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Answer very briefly, the following:

Why is it necessary to know The blood groups of the donor as well as the recipient ?

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Before transfusion of blood, it is most essential to determine the blood group of the  donor and the recipient. The blood group of the donor and the recipient must match with  each other, otherwise the RBC’s will stick to each other and thus the life of a recipient  may be in danger as the blood groups are different. The sticking is due to the antigens  (proteins) found in the blood of the donor and the antibodies found in the blood of the  recipient.

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