.
Added:
Andrew
Hello,
Can you settle the debate for my wife and I. If my wife is A+ and I’m O- what blood type can our children be?
Thank you,
Andrew
Added:
Cheryl Greene
Andrew,
If your are O- and your wife is O-, your children could be A+, A-, O+ or O-.
Let me know if you’d like an explanation.
Best, @MsGreene
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner and wife, but I am not Dr. Greene, nor am I a doctor. Please keep that in mind when reading my comments and replies.
Added:
Theophilus V. Kpa-Sarto Sr.
Hi! I have a blood type A and my wife is O. What could be the blood type of my son sir?
Added:
Cheryl Greene
Hi Theophilus,
Thanks for writing in.
If one parent has type A blood and if the other parent has type O blood, each of their children could be A or O.
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Riz
My blood type is O+ My husbands blood type is A+ and my daughters blood type is AB+ how is this possible?
Added:
Cheryl Greene
Riz,
If you know who both parent are without a doubt, with this combination likely one of your blood types is different than previously thought. This can be due to an error in the testing or an error in recording. Retesting may be wise.
Best, @MsGreene
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner and wife, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Carla
My blood type is ab- and my sons blood type is a+ so what would my son’s fathers blood type be?
Added:
Cheryl Greene
Carla,
If your blood type is AB- and your son’s blood type is A+, his father could be A+, B+, O+ or AB+.
Let me know if you’d like an explanation.
Best, @MsGreene
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner and wife, but I am not Dr. Greene, nor am I a doctor. Please keep that in mind when reading my comments and replies.
Added:
Ann teneycj
If parents have 3 kids 1 type A, 1 type B and a third type 0 what is the proabability a fourth child would be AB?
Added:
Cheryl Greene
Ann,
If the same two parents have three children who are type A, type B and type O, we can deduce that the parents are type A and type B. There is a 56.25% that each of their children will be type AB.
Of interest, there is a 18.75% chance that each child will be type A, a 18.75% chance that each child will be type B and only a 6.25% chance that each child will be type O. So even though in the general population type O is the most common type and type AB is the least common type, for these two parents, it’s the opposite.
Best, @MsGreene
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner and wife, but I am not Dr. Greene, nor am I a doctor. Please keep that in mind when reading my comments and replies.
Added:
Cass
Both my son and I are B+
Are there any blood type that his father cannot be?
Added:
Cheryl Greene
Cass,
What is your blood type?
Best, @MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
Bky
Please doctor, can 0 positive father has 0 negative child?
Added:
Cheryl Greene
Bky,
Yes, if a father is O+ he can have a child that is O-.
Please let me know if you’d like an explanation.
Best, @MsGreene
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner and wife, but I am not Dr. Greene, nor am I a doctor. Please keep that in mind when reading my comments and replies.
Added:
Holly Moore
Mom is o negative son is o negative so what would be the fathers blood type?
Added:
Cheryl Greene
Holly,
If the mother is O- and the son is O-, the father could be O+, O-, A+, A-, B+ or B-. The father could not be AB+ or AB-.
Let me know if you’d like an explanation.
Best, @MsGreene
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner and wife, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Ejaye
If a father is o negative and a mother is a negative can the child be A positive
Added:
Cheryl Greene
Ejaye,
It is possible for one parent to have type O blood, the other parent to have type A blood, and their child to have type A blood. But two parents with Rh- blood can only have children with Rh- blood. However, if one parent is Rh- and the other is Rh+, they can have a child with either Rh- or Rh+ blood.
Since blood types are often different than what they are thought to be, it’s smart to have all three blood types tested again.
Best, @MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: I answer a lot of questions on DrGreene.com, I am Dr. Greene’s business partner and wife, but I am not Dr. Greene.
Added:
David
If a mother is A+ and the father is B-, what can the child be?
Added:
Cheryl Greene
David,
If one parent is A+ and the other is B-, each of their children could be A+, A-, B+, B-, O+, O-, AB+ or AB-. Basically, this combination does not rule out any possible outcome.
If you’d like an explanation, please let me know.
Best, @MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner and wife, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
David
Thank you Dr. Greene!
Added:
Kimberly
If a mother is A+ father is O+ can the child be AB+
Added:
Cheryl Greene
Kimberly,
Our current understanding of genetics is that it is not possible for one parent to be A+, the other parent to be O+ and a child their child to be AB+. An A parent can only have children who are A or O.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
Tams
daughter is ab mother is a+what can dad be
Added:
Cheryl Greene
Tams,
If the child is AB and if the mother is A, the father would be type B.
Best, @MsGreene
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner and wife, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Lori
Is it possible for my mom to be AB+ and my father O. I am O.
Added:
Cheryl Greene
Lori,
Our current understanding of genetics is that it is not possible for one parent to be AB, the other parent to be O and a child their child to be O. An AB parent can only have children who are A, B or AB.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
vinayasree
Hi am vinayasree
my moms blood group is o+and my dad’s is o- and I have b+ is this possible
Added:
Cheryl Greene
Vinayasree,
Our current understanding of science is that it is not possible for one parent to be O+, the other parent O- and their child to be B+. Two type O parents can only have type O children.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
Shania
My parents are B+ and O+ and I am A+. Is this possible?
Added:
Cheryl Greene
Shania,
Our current understanding of genetics is that it is not possible for one parent to be B+, the other parent to be O+ and their child to be A+.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
Zhaan
Hi Doc,am A+ and my husband is o+,my son’s blood group is A+with a D rhesus which I don’t get where the D is coming from.pls educate me more…
Added:
Yna
If a mother is type B+ and the father is O+ it is possible the baby will b A+?
Added:
Cheryl Greene
Yna,
Our current understanding of genetics is that it is not possible for one parent to be B+, the other parent to be O+ and a child their child to be A+.
Please let me know if you’d like an explanation.
In the meantime, it is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
Debbie brown
Is it possible to have a child B negative when the mother is A positive and the father is B positive
Fathers father is Rh AB negative
Added:
Cheryl Greene
Hi Debbie,
Yes, it is possible for one parent to be B+, the other to be A+ and their child to be A+.
If you’d like an explanation, let me know.
Best,
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
Alex
Is it possible to have a child blood type ab+ if a mother is a+ and the father is o+?
Added:
Cheryl Greene
Alex,
Our current understanding of genetics is that it is not possible for one parent to be AB+, the other parent A+ and a child that is O+. An AB parent can only have children who are A, B or AB.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought to be.
If the question is paternity, the only way to accurately determine who the father is, is with a DNA test. Here’s one example of a DNA test you can get online and administer in your own home. The results are mailed back to you as well.
I hope that’s helpful.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
Ma. Victoria Legaspi
Me and my husband have AB+, we have 3 children, the first two have type AB+ while our last daughter have A+. Is this really happens.
Added:
Cheryl Greene
Yes, it is possible for two AB+ parents to a child who is AB+ and a child who is A+. They can also have a child who is AB-, A-, B+ and B-.
If you’d like an explanation, please let me know.
Best,
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
Ziyan
My mother is A+ and my father is B+ is it possible that me and my brother can be O+?
Added:
Cheryl Greene
Ziyan,
Yes, it is possible for an A+ parent and a B+ parent to have children who are O+.
If you’d like an explanation, please let me know.
Best, @MsGreene
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner and wife, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Ziyan
Thank you
Added:
Ziyan
Could you explain how this works?
Added:
Cheryl Greene
Hi Ziyan,
A+, B+ O+
Blood types are comprised of two alleles. The most common (by far) are A, B, and O. Each person also has two Rh alleles that can be positive (+) or negative (-).
If a person has type A+ blood he or she has at least one A allele (this can be AA or AO) and at least one Rh+ allele (this can be ++ or + -).
If a person has type B+ blood he or she has at least one B allele (this can be BB or BO) and at least one Rh+ allele (this can be ++ or + -).
If a person has type O+ blood he or she has two O allele (OO) and at least one Rh+ allele (this can be ++ or + -).
In the example you provide, both parents would have to have an O allele and they would both pass that down to their child and at least one of them would pass down a + allele. The child would be O (OO) + (+ + or + -).
I hope that helps.
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Olivia
My mom has A- and my dad has B+ blood types. Based on that, what could my blood type be?
Added:
Cheryl Greene
Oliva,
If your mum has A- blood and your dad has B+ blood, you can have A+, A-, B+, B-, O+, O-, AB+ or AB-. Basically, this is one of the few parental combinations that doesn’t rule out any possible outcome.
Let me know if you’d like to know why.
Best, @MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
Anthony
What blood types are needed for my kids not to have type O ?
Added:
Cheryl Greene
Anthony,
If one parent is AB, the children can not be type O. Other than that, all combinations an result in a type O child.
Best,
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
seeker20
Hi Doc,
My wife just give birth and my baby is blood type is B+
my partner and i were ’bout type O is the baby is mine?
Added:
Cheryl Greene
Seeker,
Our current understanding of science is that it is not possible for two O+ parents to have a child that is B+. Two O+ parents can only have children who are O+ or O-.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought to be.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
WLaett
I don’t really remember my blood type though I do remember that it wasn’t O. It was Either A or B, not AB if I recall, and I think + though I’m not sure (I last donated blood on 9/11/2001).
I’m thinking it was either B+ or B- though again I can’t be certain after this long.
My mother got our genes mapped at 23andme and aside from something we already suspected turning out to be true (we have some east asian heritage on the Estonian side), it also turns out she is of the very rare Diego (Di(a+b+)) blood group.
What I am dying to know – mainly because it may have health implications if I need a transfusion at any point – is how a rare NON ABO blood group is inherited. What I mean more specifically is…since my mother is Di(a+b+), is it a 50/50 chance that I am as well? Or do mothers just pass that down to their son either way?
I assume my father was not diego (a+b+) primarily because…well…it is exceedingly rare – something like less than 0.01% of Europeans and Africans have it, and it is mainly diagnostic of having east asian / mongolian heritage (Native Americans would fall under this category as they ultimately originated there was well). It is anomalously high in polish populations and his mother’s side was from Poland and the Baltics and Russia, so I suppose the odds of him having it are quite a lot higher than for western Europeans (though is father’s side is French) where it is seemingly non-existent unless the person has at least some asian or native heritage. But even in Poland – highest % in Europe – it is less than 0.5% of the population. So still incredibly unlikely that he had it (and he’s dead so I can’t get him tested now).
Given all of that…I am GUESSING it is a 50/50 chance that I am also Di(a+b+) unless my father also was (not bloody likely unless the native rumors on his side were true which I sincerely doubt aside from his grandfather being fairly dark skinned and black haired) – is this the case? Or is it, again, just something that is maternally passed down unlock the main ABO blood groups?
I wonder if all the immuno skin problems I had when I was young and that my nephew has at the same age in the same places might be related to that. I even wonder if my younger sister dying of SIDS might be related to some reaction between mother and child due to different blood groups.
I guess it isn’t likely anyone will know because I have searched the net far and wide and all anyone ever talks about is inheriting A, B, AB, or O and never the rare blood groups.
Added:
Alex
Can O types have kids
Added:
Cheryl Greene
Alex,
There is no reason based on blood type that a mother with type O blood and a father with type O blood can not have children.
Best, @MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner and wife, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Veronica
I’m O+ and I can kids
Added:
Kurdo
my blood is A+ and my blood wife is A+ ..what the type is my child will build is possible or best ?
Added:
Cheryl Greene
Kurdo,
If both parents are A+, they can have children who are A+, A-, O+ or O-. None of these blood types cause health issues.
If the child is female and A- or O-, she will need to alert her doctor before she has children, but that is very far in the future and if there is a medical attention before pregnancy, no issues to her health or her children’s health based on blood type.
Best, @MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner and wife, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Brenda
My blood type is B don’t know if positive or negative and husband is O and same dont know if positive or negative but daughter came out AB+ how is this possible
Added:
Cheryl Greene
Hi Brenda,
Our current understanding of genetics is that it is not possible for one parent to have type B blood, the other parent to have type O blood and a child that is type AB+ or AB-.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
Downtown97
I am O negative, my mom is A positive. What blood type does my dad have or could have then, since he does not know what his blood type is?
Added:
Cheryl Greene
Hello,
If you are O- and your mom is A+, your father could be A+, A-, B+, B-, O+ or O-. He could not be AB+ or AB-.
Hope that helps,
Best, @MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner and wife, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Sleepless in Sin City.
My daughters blood type is AB my wife and my own is O+ is this possible? According to what I’ve been told and lead to believe it’s a rare thing that could be brought on by her grandparents. At least this is what her Mother and the nurse at the hospital were saying.
Added:
Cheryl Greene
Dear Sleepless,
Our current understanding of science is that it is not possible for two O+ parents to have a child that is AB+ or AB-.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are remembered.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
Tyler
My mom is +A and dad +O what am I?
Added:
Cheryl Greene
Tyler,
If your mom is A+ and you are O+, your father could be A+ or A-.
Let me know if you’d like an explanation.
Best, @MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner and wife, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
suresh
I am one child father. My blood group is O- and my B+ can we plan second baby. He/she live perfect life.
Added:
Cheryl Greene
Suresh,
I think there is a word missing from your question. Is B+ the blood group of your partner?
Best, @MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner and wife, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Thea
Iam 0- blood type and the father is 0. Our daughter is A.
How could this be?
Added:
Cheryl Greene
Thea,
Our current understanding of genetics is that it is not possible for two parents with O type blood to have a child that is type A. If one of the parents is type A or AB, is would be possible, but two O type parents can only have children with O blood type.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are remembered.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
aju
My wife blood group ab+
I am o+ my baby boy b+
This was corect?
Added:
Cheryl Greene
Aju,
Yes, it is possible for one parent to be type AB+, the other to be O+ and the baby to be B+.
If you’d like an explanation, please let me know.
Our current understanding of science is that it is not possible for one parent to be AB-, the other parent O+ and a child that is O-. An AB parent can only have children who are A, B or AB.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are remembered.
Best,
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
dianne
its posibble when my mother is blood type B and my father is blood type O but i am blood type A+?
Added:
Cheryl Greene
Dianne,
Our current understanding of science is that it is not possible for one parent to be B, the other parent O+and a child that is type A.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are remembered.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
Manda
Ok I’m A+ and the dad is B+
Are son is O- is he the dad ?
Added:
Cheryl Greene
Hi Manda,
If one parent is A+ and the other is B+, it is possible that they can have a child who is O-. Some blood types rule out a potential father, but blood types never determine a specific man as the father. For that you need to do a DNA paternity test. They are 99.999% accurate. Here is an example of one DNA test kit that you could use at home and mail into the lab. The results are mailed back to you as well.
I hope that’s helpful,
Best,
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
Huwetah
Hi I do not know my bloodtyoe but my mom is ab+ and my dad is o- what is my blood type
Added:
Cheryl Greene
Huwetah,
If you mom is AB+ and your dad is O-, you could be A+, A-, B+, or B-.
Let me know if you’d like an explanation.
Best,
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
Brittney smith
My babys blood type is b+ me and who I thought was her father has o+ blood is he actually the father or not? Nowtheres a mother guy and he has b+…. Could he be her father instead of who I thought was
Added:
Cheryl Greene
Brittney,
Our current understanding of science is that it is not possible for two O+ parents to have a child that is B+. It is possible for one O+ and one B+ parent to have a child that is B+.
To determine paternity, a DNA test is 99.999% accurate. You can order them online, take the test in the privacy of your own home, mail in the tests and receive the results by mail. Here is a link to one test you can order online, but there are many options.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
Kimberly
I was just looking at my fathers blood donor card. It says his blood is AB-. My blood type on my donor card says I’m 0+. Does this mean he is not my father? I’m not aware of my mothers blood type not that I think it matters for this question.
Added:
Cheryl Greene
Kimberly,
Our current understanding of science is that it is not possible for a parent who is AB- to have a child who is O+. An AB parent can only have children who are A, B or AB.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are thought to be.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
Christy
My mother is B+ and my father is O+. My brother is O+ as well but I’m O- is this possible?
Added:
Cheryl Greene
Christy,
Yes, it is possible for one parent to be B+, the other to be O+, and their children to be O+ or O-. They could also have children who are B+ or B-.
Let me know if you’d like an explanation.
Best, @MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner and wife, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Casey
I just had a baby the babies blood is o+. The mother’s is o+ and the fathers is o-. Is that possible?
Added:
Cheryl Greene
Hi Casey,
Yes, it is possible for one parent to be O+, the other parent to be O- and their child to be O+.
Let me know if you’d like an explanation.
Best, @MsGreene
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Robyn McCracken
Can an O+ parent, and an O- parent make an A+ child?
Added:
Cheryl Greene
Robyn,
Our current understanding of science is that it is not possible for one parent to be O+, the other parent O- and a child that is A+.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are remembered.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
Brittney
If one of my parents are A- and he other is AB+, is it possible for me to be AB-?
Added:
Cheryl Greene
Brittney,
Yes, it is possible for one parent to be A-, the other to be AB+ and the child to be AB-. If you’d like an explanation, let me know.
Our current understanding of science is that it is not possible for one parent to be AB-, the other parent O+ and a child that is O-. An AB parent can only have children who are A, B or AB.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are remembered.
Best,
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
Olivia
Hello, i am Olivia and my mother and father are both O. I am giving blood soon and I need to know my blood type. What would it be?
Added:
Cheryl Greene
Oliva,
When you give blood, they will test your blood type, but if both your parents are type O, you will also be type O.
Best, @MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Anthony
Hello, I am the father with a blood type of O – , The mother is AB+… our child came out with A+. is this correct? I am the father? or I’m letting people get to my head?
Added:
Cheryl Greene
Anthony,
Yes, it is possible for a father to be O-, a mother to be AB+, and their child to be A+.
If you’d like an explanation, please let me know.
Best, @MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
RAMESH
if farhera blood group is B positive and morher also B Positive the blood group of the children will be
Added:
Cheryl Greene
Hello Ramesh,
If one parent’s blood group is B+ and the other is also B+, each of their children can be B+, B-, O+ or O-.
Let me know if you’d like an explanation.
Best,
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
denise
Is it possible for to parents to be o- and have a child with b+
Added:
Cheryl Greene
Denise,
Our current understanding of genetics is that it is not possible for both parents to be O- and their child to be B+. Two O- parents can only have a child who is O-.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are remembered.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
Brittney
Hello, my blood type is a+. What are the possibilities of my parents blood type.
Added:
Cheryl Greene
Brittney,
If you are A+, at least one of your parents is type A or AB. The other could be O, A, B or AB.
If you are Rh+, at least one of your parents has to be Rh+, the other could be Rh+ or Rh-.
I hope that helps,
Best,
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
T'Shawn Dennis
Hello, my mothers O- and my father is supposedly AB+ what is the possible result
Added:
Cheryl Greene
T’Shawn,
If one parent is O- and the other is AB+, each of their children can be A+, A-, B+ or B-. Their children can not be AB+, AB-, O+ or O-.
Best, @MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Alyssa
So my child and I are A- The Dr’s said, but the Father is positive blood. So what does that necessarily mean? Does that mean that he isn’t the child’s Father?
Added:
Cheryl Greene
Alyssa,
No, that does not mean he is not the child’s father. If a child is -, both of his parents can be either – or +.
The only way to determine the child’s paternity is a DNA test. They are fairly inexpensive now, you can order them online, do the test in the privacy of your own home, mail them in and receive the results by mail. They are 99.999% accurate.
Hope that helps, @MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Chris
Dear DrGreene,
How accurate is the blood test for determining the father of the child.
My brother has type 0 and the woman has type 0 at the same time and the child is type b, is that possible?
Awaiting your positive response.
Thanks
Chris
Added:
Cheryl Greene
Chris,
Our current understanding of science is that it is not possible for two type O parents to have a child with type B blood, but blood tests are not considered accurate for paternity.
If there is a question, a DNA paternity test is the only test considered definitive. They are fairly inexpensive, can be ordered online, taken in the privacy of your own home, mailed in, and results received by mail. They are considered 99.999% accurate.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Mohan Natekar
Hello Doc,
My blood group is 0+ve and my wife blood group is 0 +ve so what could my baby’s blood group ?
Thanks & Regards,
Mohan Natekar
Added:
Cheryl Greene
Hi Mohan,
If both parents’ blood is O+, each of their children can be O+ or O-.
If you’d like an explanation, please let me know.
Best, @MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Eddy
Hello Doctor, My Girlfriend claims she is O blood group and are both parents are AB, is that possible? Is that possible, she’s getting mad
Added:
Cheryl Greene
Eddy,
I don’t understand your question. Are you saying that both of your girlfriends parents are AB and she is O?
Best, @MsGreene
Note: I am the co-founder of DrGreene.com, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.
Added:
Krystal
Hello. My blood type is A+ and my father’s is O+. What would my mom’s blood type be?
Added:
Cheryl Greene
Krystal,
If your father’s blood type is O+ and if your blood type is A+, your mother would have to be A+ or A-.
Let me know if you’d like an explanation.
Best, @MsGreene
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Faiz
Hi doc,
My blood is “A+” and my wife blood is “AB” Is it correct my son can’t “O” category?
Added:
Cheryl Greene
Faiz,
Our current understanding of science is that it is not possible for one parent to be AB, the other parent A+ and their cild to be O. An AB parent can only have children who are A, B or AB.
It is wise to have all your blood types retested. It’s not uncommon for blood types to be different than they are remembered.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
ellaine
Hello, my blood type is B. My parents are both type O. And my 3 siblings are also type O. I already retested my blood many times but it’s really type B. Does it mean that i’m not real daughter of my parents?
thanks
Added:
Cheryl Greene
Ellaine,
Our current understanding of science is that it is not possible for two parents with type O blood to have a child that is type B.
Though you have retested your blood, have you confirmed your parents’ are indeed both type O? It’s not uncommon for blood types to be different than they are remembered.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
ellaine
yes they are both type O. I already checked their medical records.
Added:
Cheryl Greene
Ellaine,
Have you talked with them about your fears? If not, this would be a good time. They may have news for you or they may have another explanation, such as their medical records have been updated with corrected information. Either way, if this is troubling you, it’s time to ask. If you wait until they are gone, you won’t have the opportunity.
Best,
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
Vee
My dad’s a O and im a B+ is it possible????
Added:
Cheryl Greene
Hi Vee,
If your mom is either B or AB, your dad could be O and you could be B.
Hope that helps, @MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Julie
If my ex wife is ay+ and I’m o- what should my kids be cause all my kids are different blood groups I’m asking of behalf of someone
Added:
Susie Gresham
Hi, Is it possible for a Rh- parent and a O positive parent to have a A positive child?
Added:
Cheryl Greene
Susie,
An Rh- parent and an O+ parent can have an Rh+ or an Rh- child. One of them must be type A or AB for the child to be type A.
Best,
MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
J
Hello, 1. If a Mother is A+ & father AB-…..can one child a son be A+ & a daughter be AB- what are chances or percentages that being? 2. Does it also do with what the Grandparents blood types are in the chances or percentages?
Added:
Cheryl Greene
J,
If a mother is A+ and a father is AB-:
There is a 50% chance each child will be type A
There is a 37.5% chance each child will be type AB
There is a 75% chance each child will be Rh+
There is a 25% chance each child will be Rh-
I don’t believe the grandparents blood types change the percentages. If someone reading this has more information, please pipe up.
Best, @MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
J
Thank you for your reply…I see & know the %’s.. I also checked on site that had calculator…but on one site I looked up & it calcaluted.. if a father is AB – & child is AB- then mother had to be a – ..this was confusing. With the % you gave & I looked up on another site??? I don’t under stand why different??Can you Explain? The AB- child daughter what probability would she be on DNA cheek swab test Or what probility would she be as child to the father on a DNA Cheek swab test done in a County Attorney office or legal setting?..or any help appreciate? all Thank you so much!
Added:
Cheryl Greene
J,
I can’t tell you what a DNA test will show based on blood types. No one can. Sorry.
Best,
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
Job Murphy
I’m AB+ and my girl friend is O+ and our baby girl is AB + is that possible?
Added:
Cheryl Greene
Job,
Our current understanding of science is that it is not possible for one parent to be AB+, the other parent O+ and a child to be AB+. An O parent can can not have an AB child.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are remembered.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: Not Dr. Greene, not a doctor. Keep that in mind when reading my comments and replies.
