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How do you know your blood type?

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Quick Answer

The easiest way to determine a person's blood type is to perform a blood test that checks for certain blood markers called antigens, according to WebMD. The test checks for two markers: ABO and Rh. The ABO test determines if the blood is type A, B, AB or O.

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Full Answer

The Rh factor can be negative or positive, meaning there are eight possible blood types, according to the American Red Cross. Type O is the most common blood type followed by A and B. Type AB is the rarest type and accounts for approximately 1 percent of the population, according to the American Red Cross.

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