Transfer of blood taken from one person into the circulation of another to restore blood volume, increase hemoglobin levels, or combat shock. Once the blood-group antigens and antibodies (see ABO blood-group system, Rh blood-group system) were discovered, blood typing of donors and recipients rendered transfusion safe. In exchange transfusion, all or most of the blood is removed and replaced with another's blood. Undesirable reactions to transfusion are not uncommon.
Learn more about blood transfusion with a free trial on Britannica.com.
Transfusion practices among patients who did and did not predonate autologous blood before elective cardiac surgery
Apr 06, 1999; Abstract Background: Preoperative autologous blood donation is commonly used to reduce exposure to allogeneic transfusions...