A member asked:

How many different blood types are there?

A doctor has provided 1 answer
Dr. William Harris answered

Specializes in Family Medicine

Many: A+, a-, b+, b-, ab+, ab-, o+, o-. If you are getting a blood transfusion, there are many other factors to take into consideration. Kell, lewis, and other factors have to be matched so that there won't be a reaction. Without a perfect match, you may have a big problem in a transfusion situation.

Answered 3/16/2013

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