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During a blood transfusion, a person (the recipient) receives healthy blood from another person (the donor). The donated blood is carefully screened for diseases before it is used. Before receiving a blood transfusion, the recipient's blood is analyzed closely (using blood type) to make sure the donor blood is a close match to the recipient's.
Blood is transfused into an arm vein slowly over 1 to 4 hours (except in an emergency when blood is transfused more quickly).
Blood transfusions can:
Blood transfusions aren't usually used to treat uncomplicated painful events or mild to moderate anemia.