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Microcytic anemia::: iron deficiency is the most common cause and can be ruled out with iron studies... the next 2 causes are anemia of chronic disease and thalassemia... if iron studies come normal and the patient has no chronic disease, check a HEMOGLOBIN ELECTROPHORESIS to diagnose thalassemia's... thalassemia's will also have target cells and nucleated RBC' on peripheral smear
