The advantage of AB blood type is that all blood types can be given blood transfusions, no disadvantages. The advantage of AB blood type is that AB blood type is known as the universal blood recipient, AB blood type has the characteristics of both A and B. In case of emergency, all other blood types can give blood transfusion to AB blood type, this is because in the ABO blood type system, A blood type expresses a antigen on the surface of the serum of A antigens to express the antibodies of b, and the serum of B antigens on the surface of the serum of B antigens to express the antibodies of a. AB blood type, due to the surface expression of A antigen and B antigen, there is no any antibody in the serum, so he can receive any blood type, no disadvantage. Blood type AB, due to the surface expression of A antigen and B antigen, there is no antibody in the serum, so he can receive red blood cells of any blood type, because there is no antibody in its serum that can react with red blood cells. In fact, however, blood transfusion is now strictly based on the principle of homotypic transfusion and requires cross-matching and other tests. As one of the blood types of red blood cells, there are no so-called advantages or disadvantages of AB blood.