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What is the purpose of blood transfusions?

Blood transfusions are used to replace lost or deficient blood components in order to restore normal body function. They may be needed after severe bleeding from injury or surgery or to treat conditions such as anemia, clotting disorders, or certain cancers. Depending on the patient’s needs, transfusions can provide red blood cells to improve oxygen transport, platelets to help blood clot, or plasma to replace important proteins and clotting factors.