Added:
Zainab
Madam,if we both siblings are A+ that is blood group of my mother whereas my father is O-,
Is it confirmed that my mother homozygous is rh+?
Added:
Cheryl Greene
Zainab,
If your father is O- and your mother is Rh+, and you and your siblings are A+, your mother would be A+.
Let me know if you’d like an explanation.
Best, @MsGreene
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Marie
My husband is O pos, I am AB neg. With both pregnancies I had to have the RH shot. My daughter is B pos. Is this normal and is there any reason to suspect that my daughter isn’t my husband’s child?
Added:
Cheryl Greene
Marie,
In the scenario you suggested, it is very possible for the mother to be AB-, the father to be O+ and the child to be B+.
However, I can not tell you if he is the father or not. Blood types can not determine paternity, but they can rule out some potential men as the father. In this case, he is not ruled out.
I hope that’s helpful.
@MsGreene
Added:
jeanne
HI, I’m sorry if this question has already been covered but I couldn’t seem to find my exact scenario & wanted to be sure I understood correctly. My father was O+. My mother always said she thought she was B+ but I saw some paperwork saying she was A+. I have A- blood. Could this be possible. When my son needed blood (also A-) I was the only one in my family who could give as no one else matched. What blood types could be possible in this situation? Thanks so much for your help.
Added:
Cheryl Greene
Jeanne,
If your father is O+ and you are A-, your mother could be A+, A-, AB+ or AB-.
Let me know if you’d like an explanation.
Best, @MsGreene
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Dhee
Hi I’m wondering my blood type is B+ and i want to know what is my child possible blood type. Thank you
Added:
Cheryl Greene
Dhee,
Your child’s blood type is determined by both parents blood types, so it’s hard to say without knowing your partner’s blood type. But will pass along half the code for your child and that will be either B+, B-, O+ or O-. If your partner is A or AB, that opens up A+, A-, AB+ and AB-.
Best, @MsGreene
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Dhee
Hi again my two sisters are both A+ and I’m B+ does it means our parents blood types are AB+? Thank you
Added:
Cheryl Greene
Dhee,
If three siblings are blood types A+ and B+:
At least one parent has to be RH+. The other can be R+ or Rh-.
One parent has to pass down an A AND the other has to pass down a B.
One parent could be AB+, if the other parent is O+ or O-.
One parent could be AB-, if the other parent is O+.
One parent could be A+ or A-, if the other parent is B+.
One parent could be B+ or B-, if the other parent is A+.
I hope that’s helpful.
Best, @MsGreene
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Dina
Hi docter,
Im rh- and the father of my baby is 0+ what blood group could my baby be
Added:
Cheryl Greene
Dina,
From what you’ve told me, your baby could be Rh+ or Rh-.
Is your blood type O-, A-, B- or AB-? Without knowing that, I can only tell you, if the father of your baby is O+ and you are Rh-, your baby could be O+ or O-. But this is very incomplete.
Best, @MsGreene
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Gen
Hellow Dr. My blood type is A positive , my fathers blood type is O, my mothers blood type is B positive, my brother and sisters have the blood types B positive and O, Why is it that it is only I who has the A positive blood? What do this one tell?
Added:
Cheryl Greene
Gen,
Our current understanding of genetics is that it is not possible for one parent to be B+, the other parent O and a child that is A+. If one parent is B and the other is O, they can have children who are B and O. One of the parents must have type A or AB blood for the child to be type A.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are remembered.
@MsGreene
Co-founder & Executive Producer DrGreene.com
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
rohit
My blood group is O positive and my wife blood group is B positive; Is it possible that my baby have blood group A positive.
Added:
Cheryl Greene
Rohit,
Our current understanding of genetics is that it is not possible for one parent to be O+, the other parent B+ and a child that is A+. One of the parents must have type A blood to pass down to the child.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are remembered.
@MsGreene
Co-founder & Executive Producer DrGreene.com
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
jessica
hello. my dad is O- and my mum is O+. i’m guessing i’m an O. but what Rh am i?
Added:
Cheryl Greene
Jessica,
If your dad is O- and your mum is O+ you could be O+ or O-. You would have to be tested to be sure, but O+ is more common than O-.
Best, @MsGreene
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Alyssa White
I’m O+ and my daughter is O+ so what could her father’s blood type be?
Added:
Cheryl Greene
Hi Alyssa,
If you are O+ and your daughter is O+, her father could be O+, O-, A+, A-, B+, or B-. He could not be AB+ or AB-.
If you’d like and explanation, please let me know.
Best, @MsGreene
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com and Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Rachel G.
My father is type O, but my mother is RH negative. Both of my siblings and both of my children are type O.
I somehow came out as A positive.
I’d like to learn why it is that I am A positive, but the only explanation I’ve gotten is “its complicated” from my GP.
Could you please explain this to me and/or direct me to an easy to understand resource that can?
Thank you
Added:
Flavia
I’m A POSITIVE with Rh negative and the baby came out o positive.. what blood type does his father has?
Added:
Cheryl Greene
Flavia,
The POSITIVE part of the blood type is Rh, so you’re either A Rh+ or A Rh-, which are called A+ or A-. You can’t be both.
If you are A+, and your baby is O+, the father could be A+, A-, O+, O-, B+, or B-, but not AB+ or AB-.
If you are A-, and your baby is O+, the father could be A+, O+, or B+, but not A-, O-, B-, AB+ or AB-.
Hope that helps, @MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Danica B. Goayan
Doc I just want to ask, is it true that its hard to conceive if both are type AB? Because in my case Doc my husband is Type AB and me also is type AB. Way back 2014 Doc I got pregnant but I suffered Miscarriage that time I’m 2 months pregnant, until now Doc were really trying to conceive. Does it affects Doc that we both have the same Blood Type?
Hoping for your response Doc, thank you so much
Danica
Added:
Cheryl Greene
Danica,
I don’t know of any research that shows it’s harder to conceive if both mother and father have the same blood type. Does anyone else here have research that would show this has any impact?
Best, @MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Shelbyy Johnston
I have O- and my spouse has A+ was curious on what the possible blood types for my children could be
Added:
Cheryl Greene
Shelbyy,
If you are O- and your partner is A+, each of your children could be O+, O-, A+ or A-.
Best, @MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Caitlin Robertson
Hi,
My dad is AB- and my mum is o+ how is it possible for me and my siblings to have o-blood? and yes a DNA test has been completed we are his kids.
Added:
Cheryl Greene
Caitlin,
According to our current understanding of genetics, this isn’t possible.
DNA paternity tests are 99.999% accurate, so I would accept those results. Are you sure all the blood types are accurate?
If the blood tests are accurate and the DNA tests are accurate, this is a genuine anomaly.
Best, @MsGreene
Note: I reply to a lot of the comments on DrGreene.com, I am the co-founder of DrGreene.com and Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Marie
I’m O positive and my husband said he was A positive. We have a baby girl who is A positive and just found out that our twins girls who are 2 & 1/2 are AB positive. I’m confused. Is that possible or would he have to be AB positive? Thank you.
Added:
Cheryl Greene
Marie,
Our current understanding of science is an O parent can not have a child who is AB.
It is not uncommon for blood types to be different than they are remembered. It would be wise to have all your blood types retested.
Best, @MsGreene
Note: I reply to a lot of the comments on DrGreene.com, I am the co-founder of DrGreene.com and Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Linus
Can both parents that have the same blood type A+ give birth to what group of a child?
Added:
Cheryl Greene
Linus,
If both parents are blood type A+, each of their children can be A+, A-, O+ or O-.
If you’d like an explanation, let me know.
Best, @MsGreene
Note: I reply to a lot of the comments on DrGreene.com, I am the co-founder of DrGreene.com and Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Ajith
I’m B+ve,my father O+ve and my mothers B-ve. If i marry which blood group is needed for a baby boy
Added:
Cheryl Greene
Ajith,
Our current understanding of genetics is there is not a link between parents blood group and the gender of their child.
Consider this — most parents don’t have all boys or all girls. If blood group determined the gender, then all the children would be the same.
Best,
@MsGreene
Added:
Krishna
Hi doctor this is Krishna mine is O positive my wife is A negative my child is boy or girl and what blood group he/she have?
Added:
Cheryl Greene
Krishna,
I can not tell you whether your child will be a boy or girl. If I could do that, I would be very famous :)
I can tell you that if your blood type is O+ and your wife’s is A-, each of your children could be O+, O-, A+ or A-.
There is one additional concern — when the mother’s blood type is Rh- and the father’s is Rh+, there can be a blood type incompatibility. Dr. Greene has written extensively about it in this post — How To Determine and Manage Rh Incompatibility.
Best,
@MsGreene
Added:
Carla
Hello I had a question I am a little confused about.
I am o+ and all three of my sons are a+.
I am wondering what their fathers blood type could be?
Also, I’m confused as to why exactly were my three sons bilirubin higher than normal at birth, I know it has something to do with blood type or something but I’m just a tad confused. My dr tried explaining but I didn’t understand. Thank you.
Added:
carolnina
the mother is AB and the father is O how come that the baby is type O and now has a sepsis
Added:
Cheryl Greene
Carolnina,
Our current understanding of science is that it is not possible for one parent to be AB, the other parent O and a child that is O. An AB parent can only have children who are A, B or AB.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are remembered.
I doubt that the sepsis is related to the blood type. There can be, however, a blood issue if the mother is Rh-, the father is Rh+ and the baby is Rh+.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Added:
Lavina
My mother is O and father is B and I am B+. I don’t know if either have a – or + ? Would that matter? My sister is AB+ that does not make sense to me.
Added:
Cheryl Greene
Lavina,
According to our current understanding of genetics, if a child is AB, his or her mother can not be O.
The most likely cause for this discrepancy is one of the blood types is different than thought. It is not unusual for there to be an error in the test, an error in reporting, or an incorrect memory of one or more of the blood types. It would be wise to have both types retested.
Best,
@MsGreene
Added:
lou
Hi Dr,
My daughter had our first grandchild yesterday morning, Father is O and She is O baby boy is A, that seems impossible if i understand your chart? But she is not the cheating type so we are all in shock….what are other possibilities if any?
Added:
Cheryl Greene
Iou,
You are correct. This is considered an impossible outcome.
The most likely situation is one of the three blood types is not what you think it is. This if far more common that you would guess. Either one of the tests had an error, or was recorded inaccurately, or simply remembered differently than it is.
If there remains a discrepancy after re-testing, the best way to know for sure is DNA paternity testing, which is 99.999% accurate.
Best,
@MsGreene
Added:
Hatton
I am A+ n my ex is A+ but our daughter is O- does that mean he’s not her daddy?
Added:
denise
Is it possible that two parents have a child that is B possible
Added:
shamira
Hi Doctor, I am A- and my husband is 0+ what could our child be?
Added:
Cheryl Greene
Shamira,
If you are type A- and your husband is type O+, each of your children could be O+, O-, A+ or A-.
Let me know if you’d like an explanation.
@MsGreene
Added:
shamira
Thank you
Added:
Merrith
If I am RH 0- and my mom was a- what would my father be?
Added:
Cheryl Greene
Merrith,
If you are O- and your mom was A-, your father could be O+, O-, A+, A-, B+, or B-. He could not be AB+ or AB-.
Let me know if you’d like an explanation.
Best,
@MsGreene
Added:
Sherry horwath
Is it possible for a child to have AB positive if one parent is AB positive and the other is o positive?
Added:
Cheryl Greene
Sherry,
Our current understanding of science is that it is not possible for one parent to be AB+, the other parent O+ and a child to be AB+. If one parent is AB and the other parent is A, B or AB, it is possible.
In a situation like this, it is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are remembered.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Added:
Mher Diosomito
Hi my husband is o+ and me is ab what was the baby s blood type
Added:
Cheryl Greene
Mher,
If one parent is AB and the other is O+, each of their children will be either A+, A-, B+ or B-.
If you’d like an explanation, let me know.
Best,
@MsGreene
Added:
Lim
Ok Noted. But based on this website endmemo.com there is 75% more for an type A or B passed down to him/her child, am i correct and only 25% for blood type O.
So could there highly be chances she could mostly have the same..?? You also stated that it’s most common blood types in the world
Added:
Margaret
If im an b+ and my daughter is an a+ what would her dad be
Added:
Cheryl Greene
Margaret,
If you are B+ and your daughter is A+, her father would have to be A+ or A-.
If you’d like an explanation, let me know.
@MsGreene
Added:
Lim
Dear Dr.Greene,
My dad is O+… My blood type is also the same. I’m not sure what my Mum blood is as my parents are seperated..
What is the likelihood of my Mum blood type is? Does she also happen to be O+/O-? Btw, im asian..
Hope to hear from you soon. Thank you
Added:
Cheryl Greene
Lim,
Type O blood is the most common type, but a parent does not have to be type O to pass that down to her child. In fact the only blood type that can not pass down O is AB. If you are O+, and your father is O+ your mother could be O+, O-, A+, A-, B+ or B-.
The only way to know for sure, is to have her blood tested.
@MsGreene
Added:
Clare
Hi my blood type is b neg and daughter is 0 negative what is the fathers blood type please?
Added:
Cheryl Greene
Clare,
If your blood type is B- and your daughter’s blood type is O-, her father’s blood type could be O+, O-, B+, B-, A+, A-, but can not be AB+ or AB-.
I hope that’s helpful,
@MsGreene
Added:
Debbie
My blood type is AB Neg and my husband is O negative. What would my son be? A or B?
Added:
Cheryl Greene
Debbie,
If one parent is AB- and the other is O-, each of their children could be A- or B-.
Best,
@MsGreene
Added:
Payal
My blood group is AB+ and my husband’s O+. What are the possible blood group that my child may born with?
Added:
Cheryl Greene
Payal,
If one parent’s blood group is AB+ and the other is O+, each of their children could be A+, A-, B+ or B-.
Let me know if you’d like an explanation.
@MsGreene
Added:
Priya
My blood group is o positive and my husband blood group is AB negative my son bloody group ?
Added:
Cheryl Greene
Priya,
If your blood is O+ and your husband’s is AB-, each of your children can be A+, A-, B+, or B-.
Best,
@MsGreene
Added:
Alvaron Alexander
I am A+ female and my significant other is B- male. Is it possible for us conceive and have a healthy child?
Added:
Cheryl Greene
Alvaron,
There is no reason based on your blood types that you can not have a healthy child. The issue with blood type incompatibility is if the female is RH- and the male is Rh+.
Best,
@MsGreene
Added:
Shawntee
I’m O+ and my daughter is A+. What would her dad’s blood type have to be to make her A+?
Added:
Cheryl Greene
Shawntee,
If your blood type is O+ and your daughter’s is A+, her father would have to be A+ or A-.
Best,
@MsGreene
Added:
Arthur Jones
My daughter is A+ so I want to know what will I be.
Added:
Cheryl Greene
Arthur,
Do you know your daughter’s mother’s blood type? Without knowing that, no blood types are eliminated.
Best,
@MsGreene
Added:
Jamie
My blood type is O-. My daughter is B-. My son is O-.
What would my husband be?
Added:
Cheryl Greene
Jamie,
If your blood type is O- and you have one child who is B- and one who is O-, and they have the same father, he would be B+ or B-.
Let me know if you’d like an explanation.
Best,
@MsGreene
Added:
Jacky
Hi
I’m O+ and my husband is A-, my children are all O-
my child would like to know why her blood type is O- and not A+
Added:
norda
if a mother is O neg and father is O pos can the daughter be A neg?
Added:
Cheryl Greene
Norda,
Our current understanding of science is that it is not possible for one parent to be O-, the other parent O+ and a child that is A-. Two type O parents can only have type O children.
It is wise to have all your blood retested. It’s not uncommon for blood types to be different than they are remembered.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Added:
DB
If one parent is O RH negative, and the other parent is O RH positive, is it possible to have a baby A RH negative?
Added:
Cheryl Greene
DB,
Our current understanding of science is that it is not possible for one parent to be O-, the other parent O+ and a child that is A-. For a child to have type A blood, one parent needs to be type A or AB.
It would be wise to have all your blood retested. It’s not uncommon for blood types to be different than they are remembered.
Best,
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Added:
DB
Recently I found a card from the hospital I was born at with my parents, siblings, and my blood type (when I was born and registered). I’m the only one w A-. My mother swears she never had an affair. The only other possibility is I may have been switched at birth. And suggestions on how I go about researching this?
Added:
DB
I had my blood tested, and the records were incorrect in 1970. I am O negative. Thank you Doctor
Added:
Cheryl Greene
DB,
I’m very glad you were able to resolve this seeming inconsistency. I would love for you to comment to other folks here who are worried because their blood types appear to be “impossible”. It is so common for records to be incorrect.
Best,
@MsGreene
Added:
Cheryl Greene
DB,
Old records are sometimes in error. Before drawing a conclusion, it is wise to have your blood and your parents’ blood retested. Better yet, you can do a DNA paternity test (for about $99, with testing at home then sent to a lab) that is 99.999% accurate. This would require your father’s cooperation.
Best,
@MsGreene
Added:
Teresa
Teresa
Dr. Green,
If a mother has the blood type O negative and the father is A positive, what could their children be? A negative?
Thank you!
Added:
Cheryl Greene
Hi Teresa,
If one parent is O- and the other is A+, each of their children can be O+, O-, A+ or A-.
Best, @MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Augustine
Hi Dr, my daughter was recently sick and needed blood. My wife and I volunterred to donate our blood but to our surprise both of us could not because ours didn’t March with hers. Is there a possibility for that?
Added:
SHANOJ
Sir
My Blood Group AB+ and my Wife Blood group B+, My child what are the blood group.
Added:
Cheryl Greene
Shanoj,
If one parent is AB+ and the other is B+, each of their children could be AB+, AB-, A+, A-, B+ or B-. None of their children can be O+ or O-.
Best,
@MsGreene
Added:
SHANOJ
possible o+
Added:
Cheryl Greene
Shanoj,
If both parents are O+, each of their children will be O+ or O-.
Best,
@MsGreene
Added:
Joy
My blood group & my wife’s blood group is same.. Will it take any effect on our upcoming 1st children ??
Added:
Cheryl Greene
Joy,
Parents blood type determines their child’s blood type, but they will not necessarily be the same. What are your blood types?
Best,
@MsGreene
Added:
BABUU
My blood group is 0+ve and my partner is 0+ve…what will be our child blood group be??
I pleas to here from you.
Added:
Cheryl Greene
Babuu,
If you and your partner are both O+ each of your children could be O+ or O-.
Let me know if you’d like an explanation.
Best, @MsGreene
Note: I reply to a lot of the comments on DrGreene.com, I am the co-founder of DrGreene.com and Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Tony
My partner is o negative i am o positive is these blood group compatible
Added:
Cheryl Greene
Tony,
Blood type incompatibility occurs when the mother is Rh- and the father is Rh+. There is no issue if the mother is Rh+ and the father is Rh-. You can get the details in Dr. Greene’s Q&A How To Determine and Manage Rh Incompatibility.
Best,
@MsGreene
Added:
Tania Rodgers
Hi. Im an o- and both my daughters are o-. Not sure of my sons but being 2 negatives make a negative can i assume my husband is a negative as well as both my boys?
Added:
Tania Rodgers
Thank-you yes that makes sense.
Added:
Ashley
My blood type is o- and the father to my child has o+ blood…So I know our child will have O type blood but if my child is born with o- negative blood will that mean she and I are rh incompatable? or is she is born with o+ blood will her and her father be rh incompatable since he has o+ blood type as well?
Added:
Cheryl Greene
Ashley,
Dr. Greene has written a full explanation to your question –> How To Determine and Manage Rh Incompatibility.
Best,
@MsGreene
Added:
Neethu
Hello Doctor…
My husband’s blood gp is O positive, my blood gp is AB positive .we have one male child what are the possible blood gps…
Added:
Cheryl Greene
Neethu,
If one parent is O+ and the other is AB+, each of their children could be A+, A-, B+ or B-. They can not be AB or O.
If you’d like an explanation, please let me know.
Best,
@MsGreene
Added:
Suzanne
Hi Dr Greene, I am A+ My 2 children are O- both their fathers are A+. Is that possible?
Also One of my daughters (O-) has an O + baby.
Added:
Cheryl Greene
Suzanne,
It is possible for two A+ parents to have children that are O-. It is also possible for a parent that is O- to have an O+ child.
If you’d like an explanation, let me know.
Best,
@MsGreene
Added:
Gf
My blood type is A – and my wife’s is O+.. what would this make our daughters?
Added:
Cheryl Greene
Dear GF,
If one parent is A- and the other is O+, each of their children could be A+, A-, O+ or O-.
If you’d like an explanation, please let me know.
Best,
@MsGreene
Added:
jdc
i would like an explination
Added:
Yeo
My blood type is B+ and my wife is AB+.
My child is B-
Is it possible? What are the chances?
Added:
Cheryl Greene
Yeo,
Yes, it is possible for an AB+ parent and a B+ parent to have a B- child. In terms of odds, there is a 50% chance the child would be type B and a 6.35% chance the child would be Rh-.
Best,
@MsGreene
Added:
Jerricka
My father is B+ and my mother is A+ but im O- and my sister is O+ how is that possible?
Added:
Cheryl Greene
Hi Jerricka,
Each person has two alleles that determine blood type and type that determine Rh type. Here is how that looks:
A = AA or AO
B = BB or BO
O = OO
AB = AB
Rh+ = + + or + –
Rh- = – –
In the example you provide, if the father is BO+-, and the mother is AO+- they could each pass down an O allele so their child would be O (OO). In the case of an O- child they each has to pass down a – allele. In the case of an O+ child at least one of them passed down an + allele.
I hope that’s helpful,
@MsGreene
Added:
Jerricka
It is helpful thank you… I have a couple more questions. #1. Both of my kids are A+ (which obviously they received from their fathers) and i had to receive shots so my body wouldnt attack my children and when my blood mixed with my first child i developed antibodies in my blood and can no longer donate plasma because of it but noone ever explained why to me. Can you please explain if you know why i can no longer donate? #2. Would i ever be able to donate blood to family or my children if they ever need it being i have O- blood with antibodies? Would it affect me donating anything other than blood either?
Added:
Cheryl Greene
Jerricka,
Dr. Greene has written about How To Determine and Manage Rh Incompatibility. In that Q&A, he answers some of your questions. Unfortunately, I don’t have any additional insight, but perhaps others who read this will.
Best,
@MsGreene
Added:
Lewis Bramhall
Hi there,
My partner and I recently had a baby girl. My partners blood type is RH- O- and our childs blood type is RH+ O+. I was wondering if you could determine my blood type with the information of theirs. Just plain curiosity!
Thanks.
Added:
Cheryl Greene
Lewis,
If one parent is O- and the child is O+, the other parent could be O+, A+, or B+.
Let me know if you’d like an explanation.
Best,
@MsGreene
Added:
Kim davies
Hi my blood group is A neg and both of my kids are A neg like me but what blood group could my husband be thanks x
Added:
Cheryl Greene
Kim,
If one parent is A- and his or her children are A-, the other parent could be A+, A-, B+, B-, O+ or O-, but not AB+ or AB-.
Let me know if you’d like an explanation.
Best,
@MsGreene
Added:
alison
If I’m rhesus negative will my child be the same
Added:
Cheryl Greene
Hi Alison,
If a mother is Rh-, but the father is Rh+, the children can be either Rh+ or Rh-. Only if both parents are Rh- is it assured that the children will be Rh-. On the other hand, if both parents are Rh+ their children can be either Rh+ or Rh-.
Of concern, if the mother is Rh- and the father is Rh+, their may be an Rh incompatibility between the mother and the baby.
I hope that’s helpful.
@MsGreene
Added:
Jeevan
If father blood group A negative and mother blood gruop is A positive. Then child blood gruop is A negative. If possible?? Let me know
Added:
Cheryl Greene
Hi Jeevan,
If the father’s blood group is A- and the mother’s blood group is A+, each of their children can be A+, A-, O+ or A-.
If you’d like an explanation, let me know.
@MsGreene
Added:
confused
Hi Dr,I don’t know my blood group, but my husband is O+, my daughter is AB- and my son is AB+, so I concluded that my blood type is AB, is that possible?
