Which statement best describes the role of the D antigen in transfusion medicine?

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Multiple Choice

Which statement best describes the role of the D antigen in transfusion medicine?

D antigen is the Rh antigen on red blood cells; its presence designates Rh positivity. This concept is central in transfusion medicine because matching Rh status prevents the recipient from forming anti-D antibodies, reducing the risk of hemolytic transfusion reactions and, during pregnancy, the potential for hemolytic disease of the fetus and newborn. The D antigen is not used to determine ABO blood type, which relies on A and B antigens. It also has nothing to do with differentiating lactose fermenters or with Pap smear testing, which are about bacterial sugar metabolism and cervical cancer screening, respectively.

D antigen is the Rh antigen on red blood cells; its presence designates Rh positivity. This concept is central in transfusion medicine because matching Rh status prevents the recipient from forming anti-D antibodies, reducing the risk of hemolytic transfusion reactions and, during pregnancy, the potential for hemolytic disease of the fetus and newborn. The D antigen is not used to determine ABO blood type, which relies on A and B antigens. It also has nothing to do with differentiating lactose fermenters or with Pap smear testing, which are about bacterial sugar metabolism and cervical cancer screening, respectively.

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