These factors help define the eight most common blood types: A positive, A negative, B positive, B negative, O positive, O ...

According to the American Red Cross, the most common blood type is O positive, which is the blood type for 37% of the population. The second most common blood type is A positive. There are over ...

Knowing your blood type is more important than you think. Here's why and tips for finding yours before an emergency happens.

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O blood groups are in particular demand because O positive is the most common blood type, and everyone can receive O negative blood in an emergency or if a person's blood type isn't known.