ANSWER

O positive is the most common blood type

Not all ethnic groups have the same mix of these blood types. Hispanic people, for example, have a relatively high number of O's, while Asian people have a relatively high number of B's. The mix of the different blood types in the U.S. population is:

Blood Donor
1* - Caucasian | 2* - African- American | 3* - Latino- American | 4* - Asian
1* 2* 3* 4*
O + 37% 47% 53% 39%
O - 8% 4% 4% 1%
A + 33% 24% 29% 27%
A - 7% 2% 2% 0.5%
B + 9% 18% 9% 25%
B - 2% 1% 1% 0.4%
AB + 3% 4% 2% 7%
AB - 1% 0.3% 0.2% 0.1%

Some patients require a closer blood match than that provided by the ABO positive/negative blood typing. For example...

Read more at:
American Red Cross

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