All people do not have the same blood. It was only recently discovered, and until then, the blood, in emergency was given by immediate transfusion regardless of the so-called blood type. This is why half of the patients were worse and many of them died. To determine the blood groups, are needed the red blood cells of the donor and recipient's blood serum. Serum is one part of blood plasma. What happens if we mix different blood groups? If one drop of blood from one type is mixed with blood or serum from other blood type, red blood cells are glued to each other and this is called agglutination. In that case, the red blood cells usually fall apart and cause hemolysis of the blood. This is why it is important to determine blood groups. Using agglutination tests, it is showed that the people have four blood types: O, A, B and AB. Red blood cells of O do not agglutinate with the serum of any group. In other words, the blood group O can be given to anyone for the purposes of...
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