Which combination of findings is most specific for immune-mediated hemolysis?

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Multiple Choice

Which combination of findings is most specific for immune-mediated hemolysis?

Immune-mediated hemolysis is suggested when there is direct evidence that red cells are targeted by antibodies or complement, along with a bone marrow response and characteristic cell changes. A positive Coombs' test shows antibodies or complement attached to red blood cells, which is a hallmark of immune-mediated destruction. Reticulocytosis indicates the bone marrow is actively compensating for anemia caused by the destruction of red cells. Spherocytes arise when immune processes remove the red cell membrane, producing smaller, spherical cells typical of immune-mediated intravascular or extravascular hemolysis. Together, these findings—Coombs' positivity confirming an immune process, increased reticulocytes showing a reactive marrow, and spherocytes demonstrating membrane loss from immune attack—make this combination the most specific for immune-mediated hemolysis. Other options don’t consistently indicate an immune mechanism: low retic and monocytes point away from active hemolysis; elevated alkaline phosphatase with a normal smear is not diagnostic of IMH; a normal Coombs' test with no reticulocytosis argues against an immune-mediated process.

Immune-mediated hemolysis is suggested when there is direct evidence that red cells are targeted by antibodies or complement, along with a bone marrow response and characteristic cell changes.

A positive Coombs' test shows antibodies or complement attached to red blood cells, which is a hallmark of immune-mediated destruction. Reticulocytosis indicates the bone marrow is actively compensating for anemia caused by the destruction of red cells. Spherocytes arise when immune processes remove the red cell membrane, producing smaller, spherical cells typical of immune-mediated intravascular or extravascular hemolysis.

Together, these findings—Coombs' positivity confirming an immune process, increased reticulocytes showing a reactive marrow, and spherocytes demonstrating membrane loss from immune attack—make this combination the most specific for immune-mediated hemolysis.

Other options don’t consistently indicate an immune mechanism: low retic and monocytes point away from active hemolysis; elevated alkaline phosphatase with a normal smear is not diagnostic of IMH; a normal Coombs' test with no reticulocytosis argues against an immune-mediated process.

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