Blood Types 102: The Role of A, B, O, and AB Groups In Determining Paternity

Hello Doc, Is there any way of determining the father of a child before it is born?
Jamaica

Bllod Types 102

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.

Dr. Alan Greene

Dr. Greene is the founder of DrGreene.com (cited by the AMA as “the pioneer physician Web site”), a practicing pediatrician, father of four, & author of Raising Baby Green & Feeding Baby Green. He appears frequently in the media including such venues as the The New York Times, the TODAY Show, Good Morning America, & the Dr. Oz Show.

  1. 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

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    • 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.

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  2. lacey

    Hi Im O+ and my Husband is A+ what is my daughters blood type

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    • 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.

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  3. Annie

    Im B+ and my baby is AB+, what tipe of blood is my husband, AB+? Thank you :)

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    • 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.

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  4. David...

    Hi i am ab- and my wife is a+ so what will our child be.

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    • 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.

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  5. Truleigh

    If one parent is AB- and one is A+ what is likely going to be child’s blood type?

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    • 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.

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  6. Kirsty Cooke

    Hi I am ab+ my mum is a resus – what is my dad?

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    • 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.

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  7. Amna Khan

    If mom has o+ and dad has b+, would child have b+? Or different blood type?

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    • 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.

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  8. Angel

    Can a ab+ and a ab- have ab positive baby ?

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    • 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.

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      • 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

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        • Rebecca

          Thank You

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        • 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.

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  9. Sophi

    If the mother is a+ and father is b+ can the. Child be o-

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    • 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.

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  10. Brandy

    I the mother am o- with a rh negative factor. My son is B+ would his father also be B+?

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    • 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.

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  11. 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

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    • Sherri,

      If your children are A- and your are O+ and if the father of your children has type AB blood, he could be AB- or AB+. Here’s why:

      Blood types are comprised of two alleles. The most common (by far) are A, B, and O. Each person also has Rh alleles that can be positive (+) or negative (-).

      If a person has O+ blood he or she has two O alleles (OO) and either two + alleles (+ +) or one + and one – (+ -).

      If a person is A-, he or she could have two A alleles (AA) or one A and one O allele (AO) and must have two – alleles (- -).

      If a person has type AB+ blood he or she has at one A allele and one B allele and either two + alleles (+ +) or one + and one – (+ -).

      If a person has type AB- blood he or she has one A allele and one B allele and two – alleles (- -).

      In the scenario you suggested, each child received an A from their father and an O from you. Each child also received a – allele from each parent.

      I hope that helps.

      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.

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  12. 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?

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    • 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.

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  13. 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

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    • 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.

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  14. Riz

    My blood type is O+ My husbands blood type is A+ and my daughters blood type is AB+ how is this possible?

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    • 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.

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  15. Carla

    My blood type is ab- and my sons blood type is a+ so what would my son’s fathers blood type be?

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    • 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.

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  16. 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?

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    • 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.

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  17. Cass

    Both my son and I are B+
    Are there any blood type that his father cannot be?

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    • 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.

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  18. Bky

    Please doctor, can 0 positive father has 0 negative child?

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    • 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.

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  19. Holly Moore

    Mom is o negative son is o negative so what would be the fathers blood type?

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    • 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.

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  20. Ejaye

    If a father is o negative and a mother is a negative can the child be A positive

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    • 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.

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  21. David

    If a mother is A+ and the father is B-, what can the child be?

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    • 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.

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      • David

        Thank you Dr. Greene!

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  22. Kimberly

    If a mother is A+ father is O+ can the child be AB+

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    • 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.

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  23. Tams

    daughter is ab mother is a+what can dad be

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    • 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.

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  24. Lori

    Is it possible for my mom to be AB+ and my father O. I am O.

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    • 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.

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  25. vinayasree

    Hi am vinayasree
    my moms blood group is o+and my dad’s is o- and I have b+ is this possible

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    • 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.

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  26. Shania

    My parents are B+ and O+ and I am A+. Is this possible?

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    • 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.

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  27. 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…

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  28. Yna

    If a mother is type B+ and the father is O+ it is possible the baby will b A+?

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    • 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.

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  29. Alex

    Is it possible to have a child blood type ab+ if a mother is a+ and the father is o+?

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    • 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.

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  30. 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.

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    • 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.

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  31. Ziyan

    My mother is A+ and my father is B+ is it possible that me and my brother can be O+?

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    • 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.

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      • Ziyan

        Thank you

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  32. Olivia

    My mom has A- and my dad has B+ blood types. Based on that, what could my blood type be?

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    • 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.

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  33. Anthony

    What blood types are needed for my kids not to have type O ?

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    • 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.

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  34. 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?

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    • 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.

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  35. 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.

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  36. Alex

    Can O types have kids

    Added:
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    • 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:
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    • Veronica

      I’m O+ and I can kids

      Added:
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  37. Kurdo

    my blood is A+ and my blood wife is A+ ..what the type is my child will build is possible or best ?

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    • 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:
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  38. 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:
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    • 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:
      Reply
  39. 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:
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    • 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:
      Reply
  40. 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:
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    • 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:
      Reply
  41. Tyler

    My mom is +A and dad +O what am I?

    Added:
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    • 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:
      Reply
  42. 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:
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    • 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:
      Reply
  43. Thea

    Iam 0- blood type and the father is 0. Our daughter is A.
    How could this be?

    Added:
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    • 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:
      Reply
  44. aju

    My wife blood group ab+
    I am o+ my baby boy b+
    This was corect?

    Added:
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    • 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:
      Reply
  45. dianne

    its posibble when my mother is blood type B and my father is blood type O but i am blood type A+?

    Added:
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    • 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:
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      • Manda

        Ok I’m A+ and the dad is B+
        Are son is O- is he the dad ?

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        • 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:
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  46. Huwetah

    Hi I do not know my bloodtyoe but my mom is ab+ and my dad is o- what is my blood type

    Added:
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    • 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:
      Reply
  47. 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:
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    • 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:
      Reply
  48. 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:
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    • 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:
      Reply
  49. Christy

    My mother is B+ and my father is O+. My brother is O+ as well but I’m O- is this possible?

    Added:
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    • 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:
      Reply
  50. 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:
    Reply
    • 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:
      Reply
  51. Robyn McCracken

    Can an O+ parent, and an O- parent make an A+ child?

    Added:
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    • 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:
      Reply
  52. Brittney

    If one of my parents are A- and he other is AB+, is it possible for me to be AB-?

    Added:
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    • 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:
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  53. 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:
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    • 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:
      Reply
  54. 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:
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    • 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:
      Reply
      • RAMESH

        if farhera blood group is B positive and morher also B Positive the blood group of the children will be

        Added:
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        • 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:
          Reply
      • denise

        Is it possible for to parents to be o- and have a child with b+

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        • 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:
          Reply
  55. Brittney

    Hello, my blood type is a+. What are the possibilities of my parents blood type.

    Added:
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    • 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:
      Reply
  56. T'Shawn Dennis

    Hello, my mothers O- and my father is supposedly AB+ what is the possible result

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    • 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:
      Reply
  57. 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:
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    • 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:
      Reply
  58. 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:
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    • 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:
      Reply
  59. 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:
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    • 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:
      Reply
  60. Krystal

    Hello. My blood type is A+ and my father’s is O+. What would my mom’s blood type be?

