The Rh factor refers to the presence or absence of which antigen?

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Multiple Choice

The Rh factor refers to the presence or absence of which antigen?

Explanation:
The thing being tested is what the Rh factor is measuring on red blood cells. The Rh factor refers to the presence or absence of the D antigen on the surface of those cells. If the D antigen is present, a person is Rh positive; if it’s absent, they’re Rh negative. This is separate from the ABO system, where A and B antigens determine type, and O means no A or B antigens. So the Rh factor specifically points to the D antigen, not A, B, or O.

The thing being tested is what the Rh factor is measuring on red blood cells. The Rh factor refers to the presence or absence of the D antigen on the surface of those cells. If the D antigen is present, a person is Rh positive; if it’s absent, they’re Rh negative. This is separate from the ABO system, where A and B antigens determine type, and O means no A or B antigens. So the Rh factor specifically points to the D antigen, not A, B, or O.

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