In a suspected transfusion-related hemolytic reaction, what does elevated plasma free hemoglobin indicate?

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Multiple Choice

In a suspected transfusion-related hemolytic reaction, what does elevated plasma free hemoglobin indicate?

Intravascular destruction of red cells releases hemoglobin directly into the plasma. In a suspected transfusion-related hemolytic reaction, donor red cells are lysed in circulation, so plasma free hemoglobin rises as a direct marker of that hemolysis. This pattern reflects acute red cell destruction, which can also lead to low haptoglobin and possible hemoglobinuria as the kidneys filter the free hemoglobin. Dehydration wouldn’t cause a sudden increase in plasma free hemoglobin. Liver failure tends to alter bilirubin and liver enzymes rather than cause rapid intravascular hemolysis. Iron overload is a chronic issue from repeated transfusions and does not acutely elevate plasma free hemoglobin.

Intravascular destruction of red cells releases hemoglobin directly into the plasma. In a suspected transfusion-related hemolytic reaction, donor red cells are lysed in circulation, so plasma free hemoglobin rises as a direct marker of that hemolysis. This pattern reflects acute red cell destruction, which can also lead to low haptoglobin and possible hemoglobinuria as the kidneys filter the free hemoglobin.

Dehydration wouldn’t cause a sudden increase in plasma free hemoglobin. Liver failure tends to alter bilirubin and liver enzymes rather than cause rapid intravascular hemolysis. Iron overload is a chronic issue from repeated transfusions and does not acutely elevate plasma free hemoglobin.

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