    Added:
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    • 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:
      Reply
  61. Faiz

    Hi doc,
    My blood is “A+” and my wife blood is “AB” Is it correct my son can’t “O” category?

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    • 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:
      Reply
  62. 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:
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    • 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:
      Reply
      • ellaine

        yes they are both type O. I already checked their medical records.

        Added:
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        • 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:
          Reply
  63. Vee

    My dad’s a O and im a B+ is it possible????

    Added:
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    • 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:
      Reply
      • 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

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  64. Susie Gresham

    Hi, Is it possible for a Rh- parent and a O positive parent to have a A positive child?

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    • 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:
      Reply
  65. 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:
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    • 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:
      Reply
      • 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:
        Reply
        • 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:
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  66. Job Murphy

    I’m AB+ and my girl friend is O+ and our baby girl is AB + is that possible?

    Added:
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    • 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:
      Reply
  67. 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:
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    • 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:
      Reply
  68. 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:
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    • 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

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  69. 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.

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    • 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.

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  70. Dhee

    Hi I’m wondering my blood type is B+ and i want to know what is my child possible blood type. Thank you

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    • 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.

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    • Dhee

      Hi again my two sisters are both A+ and I’m B+ does it means our parents blood types are AB+? Thank you

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      • 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.

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  71. Dina

    Hi docter,

    Im rh- and the father of my baby is 0+ what blood group could my baby be

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    • 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.

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  72. 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?

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    • 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.

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  73. 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.

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    • 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.

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  74. jessica

    hello. my dad is O- and my mum is O+. i’m guessing i’m an O. but what Rh am i?

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    • 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.

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  75. Alyssa White

    I’m O+ and my daughter is O+ so what could her father’s blood type be?

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    • 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.

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  76. 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

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    • Rachel,

      Blood types are comprised of two alleles for the “letter type” and two different alleles for the “Rh type”. Each person gets one letter allele and one Rh allele from each parent.

      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

      Each person also has two Rh alleles.
      Rh+ = two + alleles (+ +) OR one + and one – (+ -)
      Rh- = two Rh- alleles (- -)

      In the example you provide, one parent is O, but you don’t state if he is Rh+ or Rh-. If he is O+ he can only pass down an O allele. He if is Rh+ he can pass down either a + or a – allele. If he is Rh- he can only pass down a – allele.

      You state your mother is Rh-, so she could only pass down a – allele, but we don’t know what her letter type is. If she is A+ or A-, she could pass down the A, but only a negative allele.

      You don’t really have enough information to make a good case, but that’s one example of how it could have happened.

      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.

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      • Flavia

        I’m A POSITIVE with Rh negative and the baby came out o positive.. what blood type does his father has?

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        • 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.

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  77. 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

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    • 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.

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  78. Shelbyy Johnston

    I have O- and my spouse has A+ was curious on what the possible blood types for my children could be

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    • 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.

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  79. 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.

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    • 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.

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  80. 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.

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    • 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.

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  81. Linus

    Can both parents that have the same blood type A+ give birth to what group of a child?

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    • 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.

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  82. 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

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    • 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

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  83. 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?

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    • 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

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  84. 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.

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  85. carolnina

    the mother is AB and the father is O how come that the baby is type O and now has a sepsis

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    • 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

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  86. 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.

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    • 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

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  87. 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?

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    • 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

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  88. Hatton

    I am A+ n my ex is A+ but our daughter is O- does that mean he’s not her daddy?

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    • Hatton,

      Not necessarily.

      Blood types are determined by two alleles – one from each parent:
      1) People who have type A+ blood can either have two A alleles (AA) or one A and one O (AO). Both are called type A.
      2) People who are Rh+ can either have two + alleles (++) or one + and one – (+-).
      3) In your situation, both parents could be AO and each one passed down the O allele, so the baby is O.
      4) Each parent could also be +- and pass down the – allele, so the baby is Rh-.

      That also doesn’t proved your ex is the father. Simply that he could be. DNA paternity testing is the only way to be sure. It’s 99.999% accurate.

      Does that make sense?

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      • denise

        Is it possible that two parents have a child that is B possible

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  89. shamira

    Hi Doctor, I am A- and my husband is 0+ what could our child be?

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    • 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

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      • shamira

        Thank you

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  90. Merrith

    If I am RH 0- and my mom was a- what would my father be?

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    • 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

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  91. Sherry horwath

    Is it possible for a child to have AB positive if one parent is AB positive and the other is o positive?

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    • 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

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      • Mher Diosomito

        Hi my husband is o+ and me is ab what was the baby s blood type

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        • 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

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  92. 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

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  93. Margaret

    If im an b+ and my daughter is an a+ what would her dad be

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    • 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

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  94. 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

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    • 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

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  95. Clare

    Hi my blood type is b neg and daughter is 0 negative what is the fathers blood type please?

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    • 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

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  96. Debbie

    My blood type is AB Neg and my husband is O negative. What would my son be? A or B?

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    • Debbie,

      If one parent is AB- and the other is O-, each of their children could be A- or B-.

      Best,
      @MsGreene

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  97. Payal

    My blood group is AB+ and my husband’s O+. What are the possible blood group that my child may born with?

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    • 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

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  98. Priya

    My blood group is o positive and my husband blood group is AB negative my son bloody group ?

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    • 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

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  99. Alvaron Alexander

    I am A+ female and my significant other is B- male. Is it possible for us conceive and have a healthy child?

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    • 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

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  100. Shawntee

    I’m O+ and my daughter is A+. What would her dad’s blood type have to be to make her A+?

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    • Shawntee,

      If your blood type is O+ and your daughter’s is A+, her father would have to be A+ or A-.

      Best,
      @MsGreene

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    • Arthur Jones

      My daughter is A+ so I want to know what will I be.

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      • Arthur,

        Do you know your daughter’s mother’s blood type? Without knowing that, no blood types are eliminated.

        Best,
        @MsGreene

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  101. Jamie

    My blood type is O-. My daughter is B-. My son is O-.
    What would my husband be?

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    • 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

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  102. 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+

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    • Hi Jacky,

      Each person’s blood type is determined by two alleles for A, B or O and two alleles for Rh+ or Rh-. Each person get one blood type allele and one Rh allele from each parent.

      If a parent is O+, he or she has two O alleles (OO) and can have two + alleles (+ +) or one + and one – (+ -). That parent can only pass down an O, but can pass down either a + or a – allele to each child.

      If a parent is A-, he or she can have two A alleles (AA) or one A and one O (AO), but can only have two – negative alleles (- -). That parent can pass down an A or an O allele, and can only pass down a – allele to each child.

      In the example you outlined, The child with O- blood received O alleles from each parent, and – alleles from each parent.

      Does this make sense?

      Best,
      @MsGreene

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  103. norda

    if a mother is O neg and father is O pos can the daughter be A neg?

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    • 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

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  104. 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?

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    • 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

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      • 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?

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        • DB

          I had my blood tested, and the records were incorrect in 1970. I am O negative. Thank you Doctor

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          • 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

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        • 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

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        • 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!

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          • 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.

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  105. 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?

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  106. SHANOJ

    Sir
    My Blood Group AB+ and my Wife Blood group B+, My child what are the blood group.

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    • 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

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    • SHANOJ

      possible o+

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      • Shanoj,

        If both parents are O+, each of their children will be O+ or O-.

        Best,
        @MsGreene

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  107. Joy

    My blood group & my wife’s blood group is same.. Will it take any effect on our upcoming 1st children ??