Added:
Cheryl Greene
Confused,
According to our current understanding of genetics, a parent with type O blood can not have children who are type AB. For children to be type AB, one parent is either A or AB and the other is either B or AB.
In this situation, it would be wise to have your husband’s blood retested. It is likely different than what you believe it to be.
Best,
@MsGreene
Added:
Gebru Brhane
Dr. I am O negative and the mother of my baby is B plus what blood group could my baby be?
Am waiting your kind response
Added:
Cheryl Greene
Gebru,
If you are O- and the mother of your baby is B+, your baby could be O+, O-, B+ or B-.
If you’d like an explanation, please let me know.
Best, @MsGreene
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner and wife, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Aria
If the father is O- can the baby be O+
Added:
Cheryl Greene
Aria,
It is possible for a father who is O- to have a baby who is O+, if the mother is Rh+.
If you’d like an explanation, please let me know.
Best,
@MsGreene
Added:
Gozie
I am B+ and my husband is A- and I just tested my son and he’s O+…
is it possible?
Added:
Cheryl Greene
Hi Gozie,
Yes, it is possible for a father who is B+ and a mother who is A- to have a child who is O+. If you’d like an explanation, please let me know.
Of concern, if the mother is Rh- and the child is Rh+, there may be Rh incompatibility.
Best,
@MsGreene
Added:
Gozie
thank you so much for responding, but please if it isn’t a bother I need a bit of explanation.
I the mum is Rh+(B+) and my son is Rh+(O+) but the dad is Rh- (A-).
Added:
Kerry
Hi
I’m rehues negative my mother is not would my father be the same as me
Thanks kerry
Added:
Kerry
Hi so as my mother is not my dad has to be is that right
Added:
Cheryl Greene
Hi Kerry,
There was a typo in my reply to you (so sorry – I know this made it very confusing). I’ve corrected my error. The correct answer is both parent can be Rh+ and have a child who is Rh-. This means if you are Rh-, both parents could be Rh+.
Again, my apologies.
@MsGreene
Added:
Curious
If a mother is a+ and baby is o+ what would the father be?
Added:
Cheryl Greene
Curious,
If a mother is a+ and baby is o+, the father could be A+, A-, B+, B-, O+, or O-. He could not be AB+ or AB-.
Best,
@MsGreene
Added:
Shell
If Im blood type O+ and my daughter is A+ can her fathers blood type be A-
Added:
Cheryl Greene
Shell,
Yes, if the mother is O+ and the child is A+ the father can be A-.
If you’d like an explanation, let me know.
Best,
@MsGreene
Added:
Tina
Hi sorry but both my parents are dead now so can’t ask them. I am o+ and my sister o-, what’s the blood group possibilities of our parents, if we are meant to have the same Father please?
Added:
Cheryl Greene
Tina,
If two children are O+ and O-, and they have the same parents, at least one parent must be Rh+, but the other could be Rh+ or Rh-. Their blood groups can be A, B or O, but not AB.
If you’d like an explanation, let me know.
Best,
@MsGreene
Added:
Kelly
Hi if my mum is A- and my dad is 0+ is it normal to have the baby with 0 blood?
Added:
Cheryl Greene
Hi Kelly,
Yes, this is normal.
If you’d like an explanation, let me know.
Best,
@MsGreene
Added:
Amanda
Just had my baby boy yesterday 10/9 and found out he has O- blood im O + so that will make his father what blood type because my husband doesnt know his just curious to know
Added:
Cheryl Greene
Hi Amanda,
Congratulations! What an exciting time for your all.
If one parent is O+ and the child is O- the other parent can be A+, A-, B+, B-, O+ or O-, but can not be AB+ or AB-.
If you’d like an explanation, let me know.
Best,
@MsGreene
Added:
kool whip
Can a 0+ and a 0- make an A- baby
Added:
Cheryl Greene
Kool Whip,
Our current understanding of genetics is that it is not possible for one parent to be O+, the other parent to be O- and their child to be A-.
It is not uncommon for at least one person’s blood type to be different than what is thought. It’s wise to have blood types retested before jumping to any conclusions.
Best,
@MsGreene
Added:
John
Hi, my bloode type is b+ and my wife is o. Is it possible if my daughter has bloodtype A?
Added:
Cheryl Greene
John,
According to our current understanding of genetics, it is not possible for one parent to be B+, the other parent to be O, and their child to be type A.
Before jumping to any conclusions, it’s wise to have everyone’s blood retested. It’s not uncommon for one or more of the types to be different than what is thought.
Best,
@MsGreene
Added:
Jessica
If me and my son have the same blood type (a-) then does his dad have the same
Added:
Cheryl Greene
Hi Jessica,
No, this does not mean your son’s father has the same blood type.
If you and your son are both A-, his father could be A-, A+, B-, B+ O-, or O+. The father can not be AB- or AB+.
If you would like more of an explanation, let me know.
Best,
@MsGreene
Added:
Rc
I have AB blood type and my wife is O blood type, is it possible to have a O blood type child? If so can you explain please.
Regards,
Added:
Cheryl Greene
RC,
According to our current understanding of genetics, it is not possible for a parent with AB blood type to have a child with O blood type. It is possible for a parent with AB blood to have a child with A, B or AB.
I hope that’s helpful.
@MsGreene
Added:
Angie Atkinson
If mother is O+ and father is B- can the child have B+?
Added:
Cheryl Greene
Angie,
Yes, if one parent is O+ and the other is B-, they can have a child that is B+.
If you’d like an explanation, please let me know.
Best,
@MsGreene
Added:
Jenell
Hi doc, i have a question if a woman is married for a second time. Her first husband was blood type A and her son by that marriage was type O. Her new husband is type B and their child is type AB. What is the woman’s blood group ? .. Thank you sir for answering.
Added:
Cheryl Greene
Jenell,
In the scenario you suggest, the woman’s blood group is A.
Blood type is comprised of two alleles that we name A, B, O. Type A can be AA or AO, type B can be BB or BO, type O can only be OO.
Assuming all the blood types you cite are correct:
– The woman had AO and her first husband had AO. They each passed down the O allele and that child was type O.
– In her second marriage, the new husband was either BB or BO. He passed down the B and the woman passed down the A so their child was AB.
I hope that’s helpful,
@MsGreene
Added:
Gayashi
Father’s blood group O +,
baby’s blood group AB +
Is it correct? Father should O blood group can baby AB. Pls reply it can be happened.
Thanks
Added:
Cheryl Greene
Gayashi,
According to our current understanding of genetics, a parent with type O blood can not have a child with AB blood.
Please keep in mind that it is not unusual for blood types to be different than they are thought to be. Before drawing any conclusions, it’s wise to have everyone’s blood type retested.
Best,
@MsGreene
Added:
pavi
If the mom had B+ blood group then is it correct ?
Added:
Cheryl Greene
Pavi,
No. If either parent is type O, the child can not be AB.
Best,
@MsGreene
Added:
Stephanie Granberry
father is A+ , mother is B- , first child is O- and second is AB-, how is this possible. Thank you
Added:
Savannah
Hi Doc , I have O positive blood and so does my fiance would our baby have + or -?
Added:
Cheryl Greene
Hi Savannah,
If both parents have O+ blood, each of their children can be Rh+ or Rh-.
Let me know if you’d like an explanation.
Best,
@MsGreene
Added:
Michelle
If I am O- and my son is O- what blood type would the dad have?
Added:
Cheryl Greene
Michelle,
If one parent is O- and the child is O-, the other parent could be O- or O+.
Let me know if you’d like an explanation.
Best,
@MsGreene
Added:
Kim
Hi , if a mothers blood is A+ and the father is o- is it normal for the baby to be A-? I thought the o gene in fathers get passed on to the kid?
Thanks
Added:
Cheryl Greene
Kim,
Yes, it is normal for one parent’s blood type to be A+, the other to be O- and their child to be A-. They could also have children who are A+, O+ and O-.
Best,
@MsGreene
Added:
Ashish
I have a question..
If a husband and wife both have B+ blood group then their child will sure have B+ blood group or variation occours??
Added:
Cheryl Greene
Ashish,
If both mother and father have B+ blood, each of there children could have B+, B-, O+ or O- blood types.
Let me know if you’d like an explanation.
Best,
@MsGreene
Added:
Kazz
Hi if the mother is 0+ and the baby A+.. What type would the father have to be?
Added:
Cheryl Greene
Kazz,
If the mother is O+ and the baby is A+ the father would be A+ or A-.
Best,
@MsGreene
Added:
Crystal
Hello, I’m b- and the Father is O-.. What would be the blood type of our baby?
Added:
Cheryl Greene
Crystal,
If the mother is B- and the father is O-, each of their children could be B- or O-.
Women with Rh- blood have a risk of blood type incompatibility if their partner has Rh+ blood. The good news for you, is if you are Rh- and the father of your baby is Rh-, there isn’t an issue.
Best,
@MsGreene
Added:
Granny
If the mother and father both have O+ blood could they have a child with O- blood type????
Added:
Cheryl Greene
Granny,
Yes, it is completely normal for two parents with O+ blood to have a child with O- blood.
If you’d like an explanation, let me know.
Best,
@MsGreene
Added:
Beth
Hello,if the mother is o+ and father is o+. Could they have a child with o-?
Added:
Cheryl Greene
Hi Beth,
Yes, if both parents have O+ blood, they can have a child with O- blood.
If you’d like an explanation, let me know.
Best,
@MsGreene
Added:
Megan
Hello. I’m a little confused because I’ve been doing some research. I don’t know my mothers blood type, but I know mine is ab+ and my dad’s is o. Is this possible? Because from what I’ve read, it isn’t!
Added:
Cheryl Greene
Hi Meagan,
You are correct. Our current understanding of science is that it is not possible for one parent to be AB+ and a child that is O. An AB parent can only have children who are A, B or AB.
It is very wise to have all your blood retested. It’s not uncommon for blood types to be different than they are remembered.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Added:
Megan
Well, I’m ab+ for sure because I’ve donated blood and I have a card that states so. My grandparents are both of and so is my father. I’m not sure about my mother, but that’s what I was getting at, my father, if he is, haha shouldn’t be on? And what are the chances of the impossible being possible?
Added:
Rose
My bf is b- his son is b+ an his baby mom is o + could this be his son even if she took plan next morning
Added:
Cheryl Greene
Hi Rose,
If one parent is B- and the other is O+, they can have a child that is B+.
No birth control is 100% effective.
To determine if your bf is this child’s biological father, a DNA paternity test is in order. They are 99.999% accurate.
I hope that’s helpful.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Added:
Dionne
Hi doc
What could be my blood type if my mom’s blood type is AB+ while my dad’s blood type is 0+?
Added:
Cheryl Greene
Hi Dionne,
If one parent is AB+ and the other is O+, each of their children could be A+, A-, B+, or B-.
If you’d like further explanation, please let me know.
Best,
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Added:
Paul Thomasson Tveit
My mom is AB negative and I am O positive…
my brother of the same mother is O negative
I am not sure of my dads type but the three of us are known…
it has to be possible, because it is.:/
Added:
Paul Thomasson Tveit
lol she is B negative.:P
Added:
Cheryl Greene
Paul,
Mystery solved!
Thanks for letting us know.
Best,
@MsGreene
Added:
Cheryl Greene
Hi Paul,
Are you sure all the blood types are correct?
@MsGreene
Added:
bribe queen
Please I need clear explaination on if one parent is ab+ and other o+ their child B-Day.
Added:
Heather
My mom is o+ and my dad is a-, what would that make my blood type?
Added:
Cheryl Greene
Hi Heather,
If one parent is O+ and the other is A-, each of their children could be O+, O-, A+ or A-.
If you’d like an explanation, let me know.
Best,
@MsGreene
Co-founder & Executive Producer DrGreene.com
Added:
Corey
Question….I am A+ and my boyfriend is AB+ we have 2 boys… What might their blood type be….one more question…he is wondering if he has another child but her blood is O- could he be the father???
Added:
Cheryl Greene
Hi Corey,
If one parent is A+ and the other is AB+, each of their children could be A+, A-, B+, B-, AB+ or AB-.
A parent who is AB+ can not have a child who is O+ or O-.
If you’d like an explanation, let me know.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Added:
Ariel bohanan
If I have rh- blood and I am the mother , and my child has O+. What blood type could the father possible have to be my kids father? One says he’s O+, so is he the father ?
Added:
Cheryl Greene
Ariel,
If your child is O+ and you are A-, B- or O-, the father could be O+.
If you are A-, B- or O-, the father could also be A+ or B+.
Basically, in this situation, if you really want to determine who the father is, you’ll need a DNA paternity test because there is no one type of blood that would result in a child who is O+.
Sorry I can’t be more helpful.
Best,
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
P.S. I assume your doctor discussed your blood type incompatibility issues?
Added:
Alyssa
Hello, i have O postive blood type rh positive, my husband has AB positive blood
Our Daughter has O positive
And when our son was born he had to go under the light because they said something about ABO factor?
Whats that mean?
Added:
Joella
Hello. So my dad is O- and my mom is A+ but I’m B+?? That isn’t possible is it?
Added:
Cheryl Greene
Joella,
Our current understanding of science is that it is not possible for one parent to be O-, the other parent A+ and a child that is B+. An A+ parent can only have children who are A+, A-, O+ or O-.
It would be wise to have all your blood retested. It’s not uncommon for blood types to be different than they are remembered.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Added:
Jennifer Flynn
Is there a possilbity that O- male and a AB+ female have a A- child
Added:
Cheryl Greene
Hi Jennifer,
Yes, it is possible for one parent to be AB+, the other to be O- and their child to be A-.
If you’d like an explanation, let me know.
Best,
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Added:
Mohammad Rafiq
If father and mother both has blood group A- then what would be there children’s blood group
Added:
Cheryl Greene
Hello Mohammad,
If both parents are A-, each of their children could be A- or O-.
Let me know if you’d like an explanation.
Best,
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Added:
lorraine
Both my parents are O I think one is – and one + I am A+ and pretty sure this should not be the case but is it possible for two O blood group parents to have an A baby? At all?
Added:
Cheryl Greene
Lorraine,
Our current understanding of science is that it is not possible for one parent to be O-, the other parent O+ and have a child that is A+. If both parents are O, all their children will be type O.
It’s very wise to have all your blood retested. It’s not uncommon for blood types to be different than they are remembered.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Added:
Katrina Nadminty
Hello I am B+, my husband is O+ what blood type will my son be. Thank you
Added:
Cheryl Greene
Katrina,
If one parent is B+ and the other is O+, each of their children can be B+, B-, O+ or O-.
If you’d like an explanation, let me know.
Best,
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Added:
Kathy Lunt
I’m A negative…neither my mother or father is A or negative..can this happen?
Added:
Cheryl Greene
Kathy,
Our current understanding of science is that it is not possible for a child to be A if neither parent is type A. It is possible to be Rh- if neither parent is Rh-, though.
In your situation, it would be wise to have all your blood retested before jumping to any conclusions. It’s not uncommon for blood types to be different than they are remembered.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Added:
Kathy Lunt
Thank you…this was a comment my mother made after I became an adult, saying she didnt know how i could be A- when neither she nor my fathet were either.
Added:
Cheryl Greene
Perhaps she meant neither of them were A-. Perhaps one of them was O+ and the other A+. It would then be possible for their child to be A-.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Added:
Terboyen Zak
Hello Dr, I am O+ and so is my wife can we have children?
Added:
Cheryl Greene
Terboyen,
There is no reason, based on blood type, that two O+ parents can not have healthy children.
Best,
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Added:
S. Wilson
The only issue comes when one parent has a negative rh and one a positive, e.g. Mom is A – and dad is A +, then you risk the baby being a pos Rh type that could cause complications during later pregnancy if somehow, (there’s always a chance but as the mother and infant do not share blood systems, the issue would probably occur in later pregnancy, or delivery) the baby’s blood were to enter the mother’s system, the mothers body would attempt to create antibodies to fight against the baby’s blood. However, there are ways to reduce risks and have a fairly healthy pregnancy and a completely normal baby. It is important to let your ob/gyn know at your first check up if the parents have different rh types so that he/she will be prepared for any future complications. They will most likely do a shot called Rh immunoglobulin (RhIg) that basically prevents the mom from developing antibodies against the baby. If you’re concerned, talk to an ob/gyn, they deal with this stuff all the time.
Added:
Cheryl Greene
S.
To be clear, it is not an issue when the father is Rh- and the mother is Rh+. Only when the mother is Rh- and the father is Rh+.
Dr. Greene explains in How To Determine and Manage Rh Incompatibility.
Best,
@MsGreene
Added:
Abdul Razak
Hi Dr, my wife and i belong to blood group O can we have children? Thank you.
Added:
Cheryl Greene
Abdul,
O is the most common blood type. The only issue with two people with type O blood having children is if the mother is O- and the father is O+.
Dr. Greene addresses this issue in the Q&A How To Determine and Manage Rh Incompatibility.
I hope that’s helpful,
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Added:
Sue
If mother is A- and father B- can baby be O+
Added:
Cheryl Greene
Sue,
No, if one parent is A- and the other is B-, they can not have a child who is O+. They can have a child who is O-, but not O+. If one of the parents is Rh+ and the other is negative, the child can be Rh+.
In this case, it would be very wise to have the blood types retested. It would be very easy for one of the types to be different than people remember.
Best,
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Added:
martin
if the mother was o-
and her son is o- is it possible for daughter to be ab-?
Added:
Cheryl Greene
Martin,
Our current understanding of science is that it is not possible for a parent who is O- or O+, to have a child that is AB- or AB+. An O parent can only have children who are A, B or O.
It would be wise to have mother and AB child’s blood retested. It’s not uncommon for blood types to be different than they are remembered.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Added:
ali
I have ab- my wife have o+ is possible we have child with o- or not possible plz reply thanks or its wrong test of our baby blod
Added:
Cheryl Greene
Ali,
Our current understanding of science is that it is not possible for one parent to be AB-, the other parent O+ and a child that is O-. An AB parent can only have children who are A, B or AB.
Very wise to have all your blood retested. It’s not uncommon for blood types to be different than they are remembered.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Added:
ali
But sir i read some way that if one Parent have abo blod and other have o blod then they can have o blod baby. And that is normally happen in India or Asia I m from Pakistan what is different in ab- blod and abo how can I test my bold
Added:
Cheryl Greene
Ali,
I am not a doctor (Dr. Greene is a different person, I am MsGreene). I do not know about a blood type ABO, only A, B, AB and O. Can someone else help shed light on this?
Best,
@MsGreene
Added:
Bawi Kim
Both my parents are AB blood type, what will be mine then?
Added:
Cheryl Greene
Hi Bawi,
If both parents are AB, their children can be A, B or AB, but not O.
Best,
@MsGreene
Added:
daris
I have my blood group group A- and my father and mother have A+ can it be possible
Added:
Cheryl Greene
Daris,
Yes, this is possible.
@MsGreene
Added:
Judy Ammons
I am A- what would my father’s blood type be?
Added:
Cheryl Greene
Hi Judy,
If you are type A-, depending on what type blood your mother has, your father could be A, B, AB or O. He could also be + or -. This is not the case with every blood type combination. For instance, if you were type O, he could not be type AB, no matter what type blood your mother has.
Best,
@MsGreene
Added:
Helen
I’m o- what would my parents have to be?
Added:
Cheryl Greene
Helen,
As it turns out, that is one blood type that could have one or both parents from A+, A-, B+, B-, O+ or O-. The only blood type your parent can not have is AB+ or AB-.
If you’d like an explanation, let me know.
@MsGreene
Added:
Paul Thomasson Tveit
this can’t be true.. my brother IS O- and our mother IS AB –
I am O+, myself…?
Added:
Paul Thomasson Tveit
lol Mom is B negative.:P
I misremembered…I guess… memory is a fickle thing I guess.:P
Added:
Cheryl Greene
Paul,
Thanks for sharing and this is a great example of how often people are sure they know blood types and one of them is different than what they thoughts. Sometimes this is due to a lab error, or a reporting error, or as you point out, memory is a fickle thing.
Thanks again,
@MsGreene
Added:
Cheryl Greene
Paul,
If you are correct, call the New York Times. You’re making history! Or perhaps your mother’s blood type is different than you think?
Best,
@MsGreene
Added:
Helen
Can myself as the mother having O+ blood type make A+ baby with one guy has ab+ and other has ab- which one could be father?
Added:
Cheryl Greene
Helen,
In this case, blood type alone can’t rule out either man.
DNA paternity testing, which is 99.999% accurate would be needed to determine paternity. You can do these tests at home. Here’s one example. It’s low priced, but not legally binding. This test legally admissible.
I hope this is helpful,
@MsGreene
Added:
Mimi
Hello, please I’m O+ and my husband B+. Is it possible that our child could be AA or A+?
Added:
Cheryl Greene
Mimi,
Our current understanding of science is it is not possible and one parent to have O+ blood, the other to have B+ blood, and their child to have A+ blood.
It would be wise to have everyone retested. One of the blood types may be different than you think.
Best,
@MsGreene
Added:
Seema
Hi Doctor
I am AB + and husband is B+ We have 3 children oldest has AB+
Middle one is B+ youngest is ,A+
Can you explain what does my younget one has A +
Added:
Cheryl Greene
Hi Seema,
Yes! I can explain.
If a person is AB+ he or she has one A and on B allele and can pass down either an A or a B to each of his or her children.
If person is B+ he or she has either two B alleles or a B and an O allele. In the example you provide, we can determine that the father has a B and an O allele so he can pass down either a B or an O.
Oldest child get A from mom and B from dad = AB
Middle child gets B from mom and B from dad = B
Youngest child gets A from mom and O from dad = A
Make sense?
@MsGreene
Added:
Honey
Can Seema AB+ and her husband B+ have a baby with O+?
Added:
Cheryl Greene
Honey,
Our current understanding of science is that it is not possible for one parent to be AB+, the other parent B+ and a child that is O+. An AB parent can only have children who are A, B or AB. However, it’s not uncommon for blood types to be different than they are remembered. It would be prudent to have all three blood retested.
@MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Added:
Asiog
My blood type is O+ my parent’s are O+ and my sister is B+ how is that???
Added:
Cheryl Greene
Asiog,
Our current understanding of science is that it is not possible for two parents with O+ blood to have a child with B+ blood.
Before you jump to any conclusions, it’s wise to have everyone’s blood retested. The types may be different than what you think they are.
@MsGreene
Added:
gabby
my mother is A+ and my father is O- and I’m A-. my boyfriend’s father is O+ and his mother is A+ and my boyfriend is O+ and our child is A- can you explain our blood types
Added:
Cheryl Greene
Gabby,
Maternal Grandmother = A+ which is either AA or AO and ++ or +-
Maternal Grandfather = O- which is OO and – –
Child = A- who got an A from mother, an O from father and negative from each
Paternal Grandmother = A+ which is either AA or AO and ++ or +-
Paternal Grandfather = O+ which is OO and either ++ or +-
Child = O+ who got O from each parent and a + from at least one parent (O+ can be OO++ or OO+-)
Mother = A- which is either AA or AO and – –
Father = O+ which is OO and can be either ++ or +-, but we assume is +- based on child’s outcome
Child = A- which A from mother, O from father and – from both
Cheers,
@MsGreene
Added:
gabby
thank you very much
Added:
Rebecca R
Hi
My father is o +
My mother is A+
I am resus A negative is this possible please
Thank u
Added:
Cheryl Greene
Rebecca,
Yes, this is possible.
Let me know if you’d like an explanation.
@MsGreene
Added:
Vhan
Hi. Im sure im not O but i cant remember if im a positive or negative B. My dad’s B+ while mom is O.
Added:
Cheryl Greene
Vhan,
If one parent is B+ and the other is O, it is possible for their child to be B+, B-, O+ or O-.
@MsGreene
Added:
Erika
I am B positive my boyfriend is B positive why is my son B negative?
Added:
smile
My dad is O- am B-(female), my two younger brother’s are A- and 0-…pls what could my mum blood group
Added:
Cheryl Greene
Hi Smile,
If one parent is O- and his or her children are B-, A- and O-, the other parent of the children who are B- and O- would be B+ or B-, the other parent of the children who are A- and O- would be A+ or A-.
Before you jump to any conclusions, it’s wise to have everyone’s blood retested. It’s not uncommon for one of the blood types to be different than what you all think it is.
