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A 47-year-old member asked:

is it possible for an a negative blood father and a b positive mother to have an o negative child?

1 doctor answer2 doctors weighed in
Dr. Donald Alves
Emergency Medicine 24 years experience
Yes: There are two "positions" in the blood type (like ab blood), if father ao and mother bo, then could see a, b, ab, or o as blood type. Rh factor is either transmitted or not--so mom might not transmit. Seek dna testing if want to know for sure.

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Last updated Feb 1, 2013

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