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    • 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

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      • 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:
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        • 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.

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  108. Tony

    My partner is o negative i am o positive is these blood group compatible

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  109. 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?

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    • Tania,

      No, that is not how it works. Rh factor is determined by two alleles that are either – or +. A child gets one from each parent.

      If a person is called Rh- he or she has two negative (-) alleles.
      If a person is called Rh+, he or she either has two + alleles or one + and one -. That means a person who is RH+ can pass down a – allele. In other words, your husband could be Rh+ and pass down an – allele to your daughters, but not necessarily to your sons.

      Does that makes sense?

      @MsGreene

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      • Tania Rodgers

        Thank-you yes that makes sense.

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  110. 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?

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  111. 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…

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    • 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

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  112. 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.

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    • 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

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  113. Gf

    My blood type is A – and my wife’s is O+.. what would this make our daughters?

    Added:
    Reply
    • 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

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      • jdc

        i would like an explination

        Added:
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        • Dear JDC,

          You ask “My blood type is A – and my wife’s is O+. what would this make our daughters?”

          1) If a parent is A- he or she can have two A alleles (AA) or one A and one O (AO). If he is Rh-, he has two – (- -).
          2) If a parent is O+ he or she can has two O alleles (OO) and can have two + alleles (+ +), or one + and one negative (+ -).
          3) If the A- parent passes down an A allele and a – allele and the O+ parent passes down an O alleles and a + allele, their child will be AO+-, which we call A+.
          4) If the A- parent passes down an A allele and a – allele and the O+ parent passes down an O alleles and a – allele, their child will be AO- -, which we call A-.
          5) If the A- parent passes down an O alleles and a – and the O+ parent passes down an O and a +, their child will be OO+-, which we call O+.
          6) If the A- parent passes down an O alleles and a – and the O+ parent passes down an O and a -, their child will be OO- -, which we call O-.

          Does that make sense?

          Best,
          @MsGreene

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  114. Yeo

    My blood type is B+ and my wife is AB+.

    My child is B-

    Is it possible? What are the chances?

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    • 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

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  115. Jerricka

    My father is B+ and my mother is A+ but im O- and my sister is O+ how is that possible?

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    • 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

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      • 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?

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  116. 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:
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    • 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

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  117. 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

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    • 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

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  118. alison

    If I’m rhesus negative will my child be the same

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    • 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

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  119. 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:
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    • 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

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  120. 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:
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    • 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

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      • 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:
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        • 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:
          Reply
  121. Aria

    If the father is O- can the baby be O+

    Added:
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    • 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

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  122. Gozie

    I am B+ and my husband is A- and I just tested my son and he’s O+…
    is it possible?

    Added:
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    • 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

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      • 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-).

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        • Hi Gozie,

          Each person has two alleles that make up their blood type. The most common (by far) are A, B, and O. Also, each person has two Rh alleles. These are positive or negative.

          If a person is B+, he or she can be BB or BO and + + or + -.
          If a person is A-, he or she can be AA or AO and – -.
          If a person is O+, he or she has two O alleles, OO and can be + + or + -.

          In the scenario you purpose:
          If the mum is B+ (BO) she passed down an O allele and either + or – Rh.
          If the dad is A- (AO) he passed down an O allele and either + or – Rh.
          If the son is O+ he is OO and either + + (if he got + alleles from both parents) or + – (if he got one + allele from on parent and one – allele from the other.

          I hope that makes sense.
          @MsGreene
          If these two people have a child, the first could pass down either

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  123. Kerry

    Hi
    I’m rehues negative my mother is not would my father be the same as me
    Thanks kerry

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    • Hi Kerry,

      If a child is Rh-, his or her parents can still both be Rh+.

      Each person has two Rh alleles that are either + or -. A child gets one from each parent.

      We call someone Rh+ if they are + + or + –
      We call someone Rh- if they are – –

      Based on the above, both parents could be Rh+ (+ -) and each one pass down the Rh- so the child is – – or Rh-.

      Hope that helps,
      @MsGreene

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      • Kerry

        Hi so as my mother is not my dad has to be is that right

        Added:
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        • 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

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  124. Curious

    If a mother is a+ and baby is o+ what would the father be?

    Added:
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    • 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

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  125. Shell

    If Im blood type O+ and my daughter is A+ can her fathers blood type be A-

    Added:
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    • 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

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  126. 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?

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    • 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

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  127. Kelly

    Hi if my mum is A- and my dad is 0+ is it normal to have the baby with 0 blood?

    Added:
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    • Hi Kelly,

      Yes, this is normal.

      If you’d like an explanation, let me know.

      Best,
      @MsGreene

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  128. 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:
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    • 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

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  129. kool whip

    Can a 0+ and a 0- make an A- baby

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    • 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

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  130. John

    Hi, my bloode type is b+ and my wife is o. Is it possible if my daughter has bloodtype A?

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    • 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

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  131. Jessica

    If me and my son have the same blood type (a-) then does his dad have the same

    Added:
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    • 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

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  132. 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:
    Reply
    • 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

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  133. Angie Atkinson

    If mother is O+ and father is B- can the child have B+?

    Added:
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    • 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

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  134. 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:
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    • 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

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  135. 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:
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    • 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

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      • pavi

        If the mom had B+ blood group then is it correct ?

        Added:
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        • Pavi,

          No. If either parent is type O, the child can not be AB.

          Best,
          @MsGreene

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  136. Stephanie Granberry

    father is A+ , mother is B- , first child is O- and second is AB-, how is this possible. Thank you

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    • Dear Stephanie,

      Blood types are comprised of two alleles. The most common (by far) are A, B, and O. Each person also has either an Rh+ or Rh- allele.

      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 two Rh- alleles (- -).

      In the example you provide, if one parents is A+, he or she could be AA or AO, ++ or +-. He or she could each pass down an A or an O allele and a + or a – allele.

      If the other parents is B-, he or she could be BB or BO, and must be – -. He or she could each pass down an B or an O allele and a – allele.

      Each of their children could them be AB+, AB-, A+, A-, B+, B-, O+ or O-. You may have noticed, their an A+ father and a B- mother can have essentially any blood type child.

      I hope this is helpful.

      Best,
      @MsGreene
      Co-founder & Executive Producer DrGreene.com, Mom

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  137. Savannah

    Hi Doc , I have O positive blood and so does my fiance would our baby have + or -?

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    • 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

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  138. Michelle

    If I am O- and my son is O- what blood type would the dad have?

    Added:
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    • 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

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      Reply
  139. 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:
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    • 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

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  140. 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:
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    • 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

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  141. Kazz

    Hi if the mother is 0+ and the baby A+.. What type would the father have to be?

    Added:
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    • Kazz,

      If the mother is O+ and the baby is A+ the father would be A+ or A-.

      Best,
      @MsGreene

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      Reply
  142. Crystal

    Hello, I’m b- and the Father is O-.. What would be the blood type of our baby?

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    • 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

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  143. Granny

    If the mother and father both have O+ blood could they have a child with O- blood type????

    Added:
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    • 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

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  144. Beth

    Hello,if the mother is o+ and father is o+. Could they have a child with o-?

    Added:
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    • 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

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  145. 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:
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    • 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:
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      • 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?

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  146. 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:
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    • 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

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  147. 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:
    Reply
    • 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:
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      • 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:
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        • Paul Thomasson Tveit

          lol she is B negative.:P

          Added:
          Reply
          • Paul,

            Mystery solved!