Best,
@MsGreene
Added:
smile
Ok…..
So it means it z possible for a couple to av kids wif 3 different blood groups.
Added:
Cheryl Greene
Smile,
It is possible for some parents to have children with three (or even four) different blood groups. For instance if one parent is blood group A, the other is blood group B, they can have children who are A, B, O or AB.
Best, @MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner and wife, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Rashida
My blood type is B+ and my husband blood type is A+
What will be my son’s blood type A+ B+ or AB+
Added:
Cheryl Greene
Rashida,
If one parent is B+ and the other is A+, each of their children could be A+, A-, B+, B-, AB+, AB-, O+ or O-. As you can see, this combination of parents offers the greatest possible outcomes.
If you’re interest in an explanation, let me know.
@MsGreene
Added:
NleeM
My blood type is AB+. I have a sister A+ and another sister O+. My parents are deceased but I thought my father was O+ – is that possible and what might my mother have been? If my father was not really O+ what possible blood types could my parents have been in view of children being AB+, A+ and O+?
Added:
Cheryl Greene
NleeM,
If three siblings are AB+, A+ and O+ one parent could be A+ or A- and the other could be B+ or B-.
If you’d like an explanation, let me know.
Best,
@MsGreene
Added:
Cody
In this article you mention that having parents that are type (a) and one type (b) can produce all other blood types. However on the redcross site it states I can only be (a) or (o). Can somebody clarify this for me? Thx.
Added:
Cheryl Greene
Please send a link to the Redcross page where you saw this result.
Added:
Danial
Hi Dr,
My blood group is ABRh+ and my partner’s blood group is B+. We are very curious to know all the possible and impossible blood groups and the “Rh” that our children may have.
Regards,
Danial
Added:
Cheryl Greene
Daniel,
If one parent is AB+ and the other is B+ their children can be B+, B-, A+, A-, AB+ or AB-. They can not be O+ or O-.
Cheers,
@MsGreene
Added:
Becky
Hi if I am A Resus Negative blood is it possible to have both parents O positive
Added:
Cheryl Greene
Hi Becky,
Our current understanding of science is that it is not possible for two parents who are O+ to have a child who is A-.
It is not uncommon for one of the three blood types to be different than thought, so it is wise to talk to your parents about having everyone’s blood type re-tested before jumping to any conclusions.
Best,
@MsGreene
Added:
Jessica
Dear Dr. If I am o positive and my husband is ab positive what blood type could our son be
Added:
Cheryl Greene
Hi Jessica,
If one parent is O+ and the other is AB+, their children can be A+, B+, A- or B-.
Let me know if you’d like an explanation.
Best,
@MsGreene
Added:
Ar anne
Why AB is cant? And O?
Added:
Nicola
Hi,
My Mother is blood type A and my father is O . But I’m a B Positive and my younger sister is O type same as my father .
I read on here that A and O type is impossible to have a B Positive child . If this is correct ,it could mine that my father is not my biological father after all .
Really confused
Thank you .
Added:
Cheryl Greene
Hi Nicola,
Our current understanding of science is that it is not possible for a parent who is A and a parent who is O to have a child who is B.
It is not uncommon for one of the three blood types to be different than thought, so it is wise to talk to your mother about having everyone’s blood type re-tested before jumping to any conclusions.
Best,
@MsGreene
Added:
Nicola
Thank you for your Advice .
I have had my bloods done four times ,due to having my babies . So I do know that my blood group B Pos is correct
Maybe one of my parents blood group is wrong .
Thank you again
Added:
Stela
Me and my partner are o positive, and my child is a+ is that possible?
Added:
Cheryl Greene
Stela,
Our current understand of the science is two O+ parents can only have children who are O+ or O-.
It is not uncommon for blood tests to be in error or to be recorded in error. It’s wise to have all three types re-tested before drawing any conclusions.
Best,
@MsGreene
Added:
Josie
Im just wondering im ab postive and my mum is a postive dad is b postive but no other sibling seems 2 know why im ab postive cause there either a or b . Confused
Added:
Cheryl Greene
Hi Josie.
Each individual has two alleles that comprise their blood types. The most common are A, B and O.
— If a person is type A, he or she can be AA or AO.
— If a person is type B, he or she can be BB or BO.
— If a person is AB, he or she is AB.
Every child get one allele from each parent. In the example you give:
— One parent contributed an A and the other a B, so the child is type AB.
— One parent contributed an A the the other an O, so the child is type A.
— One parent contributed a B and the other an O, so the child is type B.
— If (which is not in your example) both parents contributed an O, the child would be type O.
In other words, if one parent is type A and the other is type B, they can have children who are A, B, O or AB.
Does that clear up your confusion?
@MsGreene
Added:
Lala
Is it possible that my child is B+ and me and his father is O+? Is there any instances that already happened?
Added:
Cheryl Greene
Lala,
I’m not aware of an instance where that has happened.
Have you confirmed test results?
@MsGreene
Added:
Andrea
Hello, I am O+, my daughter is A- and I am trying to figure out my son’s blood type. My husband doesn’t know his own. What are the possibilities for their blood type? Thank you in advance!
Added:
Sasha
Hi, Dr. Greene I am O+ and my mom is Rh-. Is there any concern here because I bleed alot when I go to the dentist for an extraction or menstrual cycle.
Added:
NB
My blood type is A+ and my husband’ blood type is B- .Our son has A- blood.. Is my husband my son’s dad?
Added:
Cheryl Greene
NB,
In this example: mother A+, probably father B-, child A-, the blood type does not rule out that the probable father is the father. Nor does it prove that he is the father.
DNA paternity testing is 99.99% accurate and can be done at home.
I hope that helps,
@MsGreene
Added:
anita
Mother is 0- and father is 0+ and child is B+, is it possible?
Added:
Cheryl Greene
Anita,
According to our current understanding of science, a parent with O- blood and a parent with O+ blood can only have children who are either O+ or O-.
Of concern, in the example you provide is the mother is Rh- and the child is Rh+. If this is the situation, the mother needs medical treatment before conceiving again. Dr. Greene explains in his Q&A How To Determine and Manage Rh Incompatibility.
Best,
@MsGreene
Added:
Husny
Dear doctor,
My blood type is AB while my moms bloodtype is O and my dads bloodtype is B and i’m their biological daughter. How is that possible?
Added:
Cheryl Greene
Husny,
Our current understanding of science is that a person with AB blood can not be the biological child of a person with type O blood.
However, it is not uncommon for one of you to have a different blood type than you think you have. This can be because the blood type test was in error, it was recorded incorrectly, or someone remembers it differently than was reported. In any case, it’s wise to have the child with AB blood and the parent with O blood retested.
I hope that is helpful,
@MsGreene
Added:
Angel perlas
My both parents are type O but one of the siblings is type AB? Can it be possible?
Added:
Cheryl Greene
Angel,
According to our current understanding of science, if both parents are type O, and the child is AB, neither of the parents are biological parents.
Options — have everyone’s blood type retested, have a conversation about biological vs adoptive parents, remain silent. All are valid responses.
Best,
@MsGreene
Added:
Pam
If I am ABt can I have a parent AB t
Added:
Cheryl Greene
I am unfamiliar with “t” in blood type distinction, but assuming it is either + or -, the answer is, yes.
If one parent is AB+ or AB- s/he can have a child who is the same type IF the other parent is either A, B or AB, but not if the other parent is O.
If you’d like to clarify the meaning of “t”, I can answer more fully.
Best,
@MsGreene
Added:
Dr:Kayla
It’s Not normal if parents blood group is Orh+ but the child blood group is Orh-
Dr:Kayla
Added:
James
If a mother blood type is Orh+ and the father blood type is also Orh+
But child was Orh- is it possible?
Added:
Cheryl Greene
James,
Yes, this is possible. If you’d like an explanation, let me know.
Best,
@MsGreene
Added:
ashley Brumbaugh
I am O + my baby is also o+ can her dad be a+
Added:
Cheryl Greene
Ashley,
Yes, that is a possible combination. In fact, that’s a common outcome.
Best,
@MsGreene
Added:
Niki
Hi I am O+ and my partner is AB- I wanted to know what precaution measures to be taken during pregnancy ??
Added:
Cheryl Greene
Niki,
The issue of blood type incompatibility is if the mother is Rh- and the father is Rh+. There is no issue if the mother is Rh+ and the father is Rh-.
Dr. Greene explains this fully in his Q&A How To Determine and Manage Rh Incompatibility.
Best,
@MsGreene
Added:
Niki
Thank u sir . I guess no incompatible issue
Added:
Mary
If mother and father are both 0+ will baby be same
Added:
Cheryl Greene
If both parents are O+, each of their children can be either O+ or O-.
Best,
@MsGreene
Added:
Amanda
Hi Dr, I am O – and my husben is either O+ Or O- What would my baby blood type would be ? Can the baby carry my blood type or only the father ?
Added:
Cheryl Greene
A baby’s blood type is comprised of half from the mother and half from the father.
If one parent’s blood type is O- and the other’s is O+, their children can be either O+ or O-. If one parent’s blood type is O- and the other’s is O+, their children can be either O+ or O-.
The concern in the example you give is if a woman has Rh- blood and her partner has Rh+ blood, there is a incompatibility issue that needs to be addressed. Dr. Greene discusses it in his Q&A How To Determine and Manage Rh Incompatibility.
Best,
@MsGreene
Added:
Frost
If my son AB+ the mother is A- I do not currently know my blood type. My mother is B+ and my father is O+. What could my blood type be?
Added:
Cheryl Greene
If a child is AB+ and one parent is A-, the other parent is B+.
Hope that helps,
@MsGreene
Added:
Anju
I’m A+ and my husband is Ab- will there be any prblm wid the child??.
Added:
Cheryl Greene
There are not health issues associated with the blood types of a mother who is A+ and a father who is AB-. The health issues from blood type imcompatibility are associated with a mother who is Rh- and a father who is Rh+.
Best,
@MsGreene
Added:
Lucy
Hi Dr Green,
Mum A-
Dad A +
What could the children be please?
Added:
Cheryl Greene
Hi Lucy,
If one parent is A- and one parent is A+, each of their children could be A+, A-, O+ or O-.
Of concern, if the mother is Rh- and the father is Rh+, the mom needs to be treated for potential blood type incompatibility. Dr. Greene discusses why and how in his Q&A How To Determine and Manage Rh Incompatibility.
Best,
@MsGreene
Added:
Curious Me
The article was very helpful thank you. I was a little lost on our situation though, as it looks like many are.
I am a B+ my husband is an A+
Our oldest is A+ and our youngest is AB- I guess I’m just wondering where/how the – came in. Super cool to find out we could potentially have a little O baby.
Added:
Curious Me
Yes, it does. Thank you so much for taking the time :)
Added:
jo
If I’m o rhesus negative and my mums o positive what blood group should my dad be
Added:
Cheryl Greene
If one parent is O+ and the child is O-, the other parent can be A/B/O, but not AB. The second parent can be Rh+ or Rh-.
Hope that helps,
@MsGreene
Added:
jo
Thanx you very much yes it has helped
Added:
chantall
Dear Dr Green. Can a O+ mother and an A- father have an O+ child
Added:
Cheryl Greene
Chantall,
Yes, an O+ mother and an A- father have an O+ child.
If you’d like an explanation, let me know.
Best,
@MsGreene
Added:
Raj
Dad B+ and mother B+ but son is o+ it is possible
Added:
Cheryl Greene
Raj,
Yes, this is a possible outcome.
Let me know if you’d like an explanation of how this works.
Best,
@MsGreene
Added:
Sya
Hi doc.
I am AB and my husband is B. But my third son is O. I need explaination because its imposible to us having child with O type. But my husband’s mother is O. Need your explaination. Thank you
Added:
Cheryl Greene
Sya,
If you are really AB (you should be retested to confirm) you can only pass down an A or a B. This means none of your children can be O. If your husband is type B, he could pass down B or O, but a child with type O has an O from both parents. If the blood types you state are all accurate, he could be your husband’s son, but he could NOT be your son.
Hope this helps,
@MsGreene
Added:
Rob
My blood is O+ and my wife is O – what will my child be?
Added:
Cheryl Greene
Rob,
If one parent is O+ and the other is O- their children will be O+ or O-.
It’s wise to be aware that there is an issue of concern in the situation where the father is Rh+ and the mother is Rh-. Dr. Greene discusses this in his Q&A How To Determine and Manage Rh Incompatibility. If you are not already well versed on this topic, please read his Q&A.
Best,
@MsGreene
Added:
Heila
Hallo,
Dad is O+ and mom is O-. Can the child be A+?
Added:
Cheryl Greene
Hi Hella,
Our current understanding of the science of genetics is it is not possible for toe parents with type O blood to have a child with type A blood.
Before jumping to conclusions, retesting my is wise.
@MsGreene
Added:
Heila
Thank you
Added:
Reco
Hi im o- and my wife is o+ can oir child be any other blood group
Added:
Cheryl Greene
According to our understanding of the current science, two parents with type O blood can only have children with type O blood. If one parent is Rh+ and the other is Rh-, the children can be either Rh+ or Rh-.
Best,
@MsGreene
Added:
Amaan
This post was really helpful. Thanks.
I have B+ and my wife is A+. Our new born girl is O-… Is it normal?
Added:
Cheryl Greene
Amaan,
Yes, it is normal for one parent to be A+, the other to be B+, and their child to be O-.
If you’d like an explanation of how that can happen, let me know.
Best,
@MsGreene
Added:
Karen
Is there a Dna test to discover if parents were really siblings?
Added:
Cheryl Greene
Karen,
Yes, there are DNA tests that can check to see if two people are siblings. Here is one example*. This one is not legally binding, but I think you are just trying to find out, and there is no court case involved.
*Note: the test I linked to is not reviewed, it is just an example of what is available.
Hope that helps,
@MsGreene
Added:
Kerry
My blood type is A and my husbands’ is B. My baby has O … does this match with us?
Added:
Cheryl Greene
Kerry,
Yes, if one parent is A and the other is B, they can have a child who is O.
Let me know if you’d like an explanation of how this can happen.
Best,
@MsGreene
Added:
Joy
My father has B+, my mother has A+. I am a boy have AB-. Is it ok?
Added:
Cheryl Greene
Yes, it is very normal for a B+ parent and an A+ parent to have an AB- child. No worries.
Best,
@MsGreene
Added:
Venessa
Hi. Both my girls are Type A+ and my step daughter is A-
My blood type is O- my Step daughter’s mom is also O-
What blood type would their father be?
Added:
Cheryl Greene
If two children have A+ blood and one child has A- blood and they all have the same father, and all of them have a mother who is O-, the father would be A+.
If you’d like further explanation, please let me know.
Best,
@MsGreene
Added:
Helen
Can a o+ and ab+ make A+baby?
Added:
Cheryl Greene
Helen,
Yes, if one parent is O+ and the other is AB+ they can have a child who is A+.
Let me know if you’d like an explanation.
@MsGreene
Added:
Jane
If both parents are B+ do all kids have to be B+or O+?
Added:
Cheryl Greene
If both parents are B+, they can have children who are B+, B-, O+ or O-.
Best,
@MsGreene
Added:
Terry
Can Type B and O Positive have Rh O negative child??
Added:
Cheryl Greene
Yes, if one parent is B+ and the other is O+, they can have an O- child.
If you’d like an explanation, let me know.
Added:
Love
Pls I would like an explanation on this
Added:
Nikki Gloom
ok A man and a woman have a child. she is AB- he is O what would the variables be of blood type. can it also be AB-?
Added:
Cheryl Greene
Hi Nikki,
If one parent is AB-, that parent can pass down an A or a B, but can only pass down a – (if someone is Rh- it means he or does not have the D antigen). If someone is O, that parent can only pass down an O (if someone is blood type O, both alleles are O). If this situation, their children can be:
AO, which is called simply A
BO, which is called simply B
Their children can not be:
OO
AB
If the parent with type O blood is +, their children could be:
A+
A-
B+
B-
If the person with type O blood is – (and the other parent is AB-) their children could be:
A-
B-
I hope that’s helpful.
Best,
@MsGreene
Added:
Christal
Hi there! I would like to know what if me and my partner have same blood group type B, will we have a normal baby or is there likely a risk/advice not to have babies?
Added:
Cheryl Greene
Christal,
The issue with blood type incompatibility comes, not from the A,B,O type, but the Rh factor. If the mother has Rh- blood and the father has Rh+ blood, there may be an issue for children after the first child. Dr. Greene explains this in-depth in his answer How To Determine and Manage Rh Incompatibility.
Best,
@MsGreene
Added:
Kylei
Hi! If im type O positive and my husband is type AB positive, can we have a type O positive baby? Thanks
Added:
Cheryl Greene
Kylei,
Our current understanding of the latest science would say it is impossible for a parent with AB blood type to have a child with type O.
Before jumping to any conclusions, consider having all three parties blood types retested. It’s not uncommon for the test to be in error or for the test results to be recorded in error.
Best,
@MsGreene
Added:
Kylei
Thanks for the reply, my friend ask if both parents are type O positive what will be the possible blood type of their upcoming baby, thanks again, God bless!
Added:
Cheryl Greene
If both parents are O+ their children will be O+ or O-.
@MsGreene
Added:
Mish
If mother is O positive and the 2 children are blood types O positive and A negative, what would their fathers blood type be?
Added:
Cheryl Greene
Hi Mish,
If a parent is O+ and has one child who is O+ and the other who is A- with the same partner, the partner could be either A+ or A-.
If you would like further explanation, let me know.
Best,
@MsGreene
Added:
Bob
Is it possible for me to father my ex wife’s son I had a vasectomy six years ago. Her son is now 18 months and he looks a lot like are son. (Who looks alot like me) My ex wife’s blood type is 0-, the other guy is A+ and I’m B+ and my ex wife’s son is B+.. Is it possible for me to be the father of her son??
Added:
Cheryl Greene
Bob,
Based on blood types and our current science:
— If one parent is O- and the other is A+, they can not have a child who is B+
— If one parent is O- and the other is B+, they can have a child who is B+
DNA paternity testing like this one, is much more precise than blood type alone.
Hope that’s helpful.
@MsGreene
Added:
Lynn
Is it possible for a O negative mother and A positive father to have a B positive baby
Added:
Cheryl Greene
According to our current understanding of the latest science, it is not possible for an O- parent and an A+ parent to have a B+ (or B-) child.
Best,
@MsGreene
Added:
Bev
Can an A possitve mother and O negative father have a Rh A negative baby ?
Added:
Mary
Thanks for adding this to your initial overview. It is an excellent explanation of why I am O- and my daughter is O+.
Added:
Ahmed
If my mama is Ab and my baba is BA what’s my blood type? Please help its urgent
Added:
Cheryl Greene
I’m not sure I understand your question, but what I think you are saying is there is a grandmother with AB and a grandchild with BA (which is known as AB — they are the same thing) blood types. What is the blood type of the child of the grandmother who is also the parent of the grandchild? If that is correct, the blood type is A or B.
I hope that’s helpful.
Added:
Cindy
Can an A+ mom and an O- father have an A – child
Added:
Cheryl Greene
Hi Cindy,
Yes, an A+ parent and an O- parent can have an A- child.
Let me know if you’d like further explanation.
Best,
@MsGreene
Added:
Cindy
I would love an explanation
Added:
Reynald
If Im B+ and my wife is O rh + what type of blood my kids should be.
Added:
Cheryl Greene
Hello Reynald,
If one parent is B+ and the other is O+, each of their children can be:
B+
B-
O+
O-
Let me know if you’d like more information about how this is determined.
Best,
@MsGreene
Added:
Sachin
My blood group is B positive, my wife blood group is A positive.
What is my child”s blood possibilities? Please, urgent
Added:
Cheryl Greene
Sachin,
If one parent is B+ and the other is A+, each of their children could be:
AB+
AB-
B+
B-
A+
A-
O+
O-
As with the your previous question, about one parent who is B- and the other who is A+, all these types are possible.
See Dr. Greene explanation above for the details of how this can happen.
Best,
@MsGreene
Added:
Sachin
My blood group is B negative, my wife blood group is A positive.
What is my child”s blood possibilities? Please, urgent
Added:
Cheryl Greene
Sachin,
If one parent is B- and the other is A+, each of their children could be:
AB+
AB-
B+
B-
A+
A-
O+
O-
Dr. Greene explains how this can be in the article above.
Best,
@MsGreene
Added:
Alli
I am AB positive but my mother is B and my dad is O is it possible for my father to be my real father?
Added:
Cheryl Greene
Alli,
According to our understanding of the latest science, a B parent and an O parent can’t have an AB child.
That said, tests can be in error or recorded in error. Before jumping to any conclusions, it’s wise to have everyone retested.
DNA paternity tests are even more sensitive and can give further information.
Best,
@MsGreene
Added:
July
my father is O- my mother is A + and i am B+ they tell me that my father is my real father is that true i don’t care but would like to know
Added:
Cheryl Greene
It sounds like it would be wise for all three of you to be retested. If he is your father, one of the tests is in error or was recorded in error.
Added:
sil
my father is O negative and my mother is A positive i am B positive i’ve been told that he cant be my father is that true im grown i dont care but would love to know
Added:
Cheryl Greene
Hi Sil,
According to our understanding of the current science, an O- parent and an A+ parent can’t have an B+ child.
Before you jump to any conclusions, it’s wise for everyone to be retested. It’s not uncommon for a test to be in error or recorded in error.
Best,
@MsGreene
Added:
Celestina Kimberley B.
Dr. Greene, my sister has an O+ blood group and her boyfriend has the blood group B-. Are they able to have children? Is it safe to have children?
Added:
Cheryl Greene
Hi Celestina,
Dr. Greene addresses that question in his Q&A How To Determine and Manage Rh Incompatibility.
Best,
@MsGreene
Added:
Tushar
father blood group Ab+ and mother blood group A+ then poosibale to child blood group O+????
Added:
Cheryl Greene
A person with AB+ blood can pass down either an A or a B and either a + or a – (negative is recessive, so someone who is +- is still called +). He or she can not pass down an O. A person with type A+ blood can pass down an A or O ( the O is recessive so someone with AO blood is still called A).
In the example you provide, AB+ and A+ can not have an O+ child.
Please keep a few things in mind. We are constantly learning new things and understanding science in new ways. We may find out one day that this is possible and we just didn’t know it.
Also, it’s not uncommon for a blood type test to be in error or to be recorded in error. It’s wise to have everyone in the family retested before jumping to any conclusions.
Best,
@MsGreene
Added:
Tushar
Father blood group B+ and mother blood group A+ then poosibale to child blood group O+??
Added:
Cheryl Greene
Tushar,
Yes, it is possible for one parent to be B+, the other to be A+ and their child to be O+.
Each person has two alleles that make up their A, B, O blood type. A and B are dominant and O is recessive. A person who has type A blood can be AA or AO. A person who has type B blood can be BB or BO. If both parents contribute the O allele, their child will be OO, which is known as type O.
Hope that’s helpful.
Best,
@MsGreene
Added:
PandiriRajanipandiri
Father blood group “A positive”
Mother blood group “O positive”
But baby boy born with the blood group was—- “A negative”
Is it possible?
Added:
PandiriRajanipandiri
Thank you Mr Greene
Added:
Cheryl Greene
You are most welcome.
Added:
cor
my mother is Type B and my father is type O negative My blood type is b positive ,what does it means? it is not possible thanks…
Added:
Cheryl Greene
If one parent is Rh+, their children can be Rh+ or Rh-. If one parent is type B and the other is O, their children can be type O or B.
Hope that’s helpful,
@MsGreene
Added:
Lisa
I’m AB the neg. Partner is B positive why is my baby O neg
Added:
Cheryl Greene
Lisa,
According to the latest understanding of science, an AB parent can not have a child who is O.
It may be wise to have everyone’s blood retested.
Best,
@MsGreene
Added:
Mayur
Father blood b+ mother blood o+ child blood B-
Added:
Cheryl Greene
Yes, this is possible.
Added:
Inge
Can a O+ mother and a O+ father have a A+ baby? What is the chances that this could ever happen?
Added:
Cheryl Greene
According to our current science, it is not possible for two O+ parents to have an A+ child.
Before you jump to any conclusions, we always stress that blood tests can be in error, or may have been recorded in error. It is always wise to retest and if you’re still unsure, a DNA paternity test is much more accurate.
