Blood group test. Technician using a pipette to mix antibodies with samples of blood to test their blood groups. The blood has been donated, and the antibodies will test for the presence of antigens on its red blood cells. The antibodies will react with certain antigens, making the red blood cells stick together (agglutinate). Blood is grouped by the antigens it has. The major blood groups are A, B, AB and O. Blood is further classified as Rhesus (Rh) positive or negative. The group is identified to prevent potentially fatal immune reactions in the patient receiving the blood. Antibodies are proteins that are part of the body's immune system.
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