Definition
By Mayo Clinic staffIn a blood transfusion, donated blood is added to your own blood. A blood transfusion may also be done to supplement various components of your blood with donated blood products. Sometimes a blood transfusion is done with blood that you've donated ahead of time before you undergo surgery.
During a typical blood transfusion, whole blood or certain parts of blood are infused through an intravenous (IV) line and needle that's placed in one of the veins in your arm. A blood transfusion usually takes one to two hours, though in an emergency it can be done much faster.
A blood transfusion boosts blood levels that are low, either because your body isn't making enough or because blood has been lost during surgery, injury or disease.
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