Each person has not only a blood type, but also a red (red blood cells) and white (leukocytes) blood group. This is due to the fact that blood cells have different antigenic structures. If we talk about the leukocyte blood group, this is due to the structural features of leukocyte antigens. As a result of research, scientists have identified the presence of some antigenic determinants on blood leukocytes. These determinants are determined by polymorphisms of immunoglobulins and leukocytes of types A, B and O. It is this feature that allows people to be united into separate groups,