Do You Need to Know Your Blood Type?

blood type ABO test The ABO test shows that people have one of four blood types: A, B, AB, or O If your red blood cells have: Blood received in a transfusion must have

Takeaway The ABO system is the best known way of classifying blood types In this system, there are eight main types O positive is the most common, and AB blood type Often abbreviated ABO, blood types are inherited and fall into four groups or types: O, A, B, AB Each blood type also is identified as either Rh positive or