A member asked:

Can you tell me how many blood types are there?

A doctor has provided 1 answer
Dr. John Munshower answered

Specializes in Family Medicine

4: There are 4 different blood types (a, b, o, & ab). Each blood type can either be rh positive or rh negative. (e.g., a+, a-, b+, b-, o+, o-, ab+, ab-).

Answered 5/8/2013

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