What does the Rh factor indicate?

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Multiple Choice

What does the Rh factor indicate?

Explanation:
The Rh factor reflects whether the D antigen is present on red blood cells. If the D antigen is present, a person is Rh positive; if it is absent, they are Rh negative. This distinction is how Rh typing is determined in blood grouping and is separate from the ABO system. The D antigen is the most immunogenic part of the Rh system, which is why Rh status matters for transfusions and pregnancy. The other statements don’t describe what the Rh factor indicates: ABO type involves A and B antigens; Rh status is about the D antigen, not white blood cell count, and it is directly related to the presence of the D antigen.

The Rh factor reflects whether the D antigen is present on red blood cells. If the D antigen is present, a person is Rh positive; if it is absent, they are Rh negative. This distinction is how Rh typing is determined in blood grouping and is separate from the ABO system. The D antigen is the most immunogenic part of the Rh system, which is why Rh status matters for transfusions and pregnancy. The other statements don’t describe what the Rh factor indicates: ABO type involves A and B antigens; Rh status is about the D antigen, not white blood cell count, and it is directly related to the presence of the D antigen.

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