            Thanks for letting us know.

            Best,
            @MsGreene

            Added:
        • Hi Paul,

          Are you sure all the blood types are correct?

          @MsGreene

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      • bribe queen

        Please I need clear explaination on if one parent is ab+ and other o+ their child B-Day.

        Added:
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        • Dear Bride,

          Blood types are made of two alleles for the A,B,O type and two for the Rh type. Children get one letter allele and one Rh allele from each parent.

          If one parent is O+, his or her alleles could look like this:
          O+ can be OO++ or OO+-

          If the other parent is AB+, his or her alleles could look like this:
          AB+ can be AB++ or AB–

          If the child is B-, his or her alleles could look like this:
          B- can be BB– or BO-

          That means:
          If the first parent is OO+- he or she can only pass down an O allele, but could pass down an Rh-
          If the second parent is AB+ he or she can pass down either A or B and either + or –
          Then the child received an O from parent one, a B from parent two, and Rh-s from both to be B-

          Does that make sense to you?

          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:
          Reply
  148. Heather

    My mom is o+ and my dad is a-, what would that make my blood type?

    Added:
    Reply
    • 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

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  149. 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:
    Reply
    • 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

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  150. 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 ?

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    • 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?

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  151. 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?

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  152. Joella

    Hello. So my dad is O- and my mom is A+ but I’m B+?? That isn’t possible is it?

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    • 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

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  153. Jennifer Flynn

    Is there a possilbity that O- male and a AB+ female have a A- child

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    • 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

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  154. Mohammad Rafiq

    If father and mother both has blood group A- then what would be there children’s blood group

    Added:
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    • 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

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  155. 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?

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    • 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

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  156. Katrina Nadminty

    Hello I am B+, my husband is O+ what blood type will my son be. Thank you

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    • 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

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  157. Kathy Lunt

    I’m A negative…neither my mother or father is A or negative..can this happen?

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    • 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

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      • 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:
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        • 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

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  158. Terboyen Zak

    Hello Dr, I am O+ and so is my wife can we have children?

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    • 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

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    • 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.

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  159. Abdul Razak

    Hi Dr, my wife and i belong to blood group O can we have children? Thank you.

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    • 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

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  160. Sue

    If mother is A- and father B- can baby be O+

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    • 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

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  161. martin

    if the mother was o-
    and her son is o- is it possible for daughter to be ab-?

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    • 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

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  162. 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

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    • 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

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      • 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

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        • 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

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  163. Bawi Kim

    Both my parents are AB blood type, what will be mine then?

    Added:
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    • Hi Bawi,

      If both parents are AB, their children can be A, B or AB, but not O.

      Best,
      @MsGreene

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  164. daris

    I have my blood group group A- and my father and mother have A+ can it be possible

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  165. Judy Ammons

    I am A- what would my father’s blood type be?

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    • 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

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    • Helen

      I’m o- what would my parents have to be?

      Added:
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      • 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

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        • Paul Thomasson Tveit

          this can’t be true.. my brother IS O- and our mother IS AB –

          I am O+, myself…?

          Added:
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          • Paul Thomasson Tveit

            lol Mom is B negative.:P

            I misremembered…I guess… memory is a fickle thing I guess.:P

            Added:
          • 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:
          • 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:
  166. 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?

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    • Helen,

      In this case, blood type alone can’t rule out either man.

      1. If the mother has O+ blood and the father has AB+ blood, it is possible to have a child with A+ blood.
      2. If the mother has O+ blood and the father has AB- blood, it is possible to have a child with A+ blood.

      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

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  167. Mimi

    Hello, please I’m O+ and my husband B+. Is it possible that our child could be AA or A+?

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    • 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

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  168. 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 +

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    • 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

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      • Honey

        Can Seema AB+ and her husband B+ have a baby with O+?

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        • 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

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  169. Asiog

    My blood type is O+ my parent’s are O+ and my sister is B+ how is that???

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    • 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

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  170. 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

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    • 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

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      • gabby

        thank you very much

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  171. Rebecca R

    Hi
    My father is o +
    My mother is A+

    I am resus A negative is this possible please
    Thank u

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    • Rebecca,

      Yes, this is possible.

      Let me know if you’d like an explanation.

      @MsGreene

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  172. 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:
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    • 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

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  173. Erika

    I am B positive my boyfriend is B positive why is my son B negative?

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    • Hi Erika,

      Each person has to Rh alleles. They are positive (+) and negative (-).

      We call a person Rh+ if they are two positive alleles ++ or one positive and one negative +-.

      Each parent passes down one allele to his or her child.

      In the case of two B+ parents and a B- child, both parents would be +- and each of them passed down the – allele so the baby is – – or Rh-.

      Does that make sense?
      @MsGreene

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  174. smile

    My dad is O- am B-(female), my two younger brother’s are A- and 0-…pls what could my mum blood group

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    • 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

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      • smile

        Ok…..
        So it means it z possible for a couple to av kids wif 3 different blood groups.

        Added:
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        • 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:
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  175. 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+

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    • 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

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  176. 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:
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    • 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

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  177. 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.

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    • Please send a link to the Redcross page where you saw this result.

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  178. 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:
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    • 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

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  179. Becky

    Hi if I am A Resus Negative blood is it possible to have both parents O positive

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    • 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

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  180. Jessica

    Dear Dr. If I am o positive and my husband is ab positive what blood type could our son be

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    • 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

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      • Ar anne

        Why AB is cant? And O?

        Added:
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        • Hi Jessica,

          Each parent passes down one allele. A, B, and O are the most common one by far. Each parent also passes down one Rh allele, either + or -.

          If one parent is AB+, that parent can pass down an A or a B. People who are RH+ can be ++ or + -, so that parent can pass down a + or a -.

          If the second parent is O+, that parent has two O alleles and can only pass down an O allele and can pass down a + or a -.

          The AB parent rules out the possibility of an O child. And the AB parent rules out the possibility of an AB child.

          Does that make sense?

          @MsGreene

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  181. 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:
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    • 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

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      • 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

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  182. Stela

    Me and my partner are o positive, and my child is a+ is that possible?

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    • 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

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  183. 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:
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    • 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

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  184. Lala

    Is it possible that my child is B+ and me and his father is O+? Is there any instances that already happened?

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    • Lala,

      I’m not aware of an instance where that has happened.

      Have you confirmed test results?

      @MsGreene

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  185. 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:
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    • Hi Andrea,

      It takes two alleles to make up a blood type and two to determine Rh factor. If you are O+ you have two Os (OO) and you are either Rh+ or Rh- so you can pass down an O and either a + or a -.

      If your daughter is A- she can be AA or AO and can only be – -. That means she would have gotten an A from her father, an O from you and a – from each of you.

      If the two are true, then her father is either A+ or A- and each of your children could be O+, O-, A+ or A-.

      Does that make sense?
      @MsGreene

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  186. 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.

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  187. 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:
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    • 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

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  188. anita

    Mother is 0- and father is 0+ and child is B+, is it possible?

    Added:
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    • 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

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  189. 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:
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    • 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

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  190. Angel perlas

    My both parents are type O but one of the siblings is type AB? Can it be possible?

