Blood type determines the antigens found on the surfaces of red blood cells, and consequently, the antibodies found in the blood associated with these antigens. Antigens act as identifiers to which antibodies can bind. read more
The difference between blood groups is based on the antigen present on the red blood cell membrane. Corollary to that, whatever the antigen is on the cell membrane, the opposite antibody is present in the plasma. For example, a blood type A person would have A antigen on the cell membrane and anti-B antibody in the plasma. read more
The difference between blood types has to do with the type of antigens on the red blood cells (RBC's) and the type of antibodies present in the blood. For example, type A blood has the A antigen on the RBC, and the B antibody present in the blood. read more