The human blood contains over 100 different antigens, therefore it would be time consuming and unpractical to test for every single one. Serologists instead use a number different blood testing techniques, but by far the most common and effective technique is the ABO system. This system is also used to determine compatibility for blood donors and recipients. The ABO blood type system involves checking the surface of the red blood cells for two antigens known as A and B, with blood type being named after the type of antigens it contains - A, B, AB and O.
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