Which three blood antigens are most important when performing standard blood typing?

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Testing for blood type centers on three important surface markers on red blood cells: A, B, and the Rh factor (D). The A and B antigens define the ABO group: if A is present, the person is type A; if B is present, type B; if both are present, type AB; if neither is present, type O. The Rh(D) antigen determines Rh status: presence means Rh positive, absence means Rh negative. These three markers are the most clinically relevant because they drive transfusion compatibility and the risk of immune reactions. The D antigen is especially important due to its strong immunogenicity, so standard typing always includes Rh status. Other Rh antigens like C or E exist, but they aren’t used in routine typing, and O is not an antigen on its own—it's the type that results from having neither A nor B. Hence the combination of A, B, and Rh (D) is the essential trio for standard blood typing.