The Anti-B reagent is for the in vitro detection and identification of the B antigen on human red blood cells by direct agglutination. The formulation also contains sodium chloride and EDTA and 1g/l sodium azide. The reagent is coloured yellow with tartrazine.
| Name of Blood Group | Antigens present on the red cell surface | ABO antibodies present in the plasma |
|---|---|---|
| Type O | nil | anti-A and anti-B |
| Type A | A antigen | anti-B |
| Type B | B antigen | anti-A |
| Type AB | A and B antigens | nil |