    Added:
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    • 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

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  191. Pam

    If I am ABt can I have a parent AB t

    Added:
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    • 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

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  192. Dr:Kayla

    It’s Not normal if parents blood group is Orh+ but the child blood group is Orh-
    Dr:Kayla

    Added:
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    • Actually, is it normal. Here’s why —

      • Blood types are comprised of two alleles. Each is positive (+) or negative (-).
      • If a person is Rh- blood type, both alleles are negative.
      • If a person is RH+ blood type, he or she can have two positive alleles or one positive and one negative.
      • If both parents have one positive allele and one negative, and both pass down the negative allele, their child would have two negative alleles and be Rh-.

      Does that make sense to you?
      @MsGreene

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  193. James

    If a mother blood type is Orh+ and the father blood type is also Orh+
    But child was Orh- is it possible?

    Added:
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    • James,

      Yes, this is possible. If you’d like an explanation, let me know.

      Best,
      @MsGreene

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      Reply
  194. ashley Brumbaugh

    I am O + my baby is also o+ can her dad be a+

    Added:
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    • Ashley,

      Yes, that is a possible combination. In fact, that’s a common outcome.

      Best,
      @MsGreene

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      Reply
  195. Niki

    Hi I am O+ and my partner is AB- I wanted to know what precaution measures to be taken during pregnancy ??

    Added:
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      • Niki

        Thank u sir . I guess no incompatible issue

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  196. Mary

    If mother and father are both 0+ will baby be same

    Added:
    Reply
    • If both parents are O+, each of their children can be either O+ or O-.

      Best,
      @MsGreene

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      Reply
  197. 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:
    Reply
    • 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

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      Reply
  198. 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:
    Reply
    • If a child is AB+ and one parent is A-, the other parent is B+.

      Hope that helps,
      @MsGreene

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      Reply
  199. Anju

    I’m A+ and my husband is Ab- will there be any prblm wid the child??.

    Added:
    Reply
    • 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

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      Reply
  200. Lucy

    Hi Dr Green,
    Mum A-
    Dad A +
    What could the children be please?

    Added:
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    • 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

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      Reply
  201. 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:
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    • Hi Curious,

      In the RH system, each person has two alleles. Each can be either positive (+) or negative (-). If a person has two negatives, they are Rh-. If a person has one two positives or one positive and one negative, they are Rh+.

      In the example you give, one parent is A+ (and would be +-) and the other is B+ (and would be +-). If each parent passed down a negative allele, the child would be — or Rh-.

      Hope that explanation makes sense.

      Best,
      @MsGreene

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      • Curious Me

        Yes, it does. Thank you so much for taking the time :)

        Added:
        Reply
  202. jo

    If I’m o rhesus negative and my mums o positive what blood group should my dad be

    Added:
    Reply
    • 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

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      • jo

        Thanx you very much yes it has helped

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        Reply
  203. chantall

    Dear Dr Green. Can a O+ mother and an A- father have an O+ child

    Added:
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    • Chantall,

      Yes, an O+ mother and an A- father have an O+ child.

      If you’d like an explanation, let me know.

      Best,
      @MsGreene

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      Reply
  204. Raj

    Dad B+ and mother B+ but son is o+ it is possible

    Added:
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    • Raj,

      Yes, this is a possible outcome.

      Let me know if you’d like an explanation of how this works.

      Best,
      @MsGreene

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      Reply
  205. 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:
    Reply
    • 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

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      Reply
  206. Rob

    My blood is O+ and my wife is O – what will my child be?

    Added:
    Reply
    • 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

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      Reply
  207. Heila

    Hallo,
    Dad is O+ and mom is O-. Can the child be A+?

    Added:
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    • 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

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      • Heila

        Thank you

        Added:
        Reply
      • Reco

        Hi im o- and my wife is o+ can oir child be any other blood group

        Added:
        Reply
        • 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

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          Reply
  208. 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:
    Reply
    • 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

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      Reply
  209. Karen

    Is there a Dna test to discover if parents were really siblings?

    Added:
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    • 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

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  210. Kerry

    My blood type is A and my husbands’ is B. My baby has O … does this match with us?

    Added:
    Reply
    • 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

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      Reply
  211. Joy

    My father has B+, my mother has A+. I am a boy have AB-. Is it ok?

    Added:
    Reply
    • Yes, it is very normal for a B+ parent and an A+ parent to have an AB- child. No worries.

      Best,
      @MsGreene

      Added:
      Reply
  212. 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:
    Reply
    • 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

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      • Helen

        Can a o+ and ab+ make A+baby?

        Added:
        Reply
        • 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

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  213. Jane

    If both parents are B+ do all kids have to be B+or O+?

    Added:
    Reply
    • If both parents are B+, they can have children who are B+, B-, O+ or O-.

      Best,
      @MsGreene

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      Reply
  214. Terry

    Can Type B and O Positive have Rh O negative child??

    Added:
    Reply
    • 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:
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      • Love

        Pls I would like an explanation on this

        Added:
        Reply
        • Hi Love,

          Blood types are comprised of two alleles. The most common are A, B and O.

          People with type B blood can have two B alleles or one B and one O –> BB or BO.

          People with type O blood can only have two O alleles –> OO

          Similarly, people who are Rh+ can have two positive alleles or one positive and one negative allele –> ++ or +-

          People who are Rh- can only have two negative alleles –> – –

          In the example of one parent who is B+ and the other is O+, with an O- child, the each parent passed down an O allele and each parent passed down a negative allele.

          Does that make sense?

          @MsGreene

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  215. 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:
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    • 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 she has two – alleles). 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:
      Reply
  216. 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:
    Reply
    • 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:
      Reply
  217. Kylei

    Hi! If im type O positive and my husband is type AB positive, can we have a type O positive baby? Thanks

    Added:
    Reply
    • 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:
      Reply
      • 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:
        Reply
        • If both parents are O+ their children will be O+ or O-.

          @MsGreene

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  218. 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:
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    • 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:
      Reply
  219. 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:
    Reply
    • 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:
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  220. Lynn

    Is it possible for a O negative mother and A positive father to have a B positive baby

    Added:
    Reply
    • 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:
      Reply
  221. Bev

    Can an A possitve mother and O negative father have a Rh A negative baby ?

    Added:
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    • Hi Bev,

      Yes, it is possible for an A+ parent and an O- parent to have an A- child.

      In the A,B,O system each person has two alleles that make up their blood type. The A and B are dominant and the O is recessive.

      If a person is type A, he or she can be:
      AA
      AO (since O is recessive, the A is used for the blood type)
      If a person is type O, he or she can only be:
      OO

      Similarly each person has two alleles that make up the Rh system. Positive (+) is dominant and negative (-) is recessive.

      If a person is Rh+, he or she can be:
      + +
      + –
      If a person is Rh-, he or she can only be:
      – –

      In the example you give one parent is AA or AO and + + or + -. The parent can pass down A or O (but not both) and + or – (but not both. The other parent is O- so can only pass down O and -.

      If the A+ parent passes down A and – and the O- parent passes down O and -, their child would be AO – – or A-.

      Hope that’s clear,
      @MsGreene

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      • Mary

        Thanks for adding this to your initial overview. It is an excellent explanation of why I am O- and my daughter is O+.

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        Reply
  222. Ahmed

    If my mama is Ab and my baba is BA what’s my blood type? Please help its urgent

    Added:
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    • 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:
      Reply
  223. Cindy

    Can an A+ mom and an O- father have an A – child

    Added:
    Reply
    • 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:
      Reply
      • Cindy

        I would love an explanation

        Added:
        Reply
        • Hi Cindy,

          You asked: “Can an A+ mom and an O- father have an A – child”.

