- In addition to the ABO system, the next important system
is the Rhesus (Rh) group.
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- There are six common types of Rh antigens or factors:
C, D, E, c, d and e.
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- The type D antigen is the most common and is also the
most antigenic of the six. Thus when one refers to the Rh system, one
is usually referring to the D type.
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- Someone that has inherited the D antigen is considered
to be Rh +ve, while someone that does not express the D antigen, is
considered to be Rh -ve.
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