Negative blood types:

Only 18% of people in the U.S. have a negative blood type. Yet, when someone with a negative blood type needs blood, only another person with a negative type can save his or her life.

O-negative is the universal blood type. This means anyone can receive O-negative blood.  It is needed in trauma accidents when life-saving blood is required immediately, before blood type is identified. However, people with O-negative blood can only receive O-negative blood.

Can I donate?

Visit our FAQ page for answers to some common questions about blood donation eligibility.

U.S. Blood Donor Population by blood type:

O Rh-positive—39 percent
O Rh-negative—9 percent
A Rh-positive—31 percent
A Rh-negative—6 percent
B Rh-positive—9 percent
B Rh-negative—2 percent
AB Rh-positive—3 percent
AB Rh-negative—1 percent


Just Your Type!

What will your baby’s blood type be? Parents may be surprised to find their baby’s blood type is not the same as either of them.

Health Risks by blood type:

Many scientific studies have found a connection between blood types and health risks.  For instance, studies have found that people with Type O blood were at less risk of heart disease than any other blood group.

See below for connections found in other studies as well as the percentage of the U.S. population with each type. For more information, click on the links provided.



Blood type by race/ethnicity:

O-positive is the most common blood type. Blood types vary by ethnic group. More Hispanic people, for example, have O blood type, while Asian people are more likely to be type B. 

Some patients require a closer blood match than that provided by ABO positive/negative blood typing. For example, the risk of a reaction to transfused blood can sometimes be reduced if a patient receives blood that is from a donor with the same ethnicity. That’s why African-American donors may be the best hope for patients with sickle cell disease, 98 percent of whom are of African-American descent.

Bob Grant