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Importance of Type O Different ethnic and racial groups also have different frequency of the main blood types in their populations. For example, approximately 45 percent of Caucasians are type O, but 51 percent of African-Americans and 57 percent of Hispanics are type O. Type O is routinely in short supply and in high demand by hospitals — both because it is the most common blood type and because type O negative blood, in particular, is the universal type needed for emergency transfusions.

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The main reasons to know your blood group are if you need to have a blood transfusion or if you are pregnant. What is a blood group? Red blood cells erythrocytes have certain proteins on their surface, called antigens. Also, your plasma contains antibodies which will attack certain antigens if they are present. ABO and rhesus are both types of antigens found on the surface of red blood cells. There are lots of other types but these are the most important.

ABO blood types These were the first type discovered.