The ABO and Rah groups are used to categorize blood stored in blood banks. If you are type a negative, you can receive type a negative blood from the bank. However, even though the groups match, a small sample of each unit (a unit of blood is the equivalent of about one point) of blood to be used in transfusion is still tested with a small sample of your blood to be used in transfusion is still tested with a small sample of your blood to guard against the very small possibility that a harmful reaction might occur. The two samples_ one form your blood and one form the donor blood are mixed, than observed under a microscope. A technician looks at the mixture to make sure no antibodies form in your blood that would damage the donor blood is mixed, than observed under a microscope. A technician looks at the mixture to make damage the donor blood. This test, called cross-matching, can be done in under an hour. If you are losing blood very rapidly and can’t wait for the results, you may receive blood 0 Rh-negative, known as the “universal donor.” In older people and people who are severely anemic, transfusion of whole blood can overload the circulation and cause heart failure. For this reason, a diuretic a drug that causes the body to lose fluid is usually given to people.
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