Why is Rh(D) typing critical in transfusion and obstetric practice?

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Multiple Choice

Why is Rh(D) typing critical in transfusion and obstetric practice?

Rh(D) typing is essential because it identifies whether a patient’s red cells express the D antigen, which determines risk of anti-D alloimmunization. In obstetrics, an Rh-negative mother carrying an Rh-positive fetus can become sensitized to the D antigen during pregnancy or delivery. Once anti-D antibodies develop, they can cross the placenta in future pregnancies and attack fetal red cells, causing hemolytic disease of the fetus/newborn. To prevent this, Rh immune prophylaxis with anti-D immunoglobulin is given to Rh-negative women during pregnancy and after delivery, reducing or eliminating sensitization and the risk of HDFN. In transfusion practice, giving Rh-negative recipients Rh-positive blood can prompt anti-D formation and potential hemolytic reactions with future exposures, so ensuring Rh compatibility is a key safety measure. The option about detecting anti-D alloantibodies as the primary aim describes a downstream outcome rather than the preventive purpose of Rh(D) typing; ABO compatibility is addressed separately, and screening for minor alloantibodies is not the primary goal of Rh typing.

Rh(D) typing is essential because it identifies whether a patient’s red cells express the D antigen, which determines risk of anti-D alloimmunization. In obstetrics, an Rh-negative mother carrying an Rh-positive fetus can become sensitized to the D antigen during pregnancy or delivery. Once anti-D antibodies develop, they can cross the placenta in future pregnancies and attack fetal red cells, causing hemolytic disease of the fetus/newborn. To prevent this, Rh immune prophylaxis with anti-D immunoglobulin is given to Rh-negative women during pregnancy and after delivery, reducing or eliminating sensitization and the risk of HDFN. In transfusion practice, giving Rh-negative recipients Rh-positive blood can prompt anti-D formation and potential hemolytic reactions with future exposures, so ensuring Rh compatibility is a key safety measure. The option about detecting anti-D alloantibodies as the primary aim describes a downstream outcome rather than the preventive purpose of Rh(D) typing; ABO compatibility is addressed separately, and screening for minor alloantibodies is not the primary goal of Rh typing.

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