why is blood grouping necessary for blood transfusion

Solution:

Blood grouping is important for the transfusion of blood and donation of organs. Before blood transfusion, the Rh factor, as well as the blood group of the donor and the recipient have to be matched. The blood group of the donor must be compatible with the recipient's blood, otherwise it may lead to serious consequences (clotting) for the patient that may be dangerous or even fatal.