Most important system of classification of blood types. Kind and presence of 2 different antigens on the surface of the erythrocyte membrane determines 4 blood types: A, B, AB and O. Type A has antigen A on the erythrocyte surface and has anti-B antibodies in the serum; type B has antigen B on the blood cell surface and has anti-A antibodies in the serum, type AB has both A and B antigens on the erythrocyte membrane but it doesn't produce antibodies in serum, while type O doesn't have antigens on the erythrocyte surface, but it produces both anti-A and anti-B antibodies in the serum. Blood types are important for transplantation. Type A can receive blood type A or O; type B - blood type B and O, type AB can receive all blood types: A, B, AB or O, while type O can receive only O type.

ABO BLOOD GROUP SYSTEM: "The ABO blood group system provides safe blood transfusion. "

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