What's the Most Common Blood Type? by Fred Cicetti | July 13, 2012 Among people in the U.S., it's type O-positive. The approx distribution of blood types in the U.S. population is: O-positive: 38% O-negative: 7% A-positive: 34% A-neg: 6% B-positive: 9% AB-positive: 3% AB-neg: 1% Blood type distribution may b different for specific racial & ethnic groups. Type O-negative blood is called the universal donor type b/C it is compatible w/ any blood type.
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