Which statement about ABO compatibility is accurate?

Which statement about ABO compatibility is accurate?

• A. ABO compatibility is not considered in transfusions.
• B. Rh compatibility is irrelevant to transfusion safety.
• C. ABO compatibility ensures there will never be any transfusion reaction.
• D. ABO compatibility reduces risk of hemolytic transfusion reactions.

Answer: (D)

ABO compatibility is crucial because the recipient’s plasma contains antibodies against ABO antigens. If donor red cells carry A or B antigens that the recipient’s antibodies recognize, they will bind and often cause rapid destruction of the transfused cells, leading to a hemolytic transfusion reaction. Matching ABO groups between donor and recipient minimizes this dangerous immune response, so the statement that ABO compatibility reduces the risk of a hemolytic transfusion reaction is the best choice. The other ideas aren’t accurate: ABO compatibility is a standard safety measure, not something ignored in transfusions. Rh status also matters for transfusion safety because Rh incompatibility can lead to alloimmunization and complications in future transfusions or pregnancies, even though it’s not the primary cause of acute hemolytic reactions. And even with perfect ABO compatibility, other transfusion reactions can still occur (fever, allergy, TRALI, TACO, infections), so compatibility does not guarantee that no reaction will happen.

ABO compatibility is crucial because the recipient’s plasma contains antibodies against ABO antigens. If donor red cells carry A or B antigens that the recipient’s antibodies recognize, they will bind and often cause rapid destruction of the transfused cells, leading to a hemolytic transfusion reaction. Matching ABO groups between donor and recipient minimizes this dangerous immune response, so the statement that ABO compatibility reduces the risk of a hemolytic transfusion reaction is the best choice.

The other ideas aren’t accurate: ABO compatibility is a standard safety measure, not something ignored in transfusions. Rh status also matters for transfusion safety because Rh incompatibility can lead to alloimmunization and complications in future transfusions or pregnancies, even though it’s not the primary cause of acute hemolytic reactions. And even with perfect ABO compatibility, other transfusion reactions can still occur (fever, allergy, TRALI, TACO, infections), so compatibility does not guarantee that no reaction will happen.