          In the A,B,O system each person has two alleles that make up their blood type. The A and B are dominant and the O is recessive.

          If a person is type A, he or she can be:
          AA
          AO (since O is recessive, the A is used for the blood type)
          If a person is type O, he or she can only be:
          OO

          Similarly each person has two alleles that make up the Rh system. Positive (+) is dominant and negative (-) is recessive.

          If a person is Rh+, he or she can be:
          + +
          + –
          If a person is Rh-, he or she can only be:
          – –

          In the example you give one parent is AA or AO and + + or + -. The parent can pass down A or O (but not both) and + or – (but not both. The other parent is O- so can only pass down O and -.

          If the A+ parent passes down A and – and the O- parent passes down O and -, their child would be AO – – or A-.

          Hope that’s clear,
          @MsGreene

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  224. Reynald

    If Im B+ and my wife is O rh + what type of blood my kids should be.

    Added:
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    • 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:
      Reply
  225. Sachin

    My blood group is B positive, my wife blood group is A positive.
    What is my child”s blood possibilities? Please, urgent

    Added:
    Reply
    • 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:
      Reply
  226. Sachin

    My blood group is B negative, my wife blood group is A positive.
    What is my child”s blood possibilities? Please, urgent

    Added:
    Reply
    • 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:
      Reply
  227. 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:
    Reply
    • 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

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      Reply
  228. 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:
    Reply
    • 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:
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  229. 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:
    Reply
    • 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:
      Reply
  230. 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?

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  231. Tushar

    father blood group Ab+ and mother blood group A+ then poosibale to child blood group O+????

    Added:
    Reply
    • 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:
      Reply
      • Tushar

        Father blood group B+ and mother blood group A+ then poosibale to child blood group O+??

        Added:
        Reply
        • 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

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  232. 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:
    Reply
    • Yes, this is possible.

      The Rh system uses positive (+) and negative (-) to name each of two alleles. Positive is dominant. Negative is recessive. A person with Rh+ blood can be either ++ or +-. A person with Rh- blood is – -.

      If both parents are +-, they can each pass down the – and their child will be – – or Rh-.

      Hope that helps,
      @MsGreene

      Added:
      Reply
      • PandiriRajanipandiri

        Thank you Mr Greene

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        Reply
  233. 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:
    Reply
    • 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:
      Reply
  234. Lisa

    I’m AB the neg. Partner is B positive why is my baby O neg

    Added:
    Reply
    • 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:
      Reply
  235. Mayur

    Father blood b+ mother blood o+ child blood B-

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    Reply
  236. Inge

    Can a O+ mother and a O+ father have a A+ baby? What is the chances that this could ever happen?

    Added:
    Reply
    • 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:
      Reply
  237. rafiq

    Is there ANY possibility that a B+ father and an O mother having a A+ child?

    Added:
    Reply
    • 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:
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  238. Prachi

    Mother blood group is A+ and father is having B+then how is possible ki my baby having o+

    Added:
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    • 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

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  239. 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:
    Reply
    • This is possible.

      People who are called Rh+ can have, and pass along an Rh- allele. If both parents do, the child would be Rh-.

      Added:
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  240. 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:
    Reply
    • If one parent is B+ and the child is B- the other parent could be:
      O+
      O-
      B+
      B-

      Hope that helps,
      @MsGreene

      Added:
      Reply
  241. 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:
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    • 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

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      • 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

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        • It could be either Rh positive or Rh negative.

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  242. 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.

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  243. 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?

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    • devi

      the baby can be rh positive or negetive.

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  244. 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

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    • 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

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  245. bill

    Can a female who is RH – and a male who is O+ have a child that is B+?

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    • 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

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      • 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

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        • Yes, if one parent is Rh- and the other is O+, they can have a child who is B+.

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  246. 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 .

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    • If one parent is B+ and the other parent is A- there are many options for their children’s blood type:

      • AB+
      • AB-
      • A+
      • A-
      • B+
      • B-
      • O+
      • O-

      Here is why:

      • Each parent provides one allele for blood type and one allele for Rh factor to each child.
      • Type A and B or dominant. Type O is recessive.
      • Rh+ is dominant and Rh- is recessive.
      • If a parent is B+ he or she can be BB++, BB+-, BO++ or BO+-
      • If a parent is A- he or she can be A– or AO–

      In this scenario:

      • Parent one can pass down a B or O and a + or a -.
      • Parent two can pass down an A or O and a -.

      Hope that is helpful,
      @MsGreene

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      • Varu Bhavesh s

        Thanks sir

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    • Varu Bhavesh s

      Dear sir give me reply .please

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  247. 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.

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    • Dear Unsure,

      I bit of background, just to be better able to understand how this all works — Blood type are made up of two alleles that are A, B, or O (there are other rare types, but we wont’ go into that here). A and B are dominant and O is recessive.

      The Rh system is made up of + and -. If a person has two + alleles or one + and one – (shown as ++ or +-) they are called Rh+. Two be Rh- a person must have two negative Rh alleles or –.

      Let me deconstruct your situation:
      1. You want to know if you are a full sibling to your two “sisters”.
      2. You don’t know their blood types.
      3. Your father was either O+ or type A+.
      4. Your mother was O-.
      5. Your blood type is A+.
      6. Your husband and your children’s blood types are irrelevant to your primary question, though the types are all very interesting and all fully explainable if you’d like to also discuss how those play out.

      From the above, here’s what we can learn:
      1. If you are A+ we know that you are either AA or AO and either ++ or +-.
      2. This means at least one of your parents had to be type A. The other could have been type A or type O.
      3. This also means that both your parents could not be Rh-, since they would have two negative alleles each to be Rh- and could then could only pass down a negative allele.
      4. But one parent could be Rh- as long as the other was Rh+. In that situation you would get one positive allele from the Rh+ parent making you Rh+ even if the other parent passed along an Rh- allele.

      Does this tell you anything about your siblings? Unfortunately no. But it does say that if you are A+ and your mother was O-, your father would have to be A+. So why did his discharge papers say he was O+? You may have noticed I didn’t assume any of the information you shared was fact because all too often tests are in error, or records are in error, or people’s memories are in error.

      Sorry I couldn’t be more helpful, but if you want to know more, it would be great to have your sister’s blood types.

      Best,
      @MsGreene

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  248. alvira

    was wondering if mother is o and father is ab can they have a child born with o type blood

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  249. 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.

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    • Sure this is possible. Blood types are comprised of two alleles for the type and two for the RH factor. A and B are dominant and O is recessive. Rh+ is dominant and Rh- is recessive. Here’s how it would look in this situation:

      –> Parent one is A+. That parent is either AA or AO and +- (but not ++, which is also called Rh+)
      –> Parent two is B-. That parent is either BO or BB and —
      –> Parent one passes A to both children, but passes Rh+ to one child and Rh- to the other.
      –> Parent two passes B to both children, but must pass Rh- to both children.
      –> The outcome, one child who is AB+ which is AB+- and is called AB+. The second child is AB– which is called AB-.

      Hope that makes sense.
      @MsGreene

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  250. vasu

    Blood groups &relation a,b,ad,o,da positive and negative blood group

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  251. 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.

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    • 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?

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  252. suhel

    father blood group B positive and mother A positive child should which blood group

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    • 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

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      • suhel

        thankx my baby b positive its ok

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  253. Sujit

    If I’m B+ and my wife is B+ can our child be AB+?

