There are ABO antigens, which designate ABO blood ... forward typing and reverse typing. During forward typing, the blood sample is mixed with antibodies against type A and B blood.

ABO blood grouping is based on differences in the type of glycoprotein (protein with carbohydrates attached) present on the surface of red blood cells. Type A individuals have type A glycoproteins; ...

In cases of questioned paternity, ABO blood-typing can be used to exclude a man from being a child's father. For example, a man who has type AB blood could not father a child with type O blood ...

Typing of the specimens was completed within twenty-four hours of collection. Blood was typed for ABO group and for Rh types C, D, E and c by the modified tube method. Commercial typing serum from ...