The peripheral blood smear contains a normocytic, normochromic morphology with marked reticulocytosis. The hemoglobin solubility test is positive. What confirmatory test should follow?

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The positive hemoglobin solubility test along with the peripheral blood smear findings suggest a possible diagnosis of sickle cell disease. Hemoglobin electrophoresis can confirm the diagnosis by identifying the abnormal hemoglobin variant present in the patient's blood. Bilirubin analysis and haptoglobin analysis may be useful in assessing the extent of hemolysis, but they are not confirmatory tests for sickle cell disease. Bone marrow aspiration may reveal evidence of increased erythropoiesis and hemolysis, but it is not a primary diagnostic test for sickle cell disease.

The Peripheral Blood Smear Contains a Normocytic, Normochromic Morphology with Marked