but The membrane of human blood cells contain a variety of blood group antigens which are also called agglutinogens.The most important &bast known of these are A&B antigen but there are many more.
There are 4 main blood groups A,B,AB&O.Type A individual develops Anti B antibodies,Type O individuals develops both and Type AB individual develops neither.When the plasma of A type individual is mixed with type B red cell,The anti B antibodies causes the type B red cell to clump.
Blood typing is performed by mixing an individual's RBC with anti sera & seeing whether agglutination occurs.
Blood transfusion are frequently carried out in hospital wards but we should never give blood to the patient who has agglutinins against the agglutinogen of the doner.To make sure that the blood of patient doesn't cause agglutination a cross match must be done before transfusion
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