Before a person can receive a blood transfusion, medical professionals must assess the quality and safety of the donated blood. Donated blood is always whole blood, which is then separated into blood components such as red, white, and platelet cells. An anticoagulant is added to keep the blood in its liquid form. Donated blood is tested and traced to ensure no viruses, bacteria, or other harmful particles are present. The blood is tested for blood type and RH factor so that the donor receives the type that matches their own blood.

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