Best,
@MsGreene
Added:
rafiq
Is there ANY possibility that a B+ father and an O mother having a A+ child?
Added:
Cheryl Greene
According to our latest science, it is not possible for one parent to be B+, the other to be O and their child to be A+.
Before jumping to any conclusions, it is wise to have both parents and the child retested. It’s not uncommon for one of the tests to be in error or for there to be an error in recording the tests.
If the tests results remain the same, DNA paternity testing would be wise as it’s much more precise.
In time, we may learn of new science or the possibility of mutations.
Added:
Prachi
Mother blood group is A+ and father is having B+then how is possible ki my baby having o+
Added:
Cheryl Greene
Dear Prachi,
Blood types have two alleles with letter names – A, B, and O. A and B are dominant and O is recessive. One allele is passed down from each parent.
If one parent is type A he or she can have blood that is AA or AO (this is called A because the O is recessive). If this parent is AO, he or she can pass either the A or the O down to his or her child.
If the other parent is type B, he or she can have blood that is BB or BO (this is called B because the O is recessive). If this parent is BO, he or she can pass either the B or the O down to his or her child.
This means if one parent is type A the the other is B, they can have children who are:
— AB
— AO (called A)
— BO (called B)
— OO (called O)
Does that make sense to you?
Best,
@MsGreene
Co-founder and Executive Producer, DrGreene.com
Added:
Gajanan
My blood group is A+ and my wife’s blood group is B+ but my daughter’s blood group is B-.
How can happen this if we both are Rh+?
Added:
Jordan
Hello doctor green, my blood type is B- and my mother’s is B+ so what blood type would my father have to have?
Added:
Cheryl Greene
If one parent is B+ and the child is B- the other parent could be:
O+
O-
B+
B-
Hope that helps,
@MsGreene
Added:
RR
Hi doctor green.. my blood group is o-ve , my wife blood group is also o-ve ..and we got a male child recently who’s blood group is o+ve .. is this possible??
Added:
Cheryl Greene
RR,
According to our current science, two O- parents can not have an O+ child. It would be wise to have all three of you tested again to make sure these types are correct. It’s not unusual for tests to be in error or for the test results to be recorded in error.
If these blood types are correct, it’s important to know — a mother with O- blood, who has a child with O+ blood needs to be treated before conceiving any other children. Here is Dr. Greene’s Q&A that discusses this issue –> How To Determine and Manage Rh Incompatibility.
@MsGreene
Co-founder & Executive Producer, DrGreene.com
Added:
Karenu
My blood type is an postive im pretty sure my dad’s blood type is positive but don’t know what my mom’s was wondering what it could be with me being an podtive
Added:
Cheryl Greene
It could be either Rh positive or Rh negative.
Added:
Rishabh Rai
I have an blood group of A-,and my father blood group is B+ what’s the most possibility of mother’s group. Is I am rare.
Added:
Ashley Bircher
I am O+ and my husband is O-, obviously our child is an O but what Rh factor would be most likely with the provided information?
Added:
Cheryl Greene
Both Rh- and Rh+ are possible.
Added:
devi
the baby can be rh positive or negetive.
Added:
Loolucy
Im a Arhs negative mother with 1 dAughter who’s I BRhs negative and a daughter who is Orhs positive have they got same father
Added:
Cheryl Greene
The information you provide does not rule out the two girls having the same mother and father. Neither does it prove they have the same mother and father.
Let me know if you’d like an explanation that supports that conclusion.
Best,
@MsGreene
Added:
bill
Can a female who is RH – and a male who is O+ have a child that is B+?
Added:
Cheryl Greene
If the mother is B- and the father is O+, they can have a child who is B+. This is because blood group B is dominant and blood group O is recessive. In the Rh system, + is dominant and – is recessive.
The issue that is of more concern is if the mother is Rh- and the baby is Rh+, she needs to be treated before conceiving another child. See Dr. Greene’s Q&A How To Determine and Manage Rh Incompatibility.
Best,
@MsGreene
Added:
bill
that was not my question . she is RH- and the male is O+ . hoping you can answer in a simple response ,.. yes or no.. thanks
Added:
Cheryl Greene
Yes, if one parent is Rh- and the other is O+, they can have a child who is B+.
Added:
Varu Bhavesh s
My blood group B+ and my wife A negative blood group but my child blood group is B negative how is possible ? Reply me sir it’s possible and you understand to me in graf .
Added:
Varu Bhavesh s
Dear sir give me reply .please
Added:
Cheryl Greene
Yes, it can happen and is common.
Added:
Varu Bhavesh s
Thanks sir
Added:
Unsure
My Dad in his discharge papers from US Army says he’s O+ but,one of my sisters said he had A+ blood. My mother had O-, I am the one of 3 daughter’s of theirs and I have A+. My husband is AB+, our children are the following types; 1st daughter is A-, 2nd daughter is B-, my son is B+. Could you please shed some light on this as both my parents have passed on & my siblings refuse to be tested to see if we have the same parents or not. I would really like to know if I am truly related to them or not. I could really use your help please.
Added:
alvira
was wondering if mother is o and father is ab can they have a child born with o type blood
Added:
Arthur
Doc I am AB+ and my sister is AB- is it possible that we came from the same parents, a local doctor says it is impossible.
Added:
vasu
Blood groups &relation a,b,ad,o,da positive and negative blood group
Added:
Emily
Both my parents are O’s but I am an A+, my husband is also an A but both his parents are O’s. However our two children are both A+, some times it seems your chart is wrong. We both look just like our dads so there is no way that our fathers aren’t out actual fathers.
Added:
Cheryl Greene
Modern science is always learning. You and your husband and your four parents would be a great test case to see how this could happen. Have you contacted a major university genetics department and offered to be study participants?
Added:
suhel
father blood group B positive and mother A positive child should which blood group
Added:
Cheryl Greene
Suhel,
If one parent is A+ and the other is B+, their children can be A, B, AB, O and can be positive or negative.
Best,
@MsGreene
Added:
suhel
thankx my baby b positive its ok
Added:
Sujit
If I’m B+ and my wife is B+ can our child be AB+?
Added:
Cheryl Greene
If two parents are type B+, they can have children who are Rh= or Rh-, but it is not considered possible to have a child that is type AB.
If you are concerned, it’s wise to have all types rechecked. It is possible for the type of one of the three to be recorded improperly.
Best,
@MsGreene
Co-founder & Executive Producer, DrGreene.com
Added:
Roxy
I am Negative RH (A) and my son is Positive A, what should the father’s blood type be?
Added:
Roxy
Hello, I am Negative Rh and my son is A Positive, what should his father blood type be?
Added:
Marie
Hello,
Can an A+ mother and O- father have a baby that is O+?
Thank you
Added:
Marie
Thank you
Added:
Michelle
Your last sentence is beautiful! Thank you :)
Added:
Debbie
Can o+ and a+ make a baby a-
Added:
Anonymous
I have the A Negative (A-) blood type. My mother has the A Positive (A+) blood type, and my father has the A Positive (A+) blood type. So, how can I have the A- blood type if both of my parents are + blood type?
Added:
Anyone
Both parents are A+ and the child is O- is it possible?
Added:
Bismark Addo
I and my wife are A+ but the child is O can it be possible
Added:
Cheryl Greene
Yes, this is possible. In fact, it is common.
Added:
Tellie
If the father is O+
And the mother is O+
They have 3 children:
Child (1) has O+
Child (2) has O-
Child (3) has O-
Is that possible to have two RH negative children
Added:
Cheryl Greene
Hi Tellie,
If both parents are O+, each of their children have 6.25% chance of being O- and a 93.75% chance of being O+. This means if they had 100 children (which would be beyond a world record) 6.25% of them (which is tough, since there aren’t any .25 children) would be O-.
Is it possible for two out of three to be O-? Sure is, but if these two parents kept having babies, statistically, they would start having several O+ kids in a row.
Another way to think of this, if you toss a coin, statistically 50% of the time you’d get heads and 50% of the time you’d get tails, but it’s not unusual to get several heads or several tails in a row.
Does that make sense?
Best,
@MsGreene
Added:
Betty Madrid
I first questioned having a blood type of A+ over 20 years ago when one of my sisters needed a bone marrow transplant and apheresis.
all of the family was tested for donation including our father.
my mother had already died, and prior to her death she had several blood transfusions, she had blood type O+.
my father has since passed and according to the blood bank and the Naval records his blood type was B-.
out of 6 children 2 were B+, 3 are O+ and I am A+.
of all of the researching I have been doing for the last 5 years everything claims that it would be impossible for this to be true, and that one of my parents is not actually the parent.
I have done DNA testing with one sister which showed that it is 99% that we have the same mother and 51% that we could have the same father. Basically we have concluded that our fathers were related to each other.
my father had one full brother that was available at the time. he died what i was 10, and I have been trying to find out his blood type for all these 5 years.
can you think of any way that i could be the child of the O+ and B- parents?
thank you for this wonderful website and the opinions you have shared.
Added:
Shaun Maxim
My blood type is A- and my daughter A- her mother is B+ is this possible. Do I need to be concerned if I am the father?
Added:
Cheryl Greene
From what you’ve said, you and your daughter have the same blood type. Why would that make you question if you’re her father? Are you concerned that the woman you think is her mother is not her mother?
Added:
JD
Hi Dr. I have a question regarding “weak D”. Both mother and father have a blood type test result of “B Positive”. Child received a result of “B Positive with Weak D”. Would the weak D have to be inherited from one of the parents?
Added:
Sandra L
my father was A-
my mother was O-
I am O+
?
Are these blood type possible?
Really not important just curious, my Dad gave me a funny look when I told him my blood type just before he pasted in 2006.
Added:
Cheryl Greene
Rh- is recessive. Therefore two Rh- parents will have Rh- children.
You are in a tough position since you can’t confirm your father’s blood type, but it is not at all unusual for one of the three blood types to be different than what was reported or different from what is remembered. There’s so much that can go wrong during testing and reporting.
I hope that helps,
@MsGreene
Added:
Ivyg
Hello, Dr Green! I read the article and I’m pretty much confused. These are the facts – father is 0+, mother is B+, child is AB+. There is no any doubt that they are the parents. Is this a case of an exception?
Added:
Bright
Please my blood group is O+ and my wife has O+, please is it possible to have O+ child?
Added:
Cheryl Greene
Two O+ parents can have an O+ child or and O- child. O+ is far more likely.
Added:
MARISOL
MY MOM IS AB+ AND MY FATHER IS O+, I’M O+ SO I’M IMPOSSIBLE CHILD?
Added:
Dorothy
i am blood type O (rh+) and my husband type O (not certain of his Rh . our daughter is Blood group B+. all blood type charts say its impossible! can you explain this? is our daughter an impossible child?
Added:
CoCo
My mother’s O+ but, I’m AB- there is no way what so ever that I’m adopted. There are pictures of me in the hospital when I was born and when my mother was pregnant with me.
We’re unsure what blood type my father is, though he’s most likely O.
So how is that possible?
Added:
Anand
Hi sir i am anand from india , sir my blood group A+
And my wife A-
1 year before she born a baby boy but 3 day after he death .. Delivery time doctor not give RHOGAM shot .. Now she is agin pregnant
Dear sir now what i do , it,s her second delivery how i give her anty D injection and qhich week ..
Added:
Parentally Confused
Good Evening, I have a confusing “typing” issue. My “dad” {according to the US Army is “O+” but according to one of my older sisters he had “A+” typing}. My mother had “O-“, I am daughter # 3 of theirs and I have “A+” typing. My husband is “AB+”, our children are the following types; 1st daughter is “A-“, 2nd daughter is “B-“, my son is “B+”. I requested that my children be re-tested along with my husband and they all came back with their same types unchanged. I do not look like anyone on my “dad’s” side at all. My 1st sister & my only brother look just like my “dad” & his side of the family. My 2nd sister & I do not look like our “dad” at all. I am only 5’6″, green eyes, very light blond hair, & stocky build, my “dad” was 6’3″ & very thin build with blue/ black hair, dark brown eyes and my mom was 5’5″, very dark brown eyes, dark auburn hair, & stocky build. All of my siblings have dark brown hair, sister #2 & brother have dark brown eyes, 1st sister has one dark brown eye & one dark blue eye and all of them have thin builds. I asked my biology professor, who has her Masters in Blood Serology, if My “dad” could be my “dad” & she said that there’s no way he could be. So could you tell me your opinion on this confusion. Could you please shed some light on this as both my “dad” & mom have passed on & my siblings refuse to be tested to see if we have the same parents or not. I would really like to know if I am truly related to them or not.
Added:
Anonymous
This basically is not a comment but a question.
Its that I wanted to know if your blood group doesn’t matches to any of your family member that is mother, father, sister or brother then does it means that the child is not their own child??????????
Please reply on my personal email address.[email address redacted]
Thank you
Added:
Cheryl Greene
Dear Anonymous,
I’m sorry, but we do not respond via email, only in a public forum. I did want to answer your question, though because I think it’s one other people may have.
It is possible to have a different blood type than any of your first degree relatives. Here is one example:
— Parent One has type A+ blood
— Parent Two has type B+ blood
— Child One has type A+ blood
— Child Two has Type B+
— Child Three has type AB- blood
I hope this helps.
@MsGreene
Co-founder and Executive Producer, DrGreene.com
Added:
LorriA
My mother is an A, my father B. I am an O. My siblings are A, B and AB.
Added:
Cheryl Greene
Hello LorriA,
Blood types have two alleles. Each child gets one allele from each parent. A and B are dominant and O is recessive. In the example you provide here is how it could look:
— Parent One has type A blood, which can be AA or AO, but in this scenario, we can assume it’s AO
— Parent Two has type B blood, which can be BB or BO, but in this scenario, we can assume it’s BO
— Child One gets an O from each parent and has type O blood
— Child Two gets an A from one parent and an O from the other (AO) and has Type A blood
— Child Three gets a B from one parent and an O from the other (BO) and has Tyup B blood
— Child Four gets an A from one parent and B from one parent and has type AB blood
Does this make sense?
@MsGreene
Co-founder and Executive Producer, DrGreene.com
Added:
AM
Can a child be A-blood type if both the father and mother have O+ blood types?
Added:
Cheryl Greene
Dear AM,
That’s not considered a possible outcome for two O+ parents.
If the mother is sure there could only be one father, it’s time to get everyone re-tested. Mistakes do happen in the testing process. If there’s more than one possible father, a DNA paternity test will be much more specific about who the father is.
Hope that’s helpful.
@MsGreene
Added:
A. Matthews
That is exactly what I thought also. Thanks for clearing this up for me and the child.
Added:
Linda Woodhall
My father was born in 1904. My brother and I are attempting to determine his blood type. Is there anyway you know of that we could trace this down?
Added:
GOPAL
DEAR SIR I AM 0+ AND MY WIFE ALSO O+ BUT CHILD ARE B + IS POSSIBLE PLEAS HELP ME
Added:
Cheryl Greene
Gopal,
Our current science doesn’t support this combination. However, there are several possibilities — One of the three blood tests could be in error, they could have been reported in error, one of the results could have been remembered incorrectly, etc. Before jumping to any conclusions, it’s wise to have all three blood types re-tested.
I hope that helps.
@MsGreene
Co-founder & Executive Producer, DrGreene.com
Added:
zen
I am also o and my wife is the same to me but my kid is b, is possible?
Added:
zen
Is there any possibility of getting wrong classifying while identifying the type of blood?
Added:
Cheryl Greene
Zen,
It is not uncommon for blood type testing to be in error or be reported in error or be remembered incorrectly. Whenever you have an “impossible” combination, such as two parents who are Type O with a child that is not Type O, it’s best to have everyone retested. If the tests still come back as an “impossible” combination, DNA paternity tests can be done to determine if the father is a match to the child.
I hope this is helpful,
@MsGreene
Added:
Kathleen Walters
My father was type AB+ blood type the only one out of 4 siblings.
How does that happen?
Added:
Cheryl Greene
Hi Kathleen,
Here are the options:
— One parent is A and the other is B
— One parent is A and the other is AB
— One parent is B and the other is AB
— One parent is AB and the other is AB
I hope that’s helpful,
@MsGreene
Co-founder & Executive Producer, DrGreene.com
Added:
Nicole
I’m trying to guess what my children’s blood type might be: Just curiosity for now.
My first daughter: I am A+ and her biological dad is also A+, what possibilities does she have for her blood type?
My second daughter: Again, I am A+ and her dad is O+, what possibilities does she have for her blood type?
Added:
Jane
I’m rheses negative B my daughter is A+ what blood group does that make her dad
Added:
bunny
I am B+ and my wife is O+. I had a son of A+. Whether is it possible?
Added:
ikapel
Hi Dr. am Ikapel. am a lady and i have had three husbands. am rhesus negative, my first hubby was rhesus positive and i had with him one son, then the second was rhesus negative and we had a son. now am expectant for the third husband who is rhesus positive, could the antibodies that were developed during my time with the first husband be there so as to recognize thiz zygote as foreign or they were they cleared with time because its now 4 yrs. no hospital near.
Added:
Cheryl Greene
Ikapel,
I’m not a doctor, but it’s my understanding that the risk is a life time risk. You should be tested and likely treated before becoming pregnant again.
Hope that helps,
@MsGreene
Co-founder and Executive Producer, DrGreene.com
Added:
Lisa
I told my daughter that she will be B+ because you had to have either your mother or fathers blood type and I and my husband are both B+. I was WRONG when she got pregnant they took her blood and told her she was B-. Her husband was also B+ like us (the grandparents). She got one shot mid. pregnancy but when the baby was born they said she didn’t need another shot because the baby was also B-. Can the Rh- be on any blood type no matter if both parents are positive?
Added:
Cheryl Greene
“Can the Rh- be on any blood type no matter if both parents are positive?”
Because of dominant and recessive genes, there is a 6.25% chance that the child of two Rh+ parents will be Rh-. T
Hope that helps,
@MsGreene
Added:
shreeprasad
if father and mother are of B+and O+ respectively what will be blood group of child?
Added:
Cheryl Greene
If one parent is B+ and the other is O+, there is a 75% chance that each of their children will have type O blood and a 25% chance of having type B blood. There is a 93.75% chance that each of their children will be Rh+ and a 6.25% chance that each of their children will be Rh-. That means each child could be:
— O+
— O-
— B+
— B-
Hope that’s helpful,
@MsGreene
Added:
Yeeshu
Dear sir
I have A + blood group and my wife having o+ but born baby blood group is B+ is this possible or not
Added:
Cheryl Greene
According to our best current science, it is not considered possible for a baby to have blood type B if one parent has blood type A and the other has blood type O.
It is not uncommon for blood types to be in error either from a lab mix-up, a reporting error or one party not remembering his or her blood type correctly. It would be wise to have all three party’s blood retested.
I hope that is helpful,
@MsGreene
Co-founder & executive producer, DrGreene.com
Added:
Crystal
That would be no. I think your wife has some explaining to do. I’m sorry!
Added:
OPHINTA
CAN A O BLOOD TYPE GET PRENANCY FROM SOMEONE WHO HAVE B
Added:
Anonymous
Hi there. So my boyfriend is AB positive and I’m O positive but our twins are O positive and O negative. Does this mean there is a chance my boyfriend isn’t the father?
Added:
Sandy
Im O- and my husband is A+ we have a son who is B+ and my sister told me that’s not possible is she wrong
Added:
Cheryl Greene
One of your blood types may not be what you think it is, but the scenario you’ve outlined is not considered possible. Here’s why …
Each person has two alleles that make up their blood type. Here is how that looks:
— Type A = A & O or A & A
— Type B = B & O or B & B
— Type O = O & O
— Type AB = A & B
Each parent gives one allele to their child. In this example:
— Type O can only give an O
— Type A can give an A or an O
The child can be:
— Type O = O from one parent and O from the other parent
— Type A = A from one parent and O from the other parent
But there is another issue in the scenario you outlined. From what you’ve said, you have Rh- blood and your child has Rh+ blood. In this scenario, you should have received treatment to prevent problems in future pregnancies. Did you have treatment? If not, you need to talk to your doctor before possibly becoming pregnant again. Dr. Greene has a full explanation here –> How To Determine and Manage Rh Incompatibility.
I hope that’s helpful,
@MsGreene
Co-founder & Executive Producer, DrGreene.com
Added:
Kadas
My baby is B negative and im B positive his dad AB positive can this be right is this his father
Added:
Cheryl Greene
Hi Kadas,
If one parent is B+ and the other is AB+, each of their children have a 50% chance of having type B blood and a 25% chance of being Rh-. If your scenario, this neither proves nor disproves that the man you think is your baby’s father is his actual biological father.
I hope that’s helpful.
@MsGreene
Co-founder & Executive Producer, DrGreene.com
Added:
esther
AM Esther
hello doctor. if its my first pregnancy and i have o negative and my husband has o positive. do i begin injections at the first born? or second??
Added:
Cheryl Greene
Hi Esther,
It’s great that you’re asking this question now.
Dr. Greene has a comprehensive answer here –> How To Determine and Manage Rh Incompatibility.
I hope that’s helpful,
@MsGreene
Co-founder & Executive Producer, DrGreene.com
Added:
esther
my husband is O positive and me i also have O negative. is it possible for us to have a baby’s born alive? advice us Dr.
Added:
Cheryl Greene
Hi Esther,
Dr. Greene has written a lengthly answer to a question very similar to yours. You can find it here –> How To Determine and Manage Rh Incompatibility.
It’s important that you discuss this with your doctor, including any past pregnancies you’ve had, even if you’ve miscarried.
I hope this is helpful,
@MsGreene
Co-founder & Executive Producer, DrGreene.com
Added:
Esther
Hi Dr.
My husband is B positive and I am O positive. I hope there won’t be problem in having a issue.
Added:
Cheryl Greene
Hi Esther,
B+ and O+ are compatible blood types. The only issues occur when the mother is Rh- and the father is Rh+. Dr. Greene discusses that here, but it is not an issue if the mother is Rh+.
Hope that helps,
@MsGreene
Added:
SK
I’m O positive. My mom is A positive, but as from what my mom says my one possible father is B positive and my other possible father is O positive. Who is the father…
Added:
Cheryl Greene
Hi SK,
Each person has two alleles that comprise the blood type. It looks like this:
AO = Blood type A
BO = Blood type B
OO = Blood type O
AB = Blood type AB
A parent can pass down either of the alleles to the child. If one parent is A+ that parent has an A and an O allele. If the child is O+ the child has two O alleles. The child’s father could be A+ (AO), B+ (BO) or O+ (OO).
For you to know who your father is, you would need a DNA paternity test.
Hope that helps,
@MsGreene
Added:
Julia
How about my dad is o- and my mom is a+, I’m ab+… I was told he isn’t my real dad, you think this is possible
Added:
Julia
How about my dad is o- and my mom is a+, I’m ab+… I was told he isn’t my real dad, you think this is possible, also my sister is o+
Added:
Alexandria
I’m o positive and my mother is o negative what blood type could my father be.
Also my son is A- what type would his dad be
Added:
Cheryl Greene
If one parent is O+ and the child is O-, the other parent could be A+, B+ or O+.
If one parent is O+ and the child is A-, the other parent could be A+ or AB+.
Hope that helps,
@MsGreene
Co-founder & Executive Producer, DrGreene.com
Added:
Will
My wife is A- and I am B+. We have being trying to conceive but have not been successful thus far, please tell me if we are compatible to conceive.
Added:
Cheryl Greene
Hi Will,
Conception isn’t determined by blood type compatibility. If you are concerned that it is taking too long to conceive, you may want to see a fertility specialist.
The problem with blood type incompatibility comes to the baby, but rarely the first baby. Dr. Greene discusses this in an answer to another reader — How To Determine and Manage Rh Incompatibility. He says:
This is important for you to discuss with your doctors, but there is a treatment.
I hope this is helpful,
@MsGreene
Added:
Sara
If I am O negative and the baby’s father is also O negative is it considered a genetic mutation if the baby is O positive?
Added:
Cheryl Greene
Hi Sara,
Before calling it a genetic mutation, all blood types would have to be confirmed through repeat testing and paternity testing would have to be done.
Hope that helps.
