Which test is essential to evaluating hemolytic anemia?

Which test is essential to evaluating hemolytic anemia?

• A. Coombs test
• B. Reticulocyte count
• C. Bone marrow biopsy
• D. Serum ferritin

Answer: (A)

When evaluating hemolytic anemia, you want to know whether the red cells are being targeted by the immune system. The direct antiglobulin test, also called the direct Coombs test, is the essential test for this. It looks for antibodies or complement attached to red blood cells in the patient’s blood. A positive result indicates immune-mediated hemolysis, as seen in autoimmune hemolytic anemia or transfusion reactions, and helps distinguish it from nonimmune causes of hemolysis. Reticulocyte count shows how vigorously the bone marrow is responding to anemia, but it doesn’t reveal the mechanism of red cell destruction. Bone marrow biopsy isn’t usually needed for initial evaluation of hemolysis. Serum ferritin reflects iron stores and isn’t used to diagnose or characterize hemolysis. If the direct Coombs test is negative but hemolysis is still suspected, you’d pursue nonimmune causes such as enzyme deficiencies or membrane disorders.

When evaluating hemolytic anemia, you want to know whether the red cells are being targeted by the immune system. The direct antiglobulin test, also called the direct Coombs test, is the essential test for this. It looks for antibodies or complement attached to red blood cells in the patient’s blood. A positive result indicates immune-mediated hemolysis, as seen in autoimmune hemolytic anemia or transfusion reactions, and helps distinguish it from nonimmune causes of hemolysis.

Reticulocyte count shows how vigorously the bone marrow is responding to anemia, but it doesn’t reveal the mechanism of red cell destruction. Bone marrow biopsy isn’t usually needed for initial evaluation of hemolysis. Serum ferritin reflects iron stores and isn’t used to diagnose or characterize hemolysis. If the direct Coombs test is negative but hemolysis is still suspected, you’d pursue nonimmune causes such as enzyme deficiencies or membrane disorders.