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Blood type tests 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, which is either present (positive, +) or absent (negative, -). So the two most common blood type tests are the ABO and Rh tests.
To find out your blood group, a sample of your blood has to be taken and tested. However, GPs do not routinely check people's blood groups. You can also find out your blood group by giving blood.