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Blood transfusion

Blood transfusion, transfer of blood or components of blood from one person or animal to another. Transfusions are used to replace blood loss due to hemorrhaging, severe burns, or shock, and in such disorders as hemophilia. They are also used regularly in surgical procedures. Blood must be tested for compatible classification (blood group and Rh factor) to prevent rejection reactions by the recipient. Plasma, the fluid part of blood, is often given when whole blood is not needed or is unavailable.

See also: Blood; Plasma.

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