@MsGreene
Added:
Teodora
Hello! When you say “impossible children”, what are the odds? If my presumed Dad is o+, my mom is B+, but I am AB+, is there no chance my Dad is who he claims to be?
Added:
Tim
I have type O+ my ex wife has B+ is it possible that we could have a child with type ab- my mother and half sister both had ab+
Added:
Brett Muney
Both kids are o+ and wife is o+. What am I(dad)?
Added:
Cheryl Greene
If one parent is O+ and children are O+, the other parent could be A+, B+ or O+. The other parent could NOT be A-, B-, O-, AB- or AB+.
Hope that helps,
@MsGreene
Added:
Lyndale Acena
Hi, i want to ask if its possible if my baby got type B ? Me and my bf is Type O
Added:
rajeshkashid
when the parents having same blood group then there is possibility to born the baby
Added:
Kadas
Im B positive and my baby is B negative. The one Guy is Ab Positive and the other guy is B negative. I would like to know who is the father of my baby.
Added:
Cheryl Greene
In the situation you describe, blood type alone will not provide the answer. Either man could be the father. A DNA paternity test is the next step if you want an answer.
Added:
Liza
I’m aa and my husband’s o what would our child have for blood type?
Added:
Cheryl Greene
Each parent passes down one allele. If you are AA, you would pass on an A allele. Type O blood is always OO. If your husband is type O, he would pass down an O.
A is considered dominate and O is recessive, so if a child got one A and one O, the child would be AO, which is type A blood.
Hope this helps,
@MsGreene
Added:
KOUSTAV
i am 0(-) blood group,my wife has 0(+), can baby possible at this situation???? plz,sir!!! we are tensed.
Added:
Cheryl Greene
The Rh incompatibility problem is only an issue if the mother is Rh- and the father is Rh+. There is not an issue if the mother is Rh+. For a full explanation, read Dr. Greene’s answer to another reader — How to Determine and Manage Rh Incompatibility.
I hope that’s helpful.
@MsGreene
Added:
DEVANK
Can a child have blood group B negative when his father have O positive and mother have B positive. Plz reply.
Added:
Cheryl Greene
Yes, this is possible. There is a 75% chance of being type B and a 6.25% chance of being Rg negative.
Added:
sohel rana
I m AB+ and my wife is B+ is there any effect of my baby or any problems for my baby life
Added:
swetha
Mine would be o+ and my husband is B- wht would be child birth then can i know…..
Added:
Cheryl Greene
If mine parent is O+ and one parent is B- there is a 75% chance each child will be blood group O and 25% chance each child will be blood group B. There is a 75% chance each child will be Rh+ and 25% chance of being Rh-. This means any child could be:
O+
B+
O-
B-
Hope that helps,
@MsGreene
Added:
jhon
my blood 0+and my wife a- what posibale baby and chance plz tel me
Added:
Cheryl Greene
If one parent is O+ and one is A- there is a 75% chance each of their children will be blood group A and a 25% chance each of their children will be blood group O. In addition there is a 75% chance each of their children will be Rh+ and a 25% chance each of their children will be Rh-.
Hope that is helpful,
@MsGreene
Executive producer, DrGreene.com
Added:
jhon
hi i am male my blood 0+ and female a- what baby save or no tell me pleace
Added:
Suprava Mahara
You say your wife is A-,we don’t know the blood group of your baby.He/She could be positive or negative since you are O+.Now there will not be any problem if your baby also has negative blood group like the mother.But if the baby is positive and the mother is negative,then there will be loss of 2nd baby(not the first one).We have an injection to stop that,its called RhoGAM .So don’t panic right now.You need the baby’s blood to be positive for bad things to happen.IF the baby is negative,everything is okay.IF not there is always an injection :)
Added:
surendra k shukla
hi doctor, Pls tell me is it possible that if mother is O positive and father is O Positive but child is B Positive.
Added:
Lyndale Acena
I ask the same question, my baby is type B. But me and my bf is type O
Added:
Jackie
If mom is O+ and dad is AB+ and both sons are B+ and B-. What is the likely hood percentage wise that the one with B+ is not the dads.
Added:
Jackie
Very interested in your answer. It is causing quite the debate on our end. Thank you. The child in questions mannerisms are just like the father, even though he was never around him, but he has none of the physical attributes that seem to be prominent in the rest of the family.
Added:
Cheryl Greene
If one parent is O+ and the other is AB+ there is a 50% chance each of their children with be blood group B (the other 50% will be blood group A). 93.75% of their children will be Rh+ and 6.25% will be Rh-.
Hope that helps,
@MsGreene
Added:
kumara
mother and father O+ and son also O+. is there any effect of my baby son?
Added:
Sherry
Hi doctor if theres only two possible fathers can a blood type test definitely eliminate one of them and if so how is that possible
Added:
Cheryl Greene
That depends on the blood type of the mother, the baby and the two men. It is possible with some combinations, but I wouldn’t count on it. A paternity test is a much better test.
Hope that helps,
@MsGreene
Added:
Bilinda
Hi .. My recently born niece is B positive and her mom and dad are of same blood group A positive. Is it possible?
Added:
jay ar
hi doc! is it possible for blood type O for women and blood type A for men to have a baby?
Added:
jay ar
hi doc ..my girlfriend blood Type is O and mine is A..is this possible blood type match for a baby?
Added:
Nina
Both of my parents have blood type O, and I as their daughter is blood type AB. Is it possible?
Added:
D.latha
Hello doctor…..
My parents both are o+ blood group,i am o +,but my two brothers are hav A+ blood group is it possible
Added:
D.latha
Oh my god mind blowing… I can’t believing….ohh my god
Added:
D.latha
Hi doctor,
Is it possible to children having parents either mother or fAther blood group…
Added:
stephen sekyi
please doctor i am AS- and my girlfriend is O+what possible child are going to have please i need answer.
Added:
Charlie
If one parent is native american and has the rare type RzRz and the other parent is A+, what is the child’s blood type likely to be?
Added:
Isaac
Can we have a child with blood group O- if I am A+ and my wife is A- ?
Added:
Cheryl Greene
Hi Isaac,
There is a 6.25% chance that each child of parents who are A+ and A- will be blood group O and a 25% chance each child will be Rh-. Possible blood types for these two parents are:
A+
A-
O+
O-
Hope that helps,
@MsGreene
Added:
Joyce
I have o+ and my husband is b+ is it possible for our child to be o-?
Added:
Cheryl Greene
Hi Joyce,
Yes it is possible for a child to be O- if one parent is O+ and the other is B+. The odds for each child are 25% chance of being type O and 6.25% of being Rh-. Possible combinations are:
B+
B-
O+
O-
Hope that helps,
@MsGreene
Added:
Laurissa
Both of my parents are A negative. My brother who is 6 yrs older has the same parents as me, and has A negative, I’m A positive. Is that possible?
Added:
DebJani Mallick
Hey dr. I wnt to know: if father is B+ and mother’s blood group is O-. Can they have kids?
Added:
Cheryl Greene
Dr. Greene provides a detailed answer that addresses your concerns in another article. Here it is:
How To Determine and Manage Rh Incompatibility
I hope this answers your question.
@MsGreene
Added:
sue
Both my parents and 6 siblings have A pos im O rh D neg is this possible
Added:
Eva
My blood group is B positive and my husband blood group is B negative. We are healthy and still haven’t physical problem. but what is the possibility of any problem in blood group about our child? is there any ?
Added:
Cheryl Greene
Here’s more information from Dr. Greene to answer your question — How to Determine and Manage Rh Incompatibility.
Hope that’s helpful,
@MsGreene
Added:
Matet
My parents are type ab and o types of blood and i am type o ..but in the chart i am impossible child..but my mom is already dead and some of my relative told me that her type of blood is ab!!
Added:
Gina Loree Griffin
I think this particular article is crap. I have two children, I’m 0+, my husband is ab-…both of my children are 0+. In other articles I’ve read, this is not only possible but absolutely correct. Check the American Red Cross.
Added:
Terese
Hi gina, hows your two baby?im 4months pregnant my ob told me that im type O+ and my husband is type AB there will be possibilities that my unborn child will likely to have jaundice
Added:
azzam hawil
I am A+ type and my wife is AB+, my little girl is O-, can this be possible, knowing that my father is O+ and my wife’s mother is O-.
Thanks
Added:
azzam hawil
I am A+ type and my wife is AB+, my little girl is O-, can this be possible, knowing that my father is A+ and my wife’s mother is O-.
Thanks
Added:
Rachael
Dr. Green, may I still ask a question about blood but not about the blood types?
Added:
Cheryl Greene
Everyone is welcome to post to comments. Not all comments or questions get replies. We do our best and we strongly urge readers to answer each others’ questions.
Added:
Gift
My parents are both 0+ blood group type, and all my siblings are 0+ blood group type, and am 0- blood group type, I have re-test over and over,still showing same result, pls is this possible? Are they really my parents? Or there’s a mistake some where? Pls if possible email me the answer in private. Kind regards.
Added:
Cheryl Greene
You can relax. This is totally possible. Each child of two O+ parents has a 6.25% chance of being O-. Here is the explanation from Are They Really My Parents? by Dr. Greene:
“The Rh system is actually far more complex than the ABO system in that there are 35 different possibilities that one could inherit from each parent. These, however, are roughly grouped into positive and negative types. In this system the positive are dominant over the negative. If your genetic type is ++ or +-, your blood type will be Rh positive. Only if your genetic type is — will you be Rh negative. This means that if both parents have Rh+ blood with the +- genes, they could have children who are ++, +-, or –. In other words, their children could be either Rh positive or Rh negative. Children who are Rh negative can have parents who are either Rh positive or Rh negative.
Two parents who have O positive blood could easily have a child who is O negative. In fact, most children who are O negative have parents who are positive, since the +- combination is so much more common than the — combination.”
Hope that helps,
@MsGreene
Added:
Shailesh
I am B- and my wife is B+ and our baby blood group shows AB+. As per above table it is not possible. In rare case is it possible?
Added:
Cheryl Greene
In this case, I would recommend both parents and baby have their blood re-tested. If there is still a question, you can get more information from DNA paternity tests.
I hope that helps,
@MsGreene
Co-founder and Executive Producer, DrGreene.com
Added:
Barbara
Hello, I am B positive, and my husband is o negative. what blood types as far as negatives and positives can our children have?
Added:
mary n
can i stay pregnant without taking pills for pregnancy if i am B+ and my partner is 0+ ?
Added:
RachaelI
If I am O- and my husband is B+, is there any chances our child will be A+? Why or why not (please explain)? Thank you
Added:
Nadia Salim
Hey Dr. Greene
My husband is A+ and me A- are there chances of me conceiving
Added:
Nadia Salim
We r blood related me and my husband he is A+ and Mine is A- are there chances of me conceiving
Added:
anjilie
what if my blood is AB positive and my mom A and my dad is O positive is that my dad ?
Added:
Cheryl Greene
For a child to have AB blood her (or his) parents would need to be:
A, B
A, AB
B, AB
But before you jump to any conclusions, all three of you should be retested. It’s not unusual for one of the three test to be incorrect — error in testing, mix-up in the lab, not recorded properly, not remembered as reported, etc.
Hope that helps,
@MsGreene
Added:
mehnaz
I am O positive and my hubby is A postive…our child is O negative. Is it possibble?
Added:
Cheryl Greene
Yes, this is possible. If one parent is O+ and the other is A+ there is a 25% chance each child will have type O blood and a 6.25% chance each child will have Rh- blood.
Hope that helps,
@MsGreene
Added:
Bobby
If my baby blood type is b,what would me and the mother have to be to make this true
Added:
Cheryl Greene
There are several combinations that would result in a child having type B blood:
B, A
B, B
B, O
B, AB
A, AB
O, B
O, AB
AB, AB
Hope that helps!
@MsGreene
Added:
Bess
My husband tested 0+ (twice) and I don’t know mine. My son is AB-. No doubt as to parentages. Husband did go into shock after a long surgery when given platelets. What blood type could I be and is all this even possible?
Added:
Tim
why did he have it tested twice?your blood type remains the same all of your life
Added:
naman
What is the probability of getting a male child if mother and father both have A positive blood group..
Added:
ugo
If my wife have sex with another man and eventually my blood group and they man is they same . how can we Identify they father. Now that my wife is pregnant . help me pls. Because I am getting confused.
Added:
Cheryl Greene
DNA testing can provide valuable information regarding paternity.
Added:
Rebecca
Dr Greene my daughter is having her first child she told me her dr had determined she has A neg blood type.
Both my husband and I have o pos
Her dr must have mixed her test results with another patient, correct.
Thank you, Rebecca
Added:
Cheryl Greene
Two parents with type O blood can only have a child with type O blood. Keep in mind, it is possible that any of the three of you had an error in your blood test, it was reported in error, or someone remembers it incorrectly. The next step is to have everyone re-tested.
Hope that helps,
@MsGreene
Added:
Shellby
If my mother is A- and I am A-. Is there a specific blood type that my father must be?
Added:
Cheryl Greene
In this scenario, the other parent could be A-, B-, AB-, or O-. That doesn’t narrow things down much :)
Best,
@MsGreene
Added:
Dawn Forsythe
Can two people produce a child 0- and one A-? If one child is A- and the other is 0- then what blood type would the parents have to be?
Thank you!
Added:
Cheryl Greene
Hi Dawn,
If one parent is O- and one is A-, each of their children could be A- or O-.
Hope that helps,
@MsGreene
Added:
Khushi, India
Hi Dr, I want to know: if father is A+ and mother is A- , the girl child is A- then the boy can be O-?
My friend is O- , sister is A- and mother is also A- and the father is A+.
Please answer Doctor can it be possible that he will have O-?
Added:
Cheryl Greene
If one parent is A+ and the other parent is A-, each of their children have a 6.25% chance of being blood type O and 93.75% chance of being blood type A. Each child has a 25% chance of being Rh- and a 75% chance of being RH+. In other words, the scenario above it completely possible.
Hope that helps,
@MsGreene
Added:
Laura
My husband got ahold of his possible half sister and looks just like his twin. Anyways the girls mother denys that my husbands father is her dad. Anyways the girl said she had suspicions cause the rumors she heard and cause her supposed dad that she has is O+ and she’s a AB-, she doesn’t know her mom’s blood type. Can a O+ make Ab-, I just don’t see it. Anyway my husbands dad is A+ I belive.
Added:
Mahi
hello doctor… my husband is O+ and mine is O-. Can we have children??
Added:
Cheryl Greene
Dr. Greene wrote an excellent answer to a reader about this same issue — How To Determine and Manage Rh Incompatibility.
Hope that helps!
@MsGreene
Added:
amar thakor
Father B+
Mother O+
And child born O-
Its possible
Added:
Cheryl Greene
Hi Amar,
If one parent is B+ and the other is O+, there is a 25% chance each child will be type O and a 6.25% chance each child will have Rh- blood.
Hope that helps,
@MsGreene
Added:
Tami
My husband was told years ago that his blood type is A negative. We have two children together. Our daughter had her’s tested today in class (classes for nursing) and she is A positive. Our son has previously donated blood and he is A negative. My husband has another son (not biologically mine) and he is A negative. Based on my husband’s, and our two kids (A- & A+) … what would you expect my blood type to be? Thanks, in advance!
Added:
Cheryl Greene
This is a rather complicated one, but let’s break it down:
Keep in mind, it’s not uncommon for blood test results to be in error — either the test is not done properly, the results are recorded or reported in error, or they are remembered incorrectly. For instance, if the father in this scenario is really A+ instead of A-, the mother of both children (one with A- and one with A+ blood types) could be A+, B+, AB+ or O+.
Hope that helps,
@MsGreene
Added:
Yog
Hello,
I heard that male having blood group ab+ and his wife having blood group as b+ will surely cause problems to the kid after the baby is born.. Means the kid’s immune system will be less strong, chances of having deaf baby,etc
I know I should not believe such talks but this really worries me..
Can u please guide me.
Thanks in advance..
Added:
osama
If the dad has A+ type and the mother has B+ type…
Is it possible that there child would has O- type? And y?!
Thank u 4 answering :)
Added:
Zak
Can the child blood group be B POSITIVE If father has O POSITIVE and mother has A POSITIVE?
Added:
Cheryl Greene
That is not considered a possible combination.
Before jumping to any conclusions, it’s wise to have all three blood types re-checked. It’s not at all unusual for one of the three to be different than what’s reported. There are several reasons for this — error at the lab, mix up of blood samples, error in reporting, error in recording, etc.
Hope that helps,
@MsGreene
Added:
Alyssa
If I’m A negative and the kids father is positive blood type. 2 of our children has positive blood types, is it possible for us to have our 3rd baby boy and for him to be A negative like me, his mother?
Added:
Cheryl Greene
Alyssa,
Yes, it is possible for an A- mother and a + father to have children who are either + or -.
Best, @MsGreene
Co-founder & Executive Producer DrGreene.com, Mom
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner, but I am a not doctor. Please keep that in mind when reading my comments and replies.
Added:
Kim
If moms blood type is o+ and dads is ab+ can the childrens blood types be o+ and b?
Added:
celine
Hi Kim,
did you get an answer to your question, my son has the same problem he one daughter B- and the new arrival is O neg, he is AB neg and his partner is O neg, is the O neg baby his?
Added:
Marlene
I am B+ and I have believed my husband to have O+. My oldest daughter is a B+ and the youngest is O -. My mother in law is O -. Is it a recessive gene?
My daughter is under the assumption that her father must be a rh negative.
Added:
Margaret
My husband is O+ and mine is O+. Can we have children?
Added:
Cheryl Greene
Based on those blood types, there is no apparent reason not to try to have children. There are no health risks associated with two people who have the O+ blood having children.
Added:
jb
If the father is a b or ab positive could he have a o negative child?
Added:
jb
If the baby is o negative n the mother is o positive what is the father blood type likely to be?
Added:
Randy
If the pregnant women has rh negative blood. Can a non Invasive paternity test still be properly perform.. the day baby’s DNA is in mother blood while pregnant but if baby is positive and mother is rh negative how would that work? Or it it chromosomes in it not cells….thanks …please answer
Added:
Elizabeth
If my mother’s blood type O- and mine is B+ what blood type would my father have to have.
Added:
Cheryl Greene
If one parent’s blood is O- and the child is B+, the other parent would be B+ or AB+ blood type.
Hope that helps!
@MsGreene
Added:
Merlith Fulkerson
Hello, i have a question and hoping i can get an answers here…. My blood type is A+ my mother is Type B and my father is type O,what does it means? thanks…
Added:
Melissa
That means you need to talk to your Mom… I had the same situation.. I am AB+ and father is O- NOT POSSIBLE!!!
Added:
jen monasque
hi dr.greene is it possible that my blood type is O+ and my parents has the blood type A+ and AB+?
Added:
Cheryl Greene
Hi Jen,
If one parent is A+ and the other is AB+, each of their children could be A, B, or AB, Rh+ or Rh-. The only blood type their children can not have is O.
In a situation like yours, it’s wise to have everyone retested before jumping to conclusions. It’s not unusual for one of the parties original blood type to be different than what is reported.
Hope that helps,
@MsGreene
Executive Producer, DrGreene.com
Added:
Lisa
If my brothers blood group is A- and his partners is A- how can the baby be O+
Added:
Cheryl Greene
If both parents are A-, there is a 6.25% chance each of their children could have type O blood, but all there children will be Rh-. If one parent is A+ and one is A-, each child would have a 75% chance of having Rh+ blood. It is possible that one of the blood types was in error, reported in error, or remembered incorrectly. Before jumping to any conclusions, it’s wise to have everyone retested.
Hope that helps,
@MsGreene
Added:
rod
my brother is blood type ab and my blood type is o. is that possible that we both have same parents.
Added:
David Duobah
Hello, l am ‘A’ Negative and l’ve started having children. Still single, not involved with sex yet, l’m 27 years old. What’s the possibility that l’ll have a child?
Added:
Harmony
Hello, i’m AB but my mom is AS and my dad is AA. I was wondering- how this is possible? (I’m sure my parents are both my biological parents.)
Added:
MAINGA
Add your message here
Hi .Doctor i have blood group o- and my wife two be she has blood group A+ is there any difficulty on giving birth for our future child’s if there is what could we do?
Added:
yusuf khan
hi dr my blood is B+ and my wife is A+ so what is blood type cheldrans can we get
Added:
Cheryl Greene
With that combination, your children could be A, B, AB or O and Rh- or Rh+. Basically, this combination doesn’t eliminate any blood type. The type that is most common for a child with one parent who is B+ and the other who is A+, is AB+. But Any type is possible.
Here’s an interesting article for you on the topic Blood Types 101: An Introduction to ABO Blood Types and the Rh System.
Hope that helps,
@MsGreene
Added:
liz
Can two parents with a negative make a child with o blood type.
Added:
Cheryl Greene
Hi Liz,
Yes two parents with Rh- blood can have a child with O blood type.
The Rh and ABO systems are two separate systems. For a full explanation see Blood Types 101: An Introduction to ABO Blood Types and the Rh System.
Hope that helps,
@MsGreene
Added:
Ami
Hi
I am O negative and my mum is AB negative. Is this possible? Also, what must my after be if I am O negative?
Added:
Ami
Father*
Added:
Cheryl Greene
If one parent is AB, her children can be A, B, or AB because that parent can only pass along A or B, so no matter what the other parent is, the child will have either an A or a B gene from the parent who is AB.
Hope that helps,
@MsGreene
Added:
charlotte
i am o negative … what possible blood groups could my mum and dad be? i know my mum has a negative group and my dad has a positive one but just not sure which ones exactly
Added:
ankur soni
If husband has blood group as A+ and wife has O+ then can there be any complications during child birth.?
Added:
Cheryl Greene
I wonder if you are worried about Rh incompatibility. This is an issue when the mother has Rh- blood and the father has Rh+ blood. That does not appear to be your situation.
I hope this helps,
@MsGreene
Added:
SHIJIL
My Mother is A positive and My Dad is O positive. . . But my blood group is A negative. can this happen???
Added:
Cheryl Greene
Yes. If one parent is A+ and the other is O+ each of their children have a 75% chance being blood group A and a 6.35% being Rh-.
@MsGreene
Added:
Loraina
I have type A+ and my children’s dad had either A or O +. We have 2daughters that are A -. Our son is o+. Where would the .. A negative come from . Thank you.
Added:
Parkavi
What will happen if i marry my Mom’s younger brother with same blood group?
Added:
Cheryl Greene
Two parents can have the same blood group without issue, but there can be genetic issues when two parents are closely related.
Added:
sunny
Greetings Dr.
Is it possible for O positive parents to give birth to O negative child. if yes/no how/why.
Added:
Kelly Ann
Ok so my mom is ab- my brother is a+ we don’t know what blood type my father is but i assume he’s +. I’m o+ my boys are all o+ which isn’t a surprise since their father is o+ too. I know my mother is my biological mother so can I be one of the rare mutations. And if i do have a rare mutation or whatever do i have to worry about any health issues or greater risks for diseases
Added:
KISHONE.TPM
sir, my blood is A+ my wife blood is b+ and my child blood is b- ,how come this type blood
Added:
Nina
Hello,
I have AB+ blood while my mom has O+. My dad’s not sure of his own blood type. I’ve been doing some research and I keep seeing that it’s impossible for a parent with O to have an AB child. Is this a mutation?
Thanks!
Added:
Barb
I have the same question my dad had O blood type my mother A- and I have AB+ Blood type. Question is it possible for an O to sire a AB+
Added:
Cheryl Greene
For a child to have AB+ blood type, they have to get an A from one parent and a B from the other. Type O can only give O, so can’t be the parent of someone with AB blood type.
Before jumping to any conclusions, all three parties should be retested. It’s not unusual for one of the three to be in error.
Hope that helps,
@MsGreene
Added:
Mary
Hi,
My mum is B+ and my father is O- but I am a A+ and my twin sister is B+. All of my other siblings are B and O. Is this possible?
Added:
aryan patel
when father and mother are blood group O positive then child blood is B positive, it is possible or impossible ?
Added:
munna patel
when father and mother are blood group O positive then child blood is B positive, it is possible or impossible ?
Added:
Jayasri
my blood group is B positive and I’ ll get married A1 positive blood group person. anything problem in my child
Added:
Tia Patterson
1. If my mom is AB- and I am B-, is my dad a positive or negative O? I know that he is in the O blood group, but I don’t know if it is positive or negative.
