More on the test...
Blood Grouping (ABO/Rh)
Blood type tests are done before a person gets a blood transfusion and to check a pregnant woman's blood type. Human blood is typed by certain markers (called antigens) on the surface of red blood cells. Blood type may also be done to see if two people are likely to be blood relatives.
The most important antigens are blood group antigens (ABO) and the Rh antigen. Therefore, the two most common blood type tests are the ABO and Rh tests.
The ABO test shows that people have blood in one of four types: A, B, AB, or O.
Rh blood type checks for the Rh antigen (also called the Rh factor) on red blood cells. If your red blood cells:
-- Have the Rh antigen, your blood is Rh-positive.
-- Do not have the Rh antigen, your blood is Rh-negative.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions.