Dosing Spoon Surprise

Once again, my take is different than that of most. About 70 percent of Americans measure their liquid medicines in kitchen spoons. But when smart college students were asked to pour a real teaspoon of liquid medicine into a kitchen spoon, they averaged either eight percent less or twelve percent more than the amount prescribed, depending on which kitchen spoon they used, according to a report in the January 5, 2010 Annals of Internal Medicine. This happened in a well-lit room, in the middle of the day, after having been shown the correct amount. Imagine how far off an exhausted parent might be in the middle of the night, distracted by a crying baby.

The obvious response to this data? Always use a dosing cup or dosing spoon instead of a kitchen spoon. One dose may not matter too much, but repeated several times it could quickly add up to danger or to an ineffective medicine.

My response?

  1. When possible, choose medications where there is not a tight window between what works and what is dangerous. Cough syrup in children is one great example of this. A controlled study compared a DM cough syrup versus buckwheat honey. Children aged 2 to 5 years received ½ tsp, aged 6 to 11 years received 1 teaspoon, and 12 to 18 years received 2 teaspoons.  The honey worked better - at reducing the number of coughs, the severity of coughs, and the bother of coughs, and at increasing sleep for the children (and for the parents). Too much DM can cause diabetes, hallucinations, psychosis - even death. Too much honey? Not a big deal. 
  2. When the dose matters, don't trust yourself to estimate accurately. Choose a dosing spoon, dropper or syringe. Acetaminophen is one place where correct dosing really matters. It's easy to give too much. (And remember - fever is a friend - and kids often get better faster treating a fever only when it interferes with sleep or keeping down fluids).
  3. Choose smaller spoons and plates for food and tall, slim cups for drinks. Overdosing food in children is an even bigger health problem in the US than overdosing medicines. Container size matters: In this experiment, those using the larger spoon poured 20 percent more liquid, even though they were confident they had poured the same amount. Container shape matters: The same authors found previously that even confident veteran bartenders pour 28 percent more alcohol into short, wide glasses than into tall, slender ones of exactly the same volume. Use smaller plates when you want your child to be happy eating less; use larger plates and bigger, wider cups when you want your child to automatically eat and drink more.

Wansink, B. and van Ittersum. K. "Spoons Systematically Bias Dosing of Liquid Medicine." Annals of Internal Medicine, 5 Jan 2010, 152(1):66-67.

Paul, I.M., Beiler, J., McMonagle, A., Shaffer, M.L., Duda, L., and Berlin, C.M. “Effect of Honey, Dextromethorphan, and No Treatment on Nocturnal Cough and Sleep Quality for Coughing Children and their Parents.” Archives of Pediatrics & Adolescent Medicine, 2007, 161(12):1140-1146.

Wansink, B. and van Ittersum, K. “Shape of glass and amount of alcohol poured: comparative study of effect of practice and concentration.”  BMJ, 2005, 331:1512-4.

Fisher, J.O., Rolls, R.J., and Birch L.L. “Children’s Bite Size and Intake of an Entrée Are Greater with Large Portions Than with Age-Appropriate or Self-Selected Portions.” American Journal of Clinical Nutrition, 2003, 77(5):1164-1170. [Discussed in Feeding Baby Green]

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Comments

Anonymous's picture

Julie, thanks for the great

Julie, thanks for the great comment. You are so right. Just because you are giving a brand you are familiar with (such as Tylenol), don't assume you know the right dose unless you are sure which kind you are giving.
Anonymous's picture

Not only is the accuracy of

Not only is the accuracy of the dose important, but also the formulation or concentration of the medication. Tylenol is the perfect example. I've seen young children who have received a given dose of the infant Tylenol drops (100mg/mL) instead of the children's Tylenol liquid (32mg/mL). This can easily result in an overdose with a three-fold difference in the amount of Tylenol given. Make sure and ask which formulation to use!
Anonymous's picture

Our silverware drawer held

Our silverware drawer held our well-worn test-tube-y scoopy-ended vial thingy (I have no idea what it's called! I was just a kid!) that delivered "the pink stuff," the antibiotic of choice when I was a kid. It was plastic and pretty beat up, as I recall, and I remember the feel of the lip on my teeth. Over Christmas, I watched my poor little nephew with his big bad case of strep throat take his pink stuff with the exact same type of measurer. It's wonderful to know that my mom and my sister were doing the right thing by using a device that could accurately measure the dosage.
Anonymous's picture

Dawn, that's the way I grew

Dawn, that's the way I grew up too. And you're so right about multiple kids and medicines! I think the optical triggers of container shape and size are fascinating. In a small spoon we pretty reliably pour too little and in a large spoon too much -- even when we know the size and are trying to be accurate. The optical illusions and psychological triggers are so strong. My parents gave us a beautiful set of small plates for Christmas -- and we love them. I've found that the same serving size feels much more filling to me when it fills more of the plate. I'm no longer hungry sooner. This is consistent with a lot of research. For instance, when you ask adults to eat popcorn until satisfied, the amount they eat depends on the size of the container offered. Feeling satisfied eating less is pretty cool. (And LOL, Cheryl -- you're already a perfect height!)
Anonymous's picture

I remember my mom and dad

I remember my mom and dad always using kitchen teaspoons to give medicine. Sometimes we gave ourselves medicine using those spoons too! But since I have had kids I've always used the provided measuring dropper/ spoon or syringe. When you are tired it is easy to make a mistake, especially if you have multiple kids and medicines.
Anonymous's picture

If tall slim cups will help

If tall slim cups will help make me slimmer, I'm switching! Can they make me taller, too?