2. I also have heard that ethnicity factors into the determination of blood type. My mom and dad’s families both are mixed with white, black, and Native American. Since AB- is a rare blood type, does this tell you anything about mom’s heritage?
Added:
Cheryl Greene
Hi Tia,
As I’ve said on this thread many times, I’m not a doctor or a professional scientist. But I find this topic fascinating and am happy to help when I can. I know based on our current understanding of science, if one parent is AB- and a child is B-, the other parent could be A-, B-, AB-, or O-. I don’t have enough background in this topic to address the ethnicity question. Can anyone else on this thread? I think it’s an intriguing question.
Best,
@MsGreene
Added:
Muhammad Hussain
Hi Tia
First of all your father can be A or B or AB or O but, you said that I know my father is O group but i don’t know, it is positive O or negative O.
The answer: your father must be O positive.
please check out this link and look at the table.
http://www.drgreene.com/qa-articles/blood-types-102-role-ab-groups-determining-paternity/
Added:
rameez
My blood group is O-ve and my lover blood group is A-ve it’s eny problem for our children
Added:
Cheryl Greene
Hello Rameez,
You may have heard that women with Rh- blood can have an issue with their blood being incompatible with their baby’s. Dr. Greene has written about this to another reader: How To Determine and Manage Rh Incompatibility. The problem occurs when the mother is Rh- and the father is Rh+. If untreated the outcome can be very serious so it is worth double checking both your blood types to be sure your partner isn’t Rh+.
If a woman is Rh- and her partner is Rh+, there are treatments that can be given to prevent (99% effective) issues during pregnancy.
Best,
@MsGreene
Added:
munna patel
when father and mother are blood group O
positive then child blood is B positive, it is possible ?
Added:
a.razzaq
Aslam o alikum
how are you dear?
please solve mine matter….
my blood group is b+ve and of my wife is O-ve. yesterday i along with my wife went to l gynecologist. she told we should visit to her clinic for delivery case which is much far from us. in addition she told some complication may occur due to this combination of blood. now i am in little bit suspense. please guide me, can any complications occur in this type of blood combination???????
and in addition what is about thylosemia cases?
she
Added:
Cheryl Smith
I am 39 and my sister is 42. All our lives we have been hearing rumors that our father is not our father. My sister and I both have AB- blood. I read somewhere that BOTH parents must have a negative rh factor to have a child with ab- blood. Is this accurate?
Added:
ann
If the father is AB- and the mother is O+ can the child be B+?
Added:
Cheryl Greene
Yes, this is a possible combination. There is a 50% chance that each child of parents who are AB- and O+ will be type A and 50% will be type B. 75% will be Rh+ and 25% will be Rh-.
Hope that helps,
@MsGreene
Added:
naresh nayak
if both parents are blood group O
positive ,
and my child is B positive, it’s
possible ?
Added:
Cheryl Greene
This is not considered a possible outcome. DNA testing is much more sensitive than blood type testing. You might consider that if you’re concerned.
Added:
naresh nayak
sir, plz tell me – what i do?
Added:
naresh nayak
How much chance of having a baby is not mine?
Added:
Dave
My mother’s blood type is AB, while my father’s was A+, yet I have blood type O-. How does this occur? Our blood types were accurate. In fact, my father was a phlebotomist. My high school biology teacher also tested us and found this accurate. He said it can occur, but never explained how.
Added:
mother
I am O Negative and my daughter is O Postive.. her father doesn’t know his so what could her father’s blood type be?
Added:
Cheryl Greene
If one parent is O- and his or her child has O+ blood, the other parent can have A+, B+ or O+ blood.
Best,
@MsGreene
Added:
rahul raj
If both parents have blood group ab+ can they have their child with blood group O+ or O- ?
Added:
Cheryl Greene
Type AB+ is fairly rare. Only 3% of people in the US are AB+. AB- is even rarer, with 1% of US people. Individuals with AB+ blood are considered a universal plasma donors.
Two parents with AB+ blood can have children with A+, A-, B+, B-, AB+ or AB- blood types. O+ and O- are not considered possible blood types for children of two AB+ parents.
If your parents give blood, they will have their blood types confirmed.
Hope that helps,
@MsGreene
Added:
Tina
I am O- and my daughter is O+ and my son is A+ do they both have the same father? Is it possible?
Added:
Cheryl Greene
It is possible. The father would have to have A+ blood type.
Added:
Dawn
If dad is o+ daughter is o+ what could mom be? Sibling to mom is b+ if that helps
Added:
Cheryl Greene
If one parent is O+ and his or her child is O+, the other parent could be A+, B+ or O+.
Added:
naresh nayak
if both parents are blood group O positive ,
and my child is B positive, it’s possible ?
Added:
Nichole Warner
So according to this it’s impossible that my Father is really my Father. Anyone know if there is a way to look up my parents blood types to be sure I am remembering correctly what they told me they were as my Dad is deceased
Added:
Cheryl Greene
Nichole,
It’s very common for people to remember a blood type incorrectly. It’s not rare for it to be recorded incorrectly. Without your father being able to provide a current blood sample, you may never know for sure, but you may be able to get access to his medical records depending on how long he has been deceased. Those records may or may not contain his blood type.
Best of luck,
@MsGreene
Added:
Scotti Brown
I know my mom is A+ and I am O negative, so what does that make my dad? Because charts I have looked up says that he is most likely to be either A, B, or O
Added:
Tracy
Can a A-mother and an B- father produce an B+ child?
Added:
Cheryl Greene
According to the current genetic thinking, this is not a possible combination, because two Rh- parents can not have an Rh+ child.
It is not uncommon for testing of one of the three parties to be incorrect or reported incorrectly. Additionally, what we “know” about science changes every day.
DNA paternity testing is considered to be highly reliable.
Hope that helps.
@MsGreene
Executive Producer and Co-Founder DrGreene.com (not a doctor)
Added:
Michele
My mothers blood type was a negative, fathers o positive. Mine and 2 brothers blood type is o positive. Another brother type is ab negative. Does that mean he has a different father?
Added:
Saonly mukherjee
Father a+VE mother b-ve is it possible for son to have b+ve.
Added:
Cheryl Greene
Indeed it is.
Added:
Name
If the dad is A- and the mom is b+ would it make since for the son to be Ab+ it makes since to me but the father seems to think it’s not possible.
Added:
Cheryl Greene
There is a 56.25% chance that each child of a parent who has type A blood and a parent who has type B blood will be AB. There is a 75% chance that a child of a parent who is Rh- and a parent who is Rh+ will have Rh+ blood.
Based on the article above, does that make sense to you?
Best,
@MsGreene
Added:
George
Hello I have a question my mother is o+ and father ab+ my sister is b+ and I’m ab+ is there a possibility that my father isn’t my biological father ?? And if we take a test and he is would I be the first case that the chart would have been proven wrong
Added:
Cheryl Greene
Blood types can not prove paternity. They are very general. DNA results are used for specific paternity testing. However in the scenario above (one parent is O+ one is AB+) the charts indicate each of their children have a 50% chance of being A, a 50% chance of being B and 0% chance of being AB. Each child has a 93.75% chance of being Rh+.
As you indicate, the charts may be wrong.
There are several reasons, errors in testing, errors in reporting, errors in memory of the people who were told their blood types in the past, our science is incomplete.
I don’t know if you would be the first person to prove the charts wrong or not, but even if you aren’t, keep in mind, tests are flawed and we learn new things about genetics every day.
Hope that helps,
@MsGreene
Added:
Mary Duckworth
Hello! My daughter have blood type “O” and me is bloody type “O” as well but my husband have a blood type O+ it can be possible that he is not the real father?
Added:
Lorquenzia
Hi I’m the mother and Im a O+ And my son is a O+ but I don’t know what is the Dad blood type can you help me find out what is the blood type of the father may be.
Added:
Cheryl Greene
If one parent is type O+ and his or her child is O+, the other parent could be O+, A+ or B+.
For a full explanation see Dr. Greene’s post: Understanding Blood Types.
Added:
tasha
Can both parents be A+ and child be AB
Added:
Darla
My son is o- . His girfriend just birthed her 3rd live child, 5 total. She is o+. She did not get rogaine shots. Baby is o+. Is this possible? Urgent.
Added:
AK
Yes there is 50 % chance of the offspring of parents who are positive and negative to be positive.
Added:
Deepa
My group is b positive my husband group is o negative my child group is a2 positive. Is it possible
Added:
Deepa
My group is b positive my husband blood group is o negative my daughter blood group is a2 positive. Is it possible sir
Added:
Deepa
Sir my blood group is b positive and my husband blood group is o negative. My daughter blood group is a2 positive. Why it happens
Added:
Israel Garcia
I did not have my parents blood type but my dad’s sister did
Added:
deedea
Hi. I’m a daughter with a+ dad a+ my brother a+ my mom is D. What does this mean?
Added:
Donna Sullivan
I have o positive. My dad an my mom rh factor, can I be some one else’s baby?
Added:
Cheryl Greene
You do not provide enough information in your comment to be able to respond. Sorry.
Added:
Md. Sabbir Ahmed
If father’s blood group is O+ and Mother’s is A+. Will there be any problem with their child?
Added:
Patrick
no there will not be a problem with the child
Added:
Joanie
My dad is AB+ and mum is O neg and I’m O positive is this possible
Added:
Sadhana
My husband blood group is O+ve and my is b-ve. There is any complications to get pregnancy? What will my child blood group.? Plez help me out…
Added:
AK
It can be B+ve, B negative, O positive or O negative.
You need to get injection rhogram in case your offspring is Rh +ve or it will complicate your next pregnancy.
Added:
ilayaraja
any problem
Added:
Holly
Can a male O- male blood type have a child(ren) with an AB+ female?
Added:
Hugo
Based on what I have read the probability is zero. On the other hand my mother is AB+ and swears her father was O-. They are mirror images so no doubt he is the father and I look just like my grandfather too but only God knows..
Added:
harish
My blood group is A+ and my wife blood group is AB+ . what could be my baby blood group?
Added:
Cheryl Greene
Children of an A+ and AB+ parent could be A +/-, B +/- or AB +/-.
Added:
khurram parvez
HI.. iam 35 yrs old and i do not get child since my marrige (2.5) yrs. i checked that my sperms count is nil……so plz.. advice me what to do.
thanks.( india)
Added:
AK
Adoption is a good alternative if you cant have kids
Added:
Sharla
Hello Dr.green I’m in the need of help to get a DNA paternity test while pregnant can you only use the mothers blood ? just the blood and not the fluid? …or do you need to have the fluid that the baby floating in .. to see who the father is? I know I need his DNA ? And is it possible to have the results in 3 to 4 days
Added:
Andy
Hello Dr.
My friend she is a female….. her father blood group is A( ve) and her mother A(-ve) & her blood grp is AB
is it possible?
Added:
IVF Mom
Hello..
2 years ago my husband and I began IVF treatment and got pregnant with our now 15 month beautiful baby boys.. My husband is O+ and I am O-.. When we were in the hospital after having the boys, we were told their blood types were A+ for both, it didn’t make lots of sense to me at the time (without ever having read on the subject) but I didn’t dwell on it.. Also, the doctor said to retest the boys when they were older since markers sometimes evolve with age.. That was it.. Now my husband and I will probably get divorced and I want to know if there was a possibility of an error during IVF procedures, since I am afraid one of us may not be biological parents.. I know if it is me he will be more on the offense to take the kids, and if it is him he won’t even try.. I love my babies with all my heart regardless.. Anyway, how can our babies be A+ and still be ours? Or is this a definitive proof that there was gamet error during IVF??
Added:
Shirley Cooper
They may be both of yours! I gave birth to three beautiful children that have A blood types. Their father and I are both type O. A paternity test was done and all three are ours. Sometimes, although it is very rare, mutations take place and babies can have a different blood type than that of their parents.
Added:
Mike
Hello I am A pos and the girl I have slept with is A pos. We slept together at the beginning of the month and used protection and a week later she had a period but the slept with another man who is O negative towards the end of the month they had unprotected sex. But got pregnant towards the beginning of the next month and the baby came out O positive she says I might be the father is this true?
Added:
AK
A+ and A+ can give O+
A+ and O- can also give O+
So chances are it can be either’s.
Added:
Aloh
Hi my father is AB+ he was hospitalized and he undergo blood transfusion when i tried to replace the used blood form the hospital i was shocked that i have blood type O+ my father is AB+ why is it my blood type is O+.does this mean that my father is not my biological father.
Added:
ciara
If the mother has o+ and the father has B+ and they have twins, one twin has o+ and the other has A I’m not sure if it’s A+ or – would he be the father
Added:
Cheryl Greene
If one parent is O+ and the other is B+, each of their children will have an 18.75% chance of being blood group A or B, a 56.25% chance of being blood group AB, and a 6.25% chance of being blood group O. Each child will have a 93.75% chance of being Rh+ and a 6.25% chance of being Rh-.
What does this mean for you? First, in the example above, the twins can not be identical because they have different blood types. Second, you can not rule out a possible father of these two fraternal twins because he has B+ blood. A DNA test is typically used to determine paternity.
Hope that helps,
@MsGreene
Added:
Rita Amoo Gottfried
please I won’t to know if both parents
are o positive, how healthy is their children
Added:
Cheryl Greene
If both parent have type O+ blood, their blood type won’t have a negative impact on the health of their baby. There are many other factors that can make a difference in the baby’s health, so it is impossible to determine the health outcome of their children, but blood type incompatibility should not be an issue.
Best,
@MsGreene
Mother & Co-founder of DrGreene.com
Added:
Michael
Hello DR,
My blood type is ab+ and my wife is O+ we recently had a son who is ab- but I keep hearing this is impossible?
Added:
Cheryl Greene
If one parent’s blood type is AB+ and his or her child is AB-, the other parent would need to be A+, B+ or AB+.
In your case, it sounds like the three of you need to be re-tested.
@MsGreene
Added:
Lyrika
My information/situation is identical to that described by Michael. I am annoyed, offended and suspicious of the “doctor’s” response, as it is dismissive and megalomaniacal, suggesting that ANY human knows without question what is and is not possible in the realm of human genetics. In this day and age, when any informed person must realize that anything is possible and that almost nothing is in actuality explained or understood by medicine or science, it’s essentially an exercise in futility to hope for real answers from adjutants of our current, highly suspect system of dis/misinformation. The AB- blood type is allegedly the rarest on Earth, and children with this blood type ARE being born to parents without rh- blood. That is fact. I tend to think the claims of so called “medical professionals” indicate either they are not willing to admit they don’t have all the answers, or they are lying for reasons we can only, at this stage, speculate about. I would urge Michael, and anyone else in this situation to exercise caution and patience…science and medicine have a long history of hubris and inhumanity, and are part of a system designed to profit from our pain and illness. The answers we seek will likely not come from this sector. If you love your child, then love your child. Make his/her care and protection your priority.
Added:
Cheryl Greene
Hi Lyrika,
First, thank you for your very apt response. We know so little and are finding out more all the time.
I do need to correct you on one point — I am NOT a doctor. I do respond often on this post and I try to make it clear that I am a mom, an interested citizen, a casual scientist, but NOT an authority.
I hope you and Michael will accept my apology if I did not make that clear.
In re-reading my response, perhaps I should have qualified it with “as far as we know at this time”. So much of what we know is evolving.
Best,
Cheryl Greene
Mom, co-founder DrGreene.com, NOT a doctor
Added:
Lyrika
Hello, Cheryl, and thank you for your reply and clarification. That you describe yourself as a ‘casual scientist’ actually gives me some hope that your mind (and heart, more significantly) is open to possibilities, and that you are not subject to the controls and threats under which mainstream doctors and scientists too often must operate. After my post, I visited a site dedicated to current genetic research and was happily surprised by the statement that nothing in genetic research is black and white, and researchers are daily discovering exceptions to “rules”. I spent hours there and will return to do more reading, it is a vast and fascinating subject, and truly demands an open mind and willingness to question all we think we know. Ultimately, I feel, when it comes to parenting, the only essential choice is love. I think to hang our willingness to do so upon a theory touted as fact is a huge error in judgment, and can have far reaching and tragic results for both parents and children. Please, people, invest in your own learning process, do not consider the opinion of anyone, no matter how learned they might claim or appear to be, as the final word on any subject…everyone walks their own path and has their own agenda. We are responsible for our own path, and it’s been my experience that it is not only difficult but dangerous to walk in the dark, or with our eyes closed.
Added:
Lyrika
Sorry for this blurb, it should have been part of my previous post. For those who want to investigate blood types and/or genetic research in general, I think it’s a pretty godd place to start: http://genetics.thetech.org/genetic-categories/blood-types
Also I would like to say to Cheryl, no apology is necessary, not to me. You are trying to help people, and so very many simply do not bother. I apologise to you, for my assumptions. Be well, love light and truth to you and yours.
Added:
Victoria Andreenkova, Dublin.
I wish to know what my sons father blood group type is, (1) Mother = B rh negative, (2) Child = AB positive.
What would be then the fathers blood group type?
Added:
Cheryl Greene
In this scenario, the second parent could be A+ or AB+.
Hope that helps.
Added:
Victoria Andreenkova, Dublin.
Thank you doc, yes it could be only A+ or AB+ I reckon its A+ as AB+ is relatively a rare type, I think only 4 percent of the world population has that type. I am in a paternity dispute whereby the father is denying that he is the father of my son, can I request his blood type so it will be obvious to the judge that he is the father, I am afraid that he might fraud with the DNA process by letting someone else go for the paternity testing. In the event that the DNA results come back negative I then can tell the judge that my son shares same type blood group so that the judge can force the father to reveal his blood group would you think that this can reveal that he is the dad as AB+ would be a very rare blood type, I am not too sure if A+ is?
Added:
Egbodofo mary
Im AA and my husband is AS, we have a son with AC hw is that possible?
Added:
Appiah Ebenezer
Please I want to know if the the father of a child is O nagative and the mother is O positive how healthy will thier children be?
Added:
Cheryl Greene
There are many factors that determine the health of a baby, but I’m guessing you’ve heard something about blood type incompatibility.
Typically this is not an issue with a first pregnancy, but it can be a problem with subsequent pregnancies. It is wise to discuss this with your doctor as there are treatments available. It’s great to bring this up as soon as you can, even before you become pregnant.
Hope that helps,
@MsGreene
Added:
kenji prollo
My mother’s blood type is o, and my father is AB. what is my possible blood type doc? and for my brother. thank you
Added:
Cheryl Greene
The children of an O parent and an AB parent will be either A or B.
Hope that answers your question.
@MsGreene
Added:
Jonz
Hello…I am A+ and I have one son who is O+ and another son who is A- by the same person. What is the father’s “possible” blood type?
Father’s mother is AB+
My mom is A+
Added:
Cheryl Greene
Interestingly those blood types don’t narrow the possibilities down much.
If one parent is A+ and has two children, who have the same parents, and the children are O+ and A-, the other parent could be A+, B+ or O+.
Added:
anupam
I am O+ , my wife A negative , my first baby A+ , i dont no inj Anti D given or not at time of first delivary , we want a 2nd baby , what treatment is requir ?
Added:
Isaac
Good morning Dr. Please, i wanted to know if my gene is B+ and my girlfriend is also B+ can we get marriage and what will be the r results of when she become pregnant till the baby come out. I am really worried and i really we really love ourselves, so advise us of what will do to protect the baby when she come pregnant too.
Thanks Dr.
Added:
karun
Father with AB -ve and mother with O+ve . What are the precautions to be taken while pregnancy?
Added:
Cheryl Greene
Discuss this with your Ob. Typically there is no issue with first pregnancy, but your Ob will discuss your options with you. It’s smart to bring this up before getting pregnant or as early as you can.
Added:
anna
hello…
a mother is O positive.. husband is A positive
our baby born is A negative… how is it possible
help…
Added:
Cheryl Greene
The children of an O+ parent and and A+ parent have a 6.25% of having Rh- blood. For a full explanation see Dr. Greene’s Q&A Blood Types 101.
Added:
Shakia
My boyfriend is B+ and I’m AB- would this be a cause for concern or are we okay? He’s very concerned with genotype but I just want to know if our RH factors would clash and cause issues?
Added:
Cheryl Greene
Typically there is no issue with a first pregnancy, but you should discuss this with your ObGyn. It’s great to bring this up as soon as you can, even before you become pregnant.
Added:
rafiu
i am o+ my girlfriend is o and he gave birth to a child claiming that i am the biological father and the child blood group is B- how is it possible that i am the father can u please enlighten me more please.
Added:
Cheryl Greene
I’m sorry, I want to make sure I am following your question. Are you saying:
– You are male and have O+ blood.
– Your girlfriend has O blood type, but you don’t know + or -.
– She is claiming you are the father of her baby.
– The baby is B-.
Added:
cherry
If I am B- and my husband is b+ are there chances of complication in pregnancy also is it difficult to conceive if my husband is 35 +
thanks
Added:
Cheryl Greene
This is an important topic to bring up with your ObGyn. She will work with you to make sure you have the treatment you need before there is an issue. It is wise to discuss this with her before you conceive. It’s not necessary, but wise.
The age of both parents can influence infertility. In general it’s easier for younger people to conceive, but there are many examples of older (much older than 35) people conceiving without problem.
Hope this helps,
@MsGreene
Added:
marriage4me
Female blood group is O+ which blood groups (male) matching for marriage? kindly explain
Added:
Tayden Dalley
Hi, Sir. My wife and I at both O- and she is rh- we were wondering if we would come across any issues being that were both o-.
Added:
sana
Me having o positive and my husbund O negative now im pregnant 9 weeks any problem yo child…
Added:
Laxman
Hi Doc,
My wife is o+ve and i am o -ve . is there any risk in child?
Added:
Esther owusua
Dr can A+ n AB- give birth?
Added:
Noon
Hi Dr;
If my both father and mother having O+ can I have an O- ?
Added:
Cheryl Greene
Yes, that is a possible outcome.
Added:
ANY
IF MY WIFE IS O+ AND I AM A+WHAT WILL OUR CHILDREN BE IRRESPECTIVE OF NUMBER
Added:
Cheryl Greene
The children of parents who are O+ and A+ can be either A or O and either + or -. The highest likelihood is A+, but all the other combinations are possible.
Added:
shanie hill
I just want to know if my husband is A+ and I am B- what will the childrens blood group be.
Added:
Cheryl Greene
If one parent is A+ and the other is B-, their children can be A-, B- or AB-.
Added:
Balaji
If Father is A negative and Mother is AB Positive what will be the Child’s blood group combinations with RH factor
Added:
Cheryl Greene
If one parent is A- and the other is AB+ their children could be A, B, or AB and + or -.
Added:
M.M.S
Dear sir!
My brother’s blood group is B+ and his wife also has the same blood group B+ve. They have three children. All the children have the same blood group B+ve. The 1st one child is normal while the other two children are abnormal. What would be cause of abnormality? Is it due to blood group incompatibility or would be any other cause?
Added:
Cheryl Greene
If both parents have the same blood group as the children, there shouldn’t be a blood group incompatibility.
Added:
Ronnie
Myself , my full sibling brother and my mum are all o+ we do not know our fathers blood group (DECEASED).Is it possible we have a half sibling sister who is AB-? We do not know her mothers blood group
Added:
Cheryl Greene
In the scenario you mentioned, it is possible. Here’s one way it could work (NOTE: there are a lot of assumptions in this scenario – it’s just an example) —
This does not mean you have a half sibling. But your known blood groups do not rule it out.
Added:
Ronnie
Hi myself my full sibling brother and my mum are all o+ . I have a possible half sibling by my father who is AB- (. we do not know our fathers blood group ) . Would it be possible that we are half siblings?
Added:
M.M.S
Hy sir!
If a blood type O+ve man married to O+ve woman. Is There any issue of diseases of abnormalities in childs.
Added:
Cheryl Greene
This blood type combination does not cause any health issues in the child.
Added:
Emily
I am O+ and my husband is B-. Would that cause for any issues for our future children?
Added:
April
I an O+ and my husband is O+, our child is O+, is there any other combination that would make an O+ baby?
Added:
Cheryl Greene
If one parent is O+ and the child is O+ the other parent could be A+, B+ or O+. Does that answer your question?
