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A 17-year-old female asked:

A mother has a as her blood type and her husband is o. but their daughter's blood type is b. is that possible?

2 doctor answers7 doctors weighed in
Dr. Bryan Levey
Pediatrics 27 years experience
Clearly yes....: ....It's possible for the baby to be b. But the husband isn't the father. This assumes that you have all the blood types right. Before you stir any pots, i would make very, very sure that the mother and her husband are the blood types you think they are. If mom is actually a or ab, or dad is b, then he could be the father. The baby has to get the b type from someone.
Dr. Ed Friedlander
Pathology 44 years experience
Unlikely: The husband may still be the father if the "B" that the daughter has is a weak "B" unexpressed for whatever reason in the parent. Or the husband may have the bombay phenotype and be unable to express his "B". Or there is a lab error. Or this is indeed non-paternity.

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Last updated Aug 20, 2015

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