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    • 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

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  254. Roxy

    I am Negative RH (A) and my son is Positive A, what should the father’s blood type be?

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    • Roxy,

      If a person is negative Rh (or Rh-), he or she has two negative alleles or –. A person who is Rh+ could have two positive alleles ( ++ ) or one positive and one negative ( +- ). This is because positive is dominant and negative is recessive.

      For a child to be Rh-, he must have gotten a negative allele from both parents. His means his parents can be Rh- or Rh+.

      Additionally, an Rh- mother who has an Rh+ child needs to be concerned about subsequent pregnancies. Please see Dr. Greeene’s Q&A Blood Types 101: An Introduction to ABO Blood Types and the Rh System for the details.

      Best,
      @MsGreene
      Co-founder & Executive Producer, DrGreene.com

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  255. Roxy

    Hello, I am Negative Rh and my son is A Positive, what should his father blood type be?

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    • Roxy,

      If a person is negative Rh (or Rh-), he or she has two negative alleles or –. A person who is Rh+ could have two positive alleles ( ++ ) or one positive and one negative ( +- ). This is because positive is dominant and negative is recessive.

      For a child to be Rh-, he must have gotten a negative allele from both parents. His means his parents can be Rh- or Rh+.

      Additionally, an Rh- mother who has an Rh+ child needs to be concerned about subsequent pregnancies. Please see Dr. Greeene’s Q&A Blood Types 101: An Introduction to ABO Blood Types and the Rh System for the details.

      Best,
      @MsGreene
      Co-founder & Executive Producer, DrGreene.com

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  256. Marie

    Hello,

    Can an A+ mother and O- father have a baby that is O+?

    Thank you

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    • Hi Marie,

      Yes, it is possible for an A+ parent and a O- parent to have a baby that is O+.

      Here is why:
      — A person who is in the A blood group can have two A alleles (AA) or one A and one O (AO). This is because A is dominant and O is recessive.
      — A person who is in the O blood group can only have two O alleles (OO).
      — A person who is RH+ can have two positive alleles (++) or one positive and one negative (+-). This is because positive is dominant and negative is recessive.
      — A person who is Rh- must have two negative alleles (–).

      Here is how it works with one parent who is A+ and one who is O-:
      — The parent with who is type A, is AO and passes the O allele on to his or her child.
      — The parent who is O must pass on an O.
      — The parent who is Rh+ passes on a positve allele.
      — The parent who is Rh- must pass on a negative allele.

      The child would be OO+- which is known as O+.

      Hope that helps,
      @MsGreene
      Co-founder & Moderator, DrGreene.com

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      • Marie

        Thank you

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  257. Michelle

    Your last sentence is beautiful! Thank you :)

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  258. Debbie

    Can o+ and a+ make a baby a-

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    • Hi Debbie,

      The short answer is this is totally possible. Here’s the long answer:

      Blood types are comprised of two alleles. Each child gets an allele from each of his or her two parents. The most common alleles are A, B (both dominant) and O (recessive). There are a few other rare types, but not necessary for this answer.

      • A = AA or AO
      • O = OO

      If an A parent and an O parent have an A child, and the child gets the A from one parent and an O from the other. The child will be AO, which is known as A.

      Rh factors are + (which is dominant) or – (recessive).

      • Rh+ = + + or + –
      • Rh- = – –

      If two Rh+ parents who are + – (still called Rh+) have a child, the child can get a – from both parents and would be Rh-.

      Hope this makes sense.

      Best,
      @MsGreene

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  259. 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?

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    • Dear Anonymous,

      Lot’s of people wonder about this very thing — how can two parent who are Rh+ and an Rh- child?

      Everyone inherits Rh factor genetic information from both parents – one Rh allele from each parent. The two different alleles for the Rh factor are known as Rh+ and Rh-. Rh+ is dominant and Rh- is recessive. Someone who is “Rh+ has at least one Rh+ allele, but could have two. If someone is Rh-, both alleles are Rh-. Here’s how that looks:

      — Rh+ = + + or + –
      — Rh- = – –

      If two parents are Rh+ and it looks like this + -, each one could pass along the Rh- allele and their child could be Rh- (- – ).

      I hope this answers your question.

      Best,
      @MsGreene

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  260. Anyone

    Both parents are A+ and the child is O- is it possible?

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    • Dear Anyone,

      Blood types are comprised of two alleles, one from each parent. A and B are dominant and O is recessive. Rh factor is either + or -. Rh+ is dominant and Rh- is recessive.

      Blood type A can be AA or AO. Blood type O is always OO. If one parent is AO and the other is OO, then then they could have an O child.

      Rh- is always – –
      Rh+ can be +- or ++

      If both parents are +-, their blood types would be Rh+, but they could both pass the – on to their child and the child would be Rh-.

      In this way, it’s possible for two A+ parents to have an O- child.

      Hope that makes sense.
      @MsGreene
      Executive Producer, DrGreene.com
      Mother and Citizen Scientist

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    • Bismark Addo

      I and my wife are A+ but the child is O can it be possible

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      • Yes, this is possible. In fact, it is common.

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  261. 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

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    • 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

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  262. 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.

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  263. 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?

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    • 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?

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  264. 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?

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  265. 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.

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    • 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

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  266. 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?

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    • Bright

      Please my blood group is O+ and my wife has O+, please is it possible to have O+ child?

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      • Two O+ parents can have an O+ child or and O- child. O+ is far more likely.

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  267. MARISOL

    MY MOM IS AB+ AND MY FATHER IS O+, I’M O+ SO I’M IMPOSSIBLE CHILD?

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    • 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?

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  268. 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?

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  269. 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 ..

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  270. 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.

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  271. 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

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    • 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

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      • LorriA

        My mother is an A, my father B. I am an O. My siblings are A, B and AB.

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        • 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

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  272. AM

    Can a child be A-blood type if both the father and mother have O+ blood types?

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    • 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

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      • A. Matthews

        That is exactly what I thought also. Thanks for clearing this up for me and the child.

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  273. 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?

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  274. GOPAL

    DEAR SIR I AM 0+ AND MY WIFE ALSO O+ BUT CHILD ARE B + IS POSSIBLE PLEAS HELP ME

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    • 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

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    • zen

      I am also o and my wife is the same to me but my kid is b, is possible?

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      • zen

        Is there any possibility of getting wrong classifying while identifying the type of blood?

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        • 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

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  275. Kathleen Walters

    My father was type AB+ blood type the only one out of 4 siblings.
    How does that happen?

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    • 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

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  276. 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?

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    • Hi Nicole,

      Everyone has to alleles that make up blood type. Each parent passes one of theirs down to their child — one from mom and one from dad.

      If one parent has type A+ blood, that person has either A & A, or A & O. A is dominant and O is recessive, so with one A & one O the type is still A. If the other parent is O+, that person has two O alleles. That means each of their children will get an O allele.

      In your example, parent one is A+ and parent two is A+ — each of their children could be A or O type (O if they get the recessive gene from both parents).

      In your second example, parent one is A+ and the other parent is O+ — each of their children could be A or O type (O if they get the recessive gene from both parents).

      The only difference in the two examples is the likelihood of type O blood in the child, which is high if one parent is type O, but completely possible even if both parents are type A.

