Question: What is the most common blood type? Answer: The approximate distribution of blood types in the U.S. population is as follows:
O positive: 38 percent O negative: 7 percent A positive: 34 percent A negative: 6 percent B positive: 9 percent B negative: 2 percent AB positive: 3 percent AB negative: 1 percent
It's important to note that the blood type distribution may be different for specific racial and ethnic groups.
Special Note: The red cells in your blood can be A, B, AB, or O. The red blood cells also have a protein that is called Rh on the surface of the cell. Your blood can be Rh positive, which means that you have the Rh protein, or Rh negative, which means that you do not have the Rh protein. See More About Rh Negative Blood Type.
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with a health care professional should occur before applying
adjustments or treatments to the body, consuming medications
or nutritional supplements and before dieting, fasting or exercising.
None of these activities are herein presented as substitutes
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O positive: 38 percent 
*Consultation
with a health care professional should occur before applying
adjustments or treatments to the body, consuming medications
or nutritional supplements and before dieting, fasting or exercising.
None of these activities are herein presented as substitutes
for competent medical treatment.