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Biology/Blood Typing


Im a little confused.

My father is type AB- and my mother is A+. I just donated blood and called Red Cross to get the type result, and they told me I was O-. Is this even possible? The guy at Red Cross said that most people dont believe its possible, but that it is. It seems like it isnt. Help!

Hi Meghan,

Thanks for the question!  If your parent's blood types are accurate, then it seems that the person who told you your blood type is O- was misinformed.  Here is a great link which explains blood typing and the possible combinations based on known blood types:

Hope this helps!



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Chris Larsen


I can answer questions relating to general biology, cell biology, human physiology, biochemistry and pharmacology.


Over 10 years working in the health care industry.

B.A. Biology, B.S. Nursing, Graduate studies in cellular & molecular physiology and pharmacology

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