      Hope that helps,
      @MsGreene
      Co-founder and Executive Producer, DrGreene.com

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  277. Jane

    I’m rheses negative B my daughter is A+ what blood group does that make her dad

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  278. bunny

    I am B+ and my wife is O+. I had a son of A+. Whether is it possible?

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  279. 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.

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    • 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

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  280. 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?

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    • “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

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  281. shreeprasad

    if father and mother are of B+and O+ respectively what will be blood group of child?

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    • 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

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  282. 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

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    • 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

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    • Crystal

      That would be no. I think your wife has some explaining to do. I’m sorry!

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  283. OPHINTA

    CAN A O BLOOD TYPE GET PRENANCY FROM SOMEONE WHO HAVE B

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  284. 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?

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  285. 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

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    • 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. The A and B alleles are dominant and O in recessive.

      — 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

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  286. Kadas

    My baby is B negative and im B positive his dad AB positive can this be right is this his father

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    • 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

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  287. 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??

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  288. 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.

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    • 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

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  289. Esther

    Hi Dr.
    My husband is B positive and I am O positive. I hope there won’t be problem in having a issue.

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    • 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

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  290. 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…

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    • 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

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      • 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

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        • 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+

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  291. 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

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    • 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

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  292. 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.

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    • 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:

      People are called Rh-negative if they do not have the rhesus (Rh) protein on the surfaces of their blood cells. If Rh-positive blood cells get into the bloodstream of someone who is Rh-negative, the body of that Rh-negative person will see this as an enemy invasion.

      Unprepared, the Rh-negative person will begin to make antibodies (what you call anticorps) against the foreign Rh protein. This first exposure is often not even noticed. The next time an exposure occurs, though, the body is primed to seek and destroy all Rh-positive blood cells. All-out war can occur inside an Rh-negative person’s body.

      A terrible condition called hydrops fetalis can be the result of that war. Rh incompatibility produces a wide variety of outcomes. Sometimes only mild anemia and perhaps a little jaundice are the only signs there has been a conflict.

      But sometimes the results are catastrophic. The first pregnancy is rarely a problem because blood is often not exchanged until the time of birth. But with each subsequent pregnancy, the risk for hydrops increases.

      This is important for you to discuss with your doctors, but there is a treatment.

      By giving anti-D globulin (RhoGAM) to Rh-negative moms during and shortly after each pregnancy (including after miscarriages and abortions), 99% of mothers will not develop anti-Rh antibodies.2 Unfortunately, about 1% still do.

      I hope this is helpful,
      @MsGreene

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  293. 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?

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    • 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

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  294. 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?

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  295. 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+

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  296. Brett Muney

    Both kids are o+ and wife is o+. What am I(dad)?

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    • 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

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  297. Lyndale Acena

    Hi, i want to ask if its possible if my baby got type B ? Me and my bf is Type O

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  298. rajeshkashid

    when the parents having same blood group then there is possibility to born the baby

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  299. 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.

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    • 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.

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      • Liza

        I’m aa and my husband’s o what would our child have for blood type?

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        • 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

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  300. KOUSTAV

    i am 0(-) blood group,my wife has 0(+), can baby possible at this situation???? plz,sir!!! we are tensed.

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    • 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

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  301. DEVANK

    Can a child have blood group B negative when his father have O positive and mother have B positive. Plz reply.

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    • Yes, this is possible. There is a 75% chance of being type B and a 6.25% chance of being Rg negative.

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  302. sohel rana

    I m AB+ and my wife is B+ is there any effect of my baby or any problems for my baby life

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  303. swetha

    Mine would be o+ and my husband is B- wht would be child birth then can i know…..

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    • 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

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  304. jhon

    my blood 0+and my wife a- what posibale baby and chance plz tel me

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    • 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

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  305. jhon

    hi i am male my blood 0+ and female a- what baby save or no tell me pleace

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    • 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 :)

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  306. 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.

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    • Lyndale Acena

      I ask the same question, my baby is type B. But me and my bf is type O

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  307. 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.

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    • 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.

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    • 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

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  308. kumara

    mother and father O+ and son also O+. is there any effect of my baby son?

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  309. 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

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    • 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

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  310. Bilinda

    Hi .. My recently born niece is B positive and her mom and dad are of same blood group A positive. Is it possible?

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  311. jay ar

    hi doc! is it possible for blood type O for women and blood type A for men to have a baby?

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  312. jay ar

    hi doc ..my girlfriend blood Type is O and mine is A..is this possible blood type match for a baby?

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  313. Nina

    Both of my parents have blood type O, and I as their daughter is blood type AB. Is it possible?

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    • In genetics, the blood type gene has two alleles. Each of the two allele has genotype A, B or O. The O is recessive and the A and B are dominant. We call blood types by their dominant allele name, if there is a dominant and a recessive allele. Here are the possible combinations and what they are named.
      – If allele A is combined with allele O, the person has type A blood.
      – If allele A is combined with allele A, the person has type A blood.
      – If allele B is combined with allele O, the person has type B blood.
      – If allele B is combined with allele B, the person has type B blood.
      – If allele O is combined with allele O, the person has type O blood.
      – If allele A is combined with allele B, the person has type AB blood.

      Each parent provides one allele to the child — half of the blood type comes from mom and half from dad. To have the blood type AB, you would need to get the A from one parent and the B from the other. If both mom and dad are type O, that means they both have two O alleles and can only pass down O alleles.

      Before you jump to any conclusions, do consider the possibilities — tests can be in error, memories can be wrong. The best thing to do is talk to your parents.

      Hope that helps,
      @MsGreene

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  314. 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

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    • In genetics, the blood type gene has two alleles. Each of the two allele has genotype A, B or O. The O is recessive and the A and B are dominant. We call blood types by their dominant allele name, if there is a dominant and a recessive allele. Here are the possible combinations and what they are named.

      – If allele A is combined with allele O, the person has type A blood.
      – If allele A is combined with allele A, the person has type A blood.
      – If allele B is combined with allele O, the person has type B blood.
      – If allele B is combined with allele B, the person has type B blood.
      – If allele O is combined with allele O, the person has type O blood.
      – If allele A is combined with allele B, the person has type AB blood.

      Each parent provides one allele to the child — half of the blood type comes from mom and half from dad. To have the blood type A, your brothers would need to get the A from one parent. If both mom and dad are type O, that means they both have two O alleles and can only pass down O alleles.

      Before you jump to conclusions, keep in mind there are many possible explanations. Talk to your mother. Consider re-testing everyone in the family if she doesn’t have information for you. And possibly consider dropping it. If your brothers aren’t concerned, it may be best to leave it alone.

      Hope that helps,
      @MsGreene

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      • stephen sekyi

        please doctor i am AS- and my girlfriend is O+what possible child are going to have please i need answer.

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    • D.latha

      Oh my god mind blowing… I can’t believing….ohh my god

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    • D.latha

      Hi doctor,
      Is it possible to children having parents either mother or fAther blood group…

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  315. 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?

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  316. Isaac

    Can we have a child with blood group O- if I am A+ and my wife is A- ?

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    • 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

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  317. Joyce

    I have o+ and my husband is b+ is it possible for our child to be o-?

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    • 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

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  318. 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?

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  319. DebJani Mallick

    Hey dr. I wnt to know: if father is B+ and mother’s blood group is O-. Can they have kids?

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  320. sue

    Both my parents and 6 siblings have A pos im O rh D neg is this possible

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  321. 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 ?

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  322. 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!!

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