Blood group identification

The ABO blood group system is mainly named according to the different agglutinogens (that is, blood group antigens, A, B, and H) contained on the surface of human red blood cells. ABO blood group identification refers to the detection of ABH blood group antigens. Red blood cells containing A antigen are called type A, B antigens are called type B, A and B antigens are called type AB; without A and B antigens, and H antigens are called type O. Type A human serum contains only anti-B antibodies; type B serum contains only anti-A antibodies; type AB serum has no anti-A and anti-B antibodies; and type O serum has both anti-A and anti-B antibodies. Standard anti-A and anti-B serums were used to identify the antigen on the subject's red blood cells (direct test); standard A and B red blood cells were used to identify the antibodies in the subject's serum (reverse test). The blood group type can only be confirmed if the results of the identification of the antigen on the red blood cells of the subject and the identification of the antibodies in the serum are completely consistent.