Which factors increase the risk of RBC alloimmunization?

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Multiple Choice

Which factors increase the risk of RBC alloimmunization?

Alloimmunization happens when the recipient’s immune system encounters red cell antigens it doesn’t recognize as self and makes antibodies against them. The main drivers are exposure to non-self red cell antigens, which most often happens through transfusion or during pregnancy. Each time someone is exposed to foreign RBC antigens—such as during a transfusion or when a pregnant person carries a fetus with paternal antigens—the immune system can become sensitized and form alloantibodies. With additional exposures, the chance of developing these antibodies increases because memory immune cells remember those specific antigens and respond more readily. That’s why a history of prior transfusions and pregnancies, especially with exposure to non-self RBC antigens, is the strongest risk factor for RBC alloimmunization. Iron overload is about iron burden, not immune sensitization. Autoimmune disease involves autoantibodies against self, not alloantibodies to donor antigens. Vaccination history does not influence RBC alloimmunization.

Alloimmunization happens when the recipient’s immune system encounters red cell antigens it doesn’t recognize as self and makes antibodies against them. The main drivers are exposure to non-self red cell antigens, which most often happens through transfusion or during pregnancy. Each time someone is exposed to foreign RBC antigens—such as during a transfusion or when a pregnant person carries a fetus with paternal antigens—the immune system can become sensitized and form alloantibodies. With additional exposures, the chance of developing these antibodies increases because memory immune cells remember those specific antigens and respond more readily.

That’s why a history of prior transfusions and pregnancies, especially with exposure to non-self RBC antigens, is the strongest risk factor for RBC alloimmunization. Iron overload is about iron burden, not immune sensitization. Autoimmune disease involves autoantibodies against self, not alloantibodies to donor antigens. Vaccination history does not influence RBC alloimmunization.

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