Added:
Ridhi Bhatnagar
Dr. my blood group is O+ and my husband blood group is also O+ but my son blood group is B+ is this possible ?
Added:
Cheryl Greene
This is not a “possible combination”. But as Dr. Greene points out, there are rare genetic mutations.
It would be smart to have all your blood types retested. If they all come back the same, a paternity test could give you further information.
Added:
Maritza
Dr I have the sane situation mom and dad have 0+ and our son ia B+ … And Im 100% sure that my husband is the father of my son… Do I need to worry?
Added:
Cheryl Greene
It would be wise to have all three blood types re-tested. It’s not unusual for one of them to be reported in error.
Added:
Mamerto
Hi Doctor. What blood types of parents that produce an O blood type
Added:
Cheryl Greene
The parents of an O child could be A, B, or O, but not AB. Examples:
A & A
B & B
A & B
A & O
B & O
O & O
Added:
Mike
I’m the father of 3 children & not one of them have my blood type, as a matter of fact my son and both daughters match my wife’s blood type. Is that possible? Mike
Added:
Cheryl Greene
Yes, that’s possible. The odds for blood types are for each child and are averaged over large sample sizes. Here’s an example – if a mother was A+ and a father was O+ each of their children would have a 75% chance of being type O and a 93.75% chance of being +. That doesn’t mean that if the couple had four children one would be type O. The odds are reset with each child. Does that make sense?
Added:
Anna Wepener
My blood group is O+ and my husband is A+, can we have a child that is O-?
Added:
Cheryl Greene
O- is one possible outcome if one parent is O+ and one is A+.
Added:
Kathleen
I was told that my newborn is A+, my husband is b- and I am o+. Should I get her retested?
Added:
Cheryl Greene
It would be wise to have all three of you retested. As the mother, you know if there is only one possible father and who is he. If the tests don’t line up, either the tests are wrong or you have a very rare genetic anomaly that would be great to discover early.
Added:
X
is there any possibility that a B negative child can be fathered by O positive person if the mother is A positive ??
Added:
Cheryl Greene
You are correct that this is not a combination that is considered possible. As Dr. Greene points out above “These are general rules, though, and exceptions apply. Very rarely, gene mutations may change the rules such that “impossible children” become possible. Today there are over 600 blood types known (as well as other tissue types called HLA types), which can make paternity testing far more accurate — but still not perfect.”
Another possible explanation — one or more of the blood types could have been recorded in error, the test could have been false, or someone’s memory of his or her blood type could be wrong.
I hope that’s helpful.
Cheryl
Added:
Jessica
What are the chances of a O+ male and a A- female having a child that is A-? I thought the + was dominant.
Added:
Beth
Positive is dominant however the male may carry both a positive and a negative gene. The positive trait would show as it is dominant but the negative gene could be passed onto the child resulting in a negative blood type
Added:
Beth
Ok so I just did the math it is impossible to know the exact chances as the mother could have either A-,A- or A-,O- both of which would show as A-
If the mother was A-,A- the child would have 25% chance of being A-,O+ (shown as A+) 25% chance of being A-,O- (shown as A-) 25% chance of being A-,A+ (shown as A+) and 25% chance of being A-,O- (shown as A-) so
to simplify that a blood test of a child of this combination would have 50% chance of being A+ and 50% chance of being A-
If the mother was A-,O- then he child would have 25% chance of being A-,O+ (shown as A+) 25% chance of being A-,O- (shown as A-) 25% chance of being O-,O+ (shown as O+) 25% chance of being O-,O- (shown as O-) so
To simplify this a blood test of a child of this combination would have 25% chance of being any of A+ A- O+ O-
Added:
Preeti
My blood group A- ,my husband blood group B+ , my first son blood group AB+ . sir I am pregnant , what is any problems in second pregnancy . pls sir you are brief me. Thank
Added:
Jessica
Hi I am A- and my husband and 2 of my children are O+. My third child is A- is this possible? I thought the + was dominant.
Added:
Marsha
Can a mother with AB+ blood and a father with O- blood have a child with O+ blood?
Added:
Cheryl Greene
Yes, this combination is possible. For a full explanation see Dr. Greene’s Q&A Blood Types 102.
Added:
Dell
Just got a call from my daughter who donated blood today. She called to ask if I knew her blood type. I said O+. Her father and I both are O+. She said she tested A- My mother has A- and needed medications when pregnant with me because I was RH +. Perplexed. How can this be?
Added:
Cheryl Greene
It’s not unusual for one of the three test to be in error or remembered incorrectly. I would say re-testing the three of you would be the next step.
Added:
keriann
im o- and my husband is a- and my son is 0+ … can that be possible?
Added:
Cheryl Greene
You may want to have all three blood types re-tested as this is not considered a possible outcome.
Added:
Angie
My husband and I are both O-, does this mean our kids will be O- too?
Added:
Cheryl Greene
That is correct.
Added:
Anthony Hammond
Hello doctor, I am a man in blood group of A+. Can I get married to a woman in blood group of A+?
Added:
Cheryl Greene
What is your concern? Have you heard or read that this might be a problem? If so, what specifically?
Added:
Rachel
Is there any need to have Ant D injection while I have group O- and my husband has A-?
Added:
Rachel smith
Hello Doc. My blood type is a 0+ In my husband blood type is a B+ in our son ended up with 0+ does that my gene is stronger than his?u
Added:
Rachel smith
Hello Doc. My blood type is a 0+ In my husband blood type is a B+ in our son ended up with 0+ does that my gene is stronger than his?
Added:
Rachel
My group is O- while my husband has A-. Is it possible to have children with RH+?
Added:
Cheryl Greene
Only if it’s a very rare genetic mutation.
Added:
Rachel
Hi, my father has blood group AB but I don’t know whether it was -/+ and my mother has O+ but why my group is O-?
Added:
Cheryl Greene
Is it possible to recheck the blood types of all three parties?
As Dr. Greene points out above, this is not a typical outcome, but “These are general rules, though, and exceptions apply. Very rarely, gene mutations may change the rules such that “impossible children” become possible. The geneticists at Stanford wrote a great explanation to this on the website for The Tech Museum of Innovation.
Today there are over 600 blood types known (as well as other tissue types called HLA types), which can make paternity testing far more accurate — but still not perfect.”
Added:
Angela Jamerson
Hi, my blood type is O+ and my boyfriend is O-. Our child is also O-. What is the chance the baby is his?
Added:
Cheryl Greene
There is a 25% chance that a child of an O+ mother and and an O- father will have an O- child.
If you’re concerned about the paternity of your child, DNA testing is the best course of action.
Added:
Rishabh Bhardwaj
Hi, it’s Rishabh.
My blood group is AB+ and my wife blood group is B-. Because of opposite Rh factor we suffered from two abortion. Now what kind of precautions we have to take because we never want to suffered from above?
Added:
Sara
hi i am b+ and my husband is ab- my first baby blood type is b+ i had a misscarriage in my second pregnancy .. Is there any problem in our blood types.. Most importantly i want to note that i didnt take any injection after my first prevnancy .. And am planning to have a second baby now ..is there anything i need to do?
Added:
Marie
How do I find out my sons father ? Do I have to get both bloods from two dads then compare the blood types to is?
Added:
Cheryl Greene
The only reliable way to determine paternity is with a DNA test. If you are considering two possible fathers, you can test one and if he is positive, you do not need to test the other. If he is negative, the other potential father might want a DNA test to absolutely rule out a third candidate.
Blood type tests are not definitive in determining paternity.
Added:
Caroline hunter
Hi my husband is trying to go through a DNa test with whom he has been told is his father. But the man is making things difficult.
We know he is rhesus negative blood type.
My husband has just found out he is also rhesus negative.
Is this anything to go by??? Please help.
Added:
Cheryl Greene
Blood groups can offer general information, but not specific information. Blood groups can say in general it is possible for this person to be a parent if certain information lines up. It can not say this person is the parent. Only DNA testing can provide that level of information.
Added:
Pauline
I am a female & have two older male siblings.
Both parents deceased.
I am blood group : A POSS
Eldest brother : A RHESUS D POSS
Middle brother : O POSS
Are we all full siblings?
Added:
Cheryl Greene
In this scenario, if one parent is A+ and one parent is O+, they could have children who are either A+ or O+. In other words, it is a possible combination.
Added:
summer
My blood group is B positive and my wife blood group is O positive; Is it possible for us to give birth. On what percentage of change do we stand giving birth and our children’s blood group
Added:
Cheryl Greene
If one parent has B+ type blood and the other has O+ blood their children could have B or O, + or – blood types. The blood type can not be used to determine percentage chance of giving birth.
Added:
Nana Addo
I highly impressed education on blood type
Added:
khushboo
hello dr.
my blood group is O positive and my husband having O negative blood group……can i conceive baby or not????
Added:
Cheryl Greene
Your blood group will not impact your ability to conceive. There are, however, many other factors that come into play when determining you ability to conceive.
Added:
gautam
If a female has a blood group of “o+” and her husband of “a+”
what is possibility of blood group of “b+” of twins born as boy and girI. Please answer give me very fast.
Added:
Cheryl Greene
If one parent is O+ and another is A+, their children will have either A or O type blood. There is a 6.25% chance each child could be Rh-. Before jumping to any conclusions, it’s very wise to have everyone’s blood type re-tested.
Added:
gautam
I am submitting a society problem which has now become anti social habits of disputes ultimately felt into legal case before court which is as below. A male married on 30 January 2001 and suffered with diabetes in 2005 year.as per family background, his father, grand father, cousin brother also suffered with diabetes and special kind of perkinsons disease also such man using medicine of ayurvedic , allopathic of diabetes with insulin injections as 2 when needed. His blood group “a+”.his wife moving blood group of ” o + “. During pregnancy, she used ayurvedic medicines for ensuring birth of boy as desired by her husband. After seven and half months of pregnancy, twins (one girl and a boy) born having blood group of ” b+”.suddenly, husband created problem with allegations of paternity of twins on the ground of “b+”blood group with support of genetic books.one of book of genetic of your also by which husband claimed and challenged the paternity of twins to other.he also filed a legal case before court of law.
I request to kindly guide about the blood group of ” b + ” of twins and reason of it.is any effect due to suffering of diabetes insuline injection used by male and ayurvedic medicines taken during pregnancy by female also on blood group of twins as “b+”.I also request of your support due to genetic researcher and expert of your goodselve in this matter that which arguments from the side of female about blood group of twins as ” b + ” may be made before the court to save life of twins and also to get rid of bad allegations of paternity in the matter before court of law so that legal case mill be decided in favour of female on the ground of paternity in good spirits and faith of both may be made again by saying relations of husband and wife with their twins. Male always uses energy tablets since marriage. It is also submitted following of your message received- “if one parents is “o+” and another is “a+, there children will have either ‘a’or ‘o’ type blood. There is a 6.25% chance each child could be Rh-
request to simplify public language the meaning of a 6.25% chance each child could be Rh- so that it any supportive meaning received in favour of female which may be submitted before court of law.
Added:
Cheryl Greene
In this case, DNA should be used to determine if this man is the father or not. The tests are fairly easily accessible and reasonably priced in the US, Canada, and Europe. I don’t know about the rest of the world. Blood type alone can’t determine paternity for legal purposes.
Added:
gautam
Resp. Sir
thank you very much for your reply dated 24th August 2015 .sir we do not agree to DNA test at this stage due to children are having age of 8 years and their elder sister is 14 years old who knows the merits and demerits or prons and cons of DNA. Hon’ble high court of Rajasthan ,Jaipur has given an verdict that children will have bear the results of DNA so DNA not allowed such test .I have asked about blood group of ” a + ” of male ,”o+”of female and twins are “b+”.kindly give me any helpful reply which may be quoted before court of law so answer must be supported legally and can be argued before court of law up to its satisfaction resultant.
Added:
Cheryl Greene
I am sorry for your situation, however, with regards to blood types and paternity, I will quote from Dr. Greene’s article above:
Added:
Newton
what are the chances of having healthier babies when blood groups are B+ and B?
Added:
Elvis
Dr, I’m sort of convinced my fiancé is RH O- while I’m B+. What are the chances of us having healthy babies?
Added:
Christina
If I am o- and my sons father is o- is it possible he’s not my sons father if he is also o-??? I have researched everywhere and I have not found and an answer! Please help!!!
Added:
Cheryl Greene
What is your son’s blood type?
Added:
Jane
If both parents are O the child has to be O.
Added:
Sakib
Doctor…..my wife’s and my blood group is o positive….and we are bloood related person.is there any problem to have a baby??
Added:
sushil
My bloodgroup is B positive, my wife bloodgroup is B positive. What is my child”s blood possibilities? Please, urgent.
Added:
Cheryl Greene
Two B+ parents can have children who are blood group B or O and be either + or -.
Added:
SP Asapu
Hi, My blood group is A(+ve) and My Wife blood group is O(-ve). What will be the possible and impossible blood groups for our Children.
Added:
Cheryl Greene
There is a 75% chance that your child will have type A blood and 25% chance of type O. There is a 75% chance your child will be RH+ and 25% chance of RH-. Each child has the same odds.
Added:
Lisa trenda
Hi I have B negative blood. One of my children have B negative and my other child has o positive. They have the same father what would be his blood type.
Added:
Ebenezer Ampaabeng
Doctor, can a Mum with genotype AA and a Dad with genotype AS give birth to a child with genotype AC? Why?
Added:
Via
Hello. My blood type is A+ and my husband is B+, what are our chances of conceiving? Are we compatible?
Added:
Mamta.n Shetty
My blood grup o+ and my husband blood grup also o+
so now i am 7munths pragnant so my baby had any problem
Added:
Glenda Sainz
My blood type is 0-. My mother was 0-. what are the possiblilties of my fathers blood type?
Added:
rupesh kumar
my blood group is o negative
so what is blood group of my
father and mother…
Added:
YC
Your father can either be A or B or O but never AB
Added:
Debbie Jaime
Hello Dr. I need your help my Mother was blood type A+ father was an O+, two of my brothers are A+ and 2 sisters are A+ like mom. I am O+ but 1 brother is AB+ does this mean he is not my father’s son?
Added:
YC
Yes looks like it
Added:
tps
Can a a positive female and b negative male get married. Will there be any problems during pregnancy
Added:
tps
Can a female with A+ blood group and male with B- get married. Will threr be any problem during pregency
Added:
jenny
if mother is b- and father a- can child be o-
Added:
lu
my mother is ab + and my father o + and I am o+ it is possible
Added:
YC
Not possible
Added:
Jessica Lee
Hello, DrGreene. According to my mother blood type is AB(whether is positive or negative, I don’t know),My father blood type I also don’t know. (I think is o positive!). They don’t want to go for blood test.Mine and my brother is A positive.I am the eldest.I was borned in 1972 year. My btother is 2 years younger than me,he is ok. But i just want to know what is happened to me if my parents blood type is like this??
I am so confuse about myself and very appreciate if you can answer my question. I am from Malaysia.
Thank you so much.
Added:
Katie
I am Rhesis A – my baby has been born o- can the father be b+? Need help
Added:
Gimo
My wife has o negative our son turned out to be o negative,am o positive,,is it genuine?
Added:
Maggie
Hi,
My mother is 0-. Is it possible for her parents to be A+ and B+?
Added:
Aniket
My blood group is O RH positive & my Fiancee has A negative…what is the possibilities of having baby…with this blood group..can we have only one baby…or more?
Added:
Lucy
Can a mum who is a, dad is o make b type?
Added:
Cheryl Greene
From what we know of genetics at this time, the answer is no. However, tests are not always accurate. It’s not unheard of for one of the three tests to be incorrect.
Added:
Aref
if both parents are blood group O plus , and my child is A plus, it’s possible ?
Added:
Cheryl Greene
Yes, it is possible for two O+ parents to have a child who is A+.
Added:
YC
NO.
Added:
Beth
Ummmm… No it’s not.
Added:
Cheryl Greene
Oh, my. I must have mis-read the original question. I am chagrined. And Beth, you are correct.
Added:
Jo
Mother is A+ father is B- and I am O+. What are the chances that my father is truly my father? I know my mother had other partners in the same time frame, I can’t get DNA, as my father is deceased. Thank you.
Added:
Cheryl Greene
Odds are an interesting thing in blood types. I can tell you that the odds of a mother with A+ and a father with B- having a child with type O blood are 6.25% and the odds the child will be Rh+ are 75%. But for every child the biggest question is “can this parental combination produce “X” blood type child?” In this situation the answer is, yes.
Added:
Carly
My blood type is A +, my baby’s father is B+. Our son is 0+. Since I have never slept with anyone else since I married his dad, I can tell you it is possible.
Added:
Janelle
I’m O- for sure. My husband does not know his type. We have three children together. One is A+ and two are B+. Is it safe to say my husband is most likely AB+? I know he’s the father, no question of paternity, just scientific curiosity. Thanks.
Added:
Cheryl Greene
You are correct, he would be AB+ because that is the only blood type that could be the father of children with either A+ or B+ if the mother is O-.
Added:
mani
Hi Janelle,
don’t you come across any complications during your pregnancy as you are O- and ur husband is AB+. Did you take any precautions?
Added:
meena
hi, my blood group is B – and my husband is AB+ what precaution we have to take before pregnancy????
Added:
Shay
Hello I’m O+ and my baby is B+ and her father is B+ is that a good way to be certain that he’s her Father?
Added:
vicky shaw
sir,
I am ab- negative and my wife is o+ positive blood group ,so our born baby have any problem?
Added:
Lynnrose
My type O+ and my husband AB+ and I have sex only with my husband and my son is O+ and my daughter O+ so are you saying its impossible…
Added:
Cheryl Greene
Perhaps you and your husband should have your blood type tested again. It’s amazing how many people think they know their blood type and find out it’s different than what the believed it to be.
Added:
theresa
hi, am A+ and slept with two men… one is O+ and the other is A+.
My child came out to be O+, would like to know who have the highest possibility as her father and how many percent accuracy would that be?
I understand our parents (child’s grandparents) blood type would also affect my child’s blood type – if so how could I determine without going for paternity test?
Added:
Cheryl Greene
If the mother is A+, here are the possible outcomes:
– If the father is O+, the baby has a 75% chance of being type A and a 25% chance of being type O and a 93.75% chance of being Rh+ and 6.25% chance of being Rh-
– If the father is A+, the baby has a 93.75% chance of being type A and a 6.25% chance of being type O and a 93.75% chance of being Rh+ and 6.25% chance of being Rh-
In other words, it is not possible to know the father of the baby without a paternity test.
Added:
michelle
Halo. If I, the mother has a bloodtipe o- and slept with 2 diffrent men the ones bloodtipe is o+ and the other is a+, which blood tipe would it possibly be, so that I would know which of the 2 is the father of my baby? So confused at this stage.
Added:
Cheryl Greene
We know you are O- (and I assume you are really sure of this):
— If Dad is O+ the baby will be type O and can only be type O. 75% chance of being + and 25% chance of being -.
— If Dad is A+ the baby has a 75% chance of being type A and a 25% chance of being type O and a 75% chance of being + and 25% chance of being -.
What this means:
— If the baby is type O, it could be either father.
— If the baby is type A, the type A man is the father.
— The Rh (+ / -) does not help rule out either man.
If the baby has type O blood, DNA paternity testing can help you determine which man is the father.
Added:
Victoria
My son is blood type o positive and my boyfriend is o negative. What are the chances that he is my son’s father?
Added:
Cheryl Greene
It is possible if your blood type is A+, B+, or O+
Added:
Samantha
My mom is A positive and my dad is O positive. My sister is O positive too, however I am AB positive. Looking at multiple blood type chart it consistently indicates that an AB positive child is impossible. Is that true or is it possible under certain circumstances?
Added:
Anonymous
Dear Doctor, my father’s blood type is AB and mine is O, is it possible that he is my father? I wonder if you can send me an e-mail to this answer?
Regards!
Added:
Cindy
The father is AB+ and the mother is O+ and they have a son who is O+. These parents are both white. The mother had no other sex partners. Are you saying it is impossible for them to have an 0+ child?
Added:
Arenae
I am O+. My dad is type AB and my mom is O. Research “Bombay” blood type or hh blood type. It will give you more explanation as to why this is.
Added:
Cheryl Greene
There is a very rare blood type (0.0004% or about 4 per million in the general population) known as the Bombay Blood type. In some places such as Mumbai (which was formerly called Bombay) the occurrences can be as high as 0.01% or 1 in 10,000. This group does not fall into the ABO system and the usual tests for ABO blood show them as group O.
The Bombay blood type is usually only found in small communities where there are other people with the hh blood type. Both parents have to be h carriers, though a parent can be a carrier without actually having Bombay type blood.
If you suspect your child may have the Bombay blood type talk to your doctor about a specialized test for this blood type as it does not show up using the normal ABO blood type tests.
DNA paternity tests are still accurate (99.999%) with type hh blood and are considered the only accurate test for paternity.
Best,
@MsGreene
Note: I answer a lot of questions on DrGreene.com, I am the co-founder of DrGreene.com, Dr. Greene’s business partner and wife, but I am not Dr. Greene, nor am I a doctor. Please keep that in mind when reading my comments and replies.
Added:
Archie
My mom is B+ ve and dad is AB. I’m O positive.. Is it possible?
Added:
Cheryl Greene
I’m assuming you’ve looked at the chart on this page? If so, your real question may be, “what do I do now?” There are several options. I recommend that you talk to your mom first and tell her your fears. If she is firm that your mom and your dad are your biological mother and father, then it’s pretty easy to get everyone retested to make sure the blood types are what you think they are.
Added:
David Nandwa
My blood group is o positive and my wife is b negative. What precautions can we undertake to our unborn baby. She is 6 months pregnancy.
Added:
Velvet
My ex has your blood type, I have your wife’s.. Hopefully your dr. Has already given her a rogam shot so the babies blood is not fighting her blood.. I hope her pregnancy is going well..congratulations
Added:
Emmanuel Yeboah Dunga
if both parents are blood group O, then, under normal circumstances, all the children should have blood group O and no other group. But you can do the testing again if there is any doubt
Added:
Lori T.
Hi my mom said she is AB- and my dad is B+. I’m O-. I know my mom has the RH negative factor, which I have as well. Is it possible my dad is my dad?
Added:
Susan Knight
My parents are both A positve…I am B negative…is this possible?
Added:
Cheryl Greene
There is a small chance that two A+ parents could have a child who was Rh-, but two parents with type A blood can’t have a child with blood type B.
Before you jump to conclusions, it’s wise to have all three of you tested again to confirm your blood types. It’s not unusual for people to think they are one type when they are another.
Added:
Reynaldo
me and my wife are type O but my eldest son blood type is type AB. Is it Possible?
Added:
Tina
No, sorry to have to inform you, but its not possible. Maybe you all should be retested.
Added:
Namrata
My Blood Group Is A+ and My Husband blood group is O- Please let us know which blood group or children will have? Also please let us know what are the precaution we have to take during the pregnancy? And is there any problem in making baby if blood group is A+ and O-
Thanks & Regards,
Added:
mary
I am too trying to find this out.I am a pos,and ex is o neg,my daughter is o neg.
Added:
Cheryl Greene
There is a 25% chance that each child of an A+ parent and an O- parent will be O-. If you are concerned, DNA testing can give you specific information.
Best,
@MsGreene
Added:
Martin Luther
My Blood Group Is B+ and My Wife is B- Please let us know which blood group or children will have? Also please let us know what are the precaution we have to take during the pregnancy?
Thanks & Regards,
Martin Luther
Added:
vinit
My blood group is B positive & my wife has B negative…what is the possibilities of having baby…with blood group..can we have only one baby…or more???? Reply fast plzzz. It’s urgent! ***plzzz
Added:
sakshi sagar gaikwad
my blood group b negative & my husband blood group b positive whats complication pregancy please reply me fast
Added:
Nikhil
My blood group is B positive and my wife blood group is O positive; Is it possible that my baby have blood group O negative.
Added:
Michelle
Hi Dr, both my parents are O and I am A+. My mom had lots of blood transfusions before I was born. Is this possible?
Added:
Vivian
Hi Dr, I am O – and am looking to become a single parent with a sperm donor. Can you tell me what blood type to avoid please? Or if there are any complications with my blood type and any other blood type?
Added: