What test could provide the diagnosis differential for -thalassemia minor and iron deficiency?

Question

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Hemoglobin electrophoresis can differentiate between the two conditions by identifying the percentage of each type of hemoglobin present. In -thalassemia minor, there is an increased amount of HbA2 and HbF, while in iron deficiency, there is a decrease. PB smear, iron studies, and bone marrow aspirate may provide additional information but cannot definitively diagnose the condition.

What Test Could Provide the Diagnosis Differential for -Thalassemia Minor