What are your next steps in workup for a pediatric patient with microcytic anemia with normal iron levels, normal hemoglobin analysis, and normal alpha thal trait testing?  

It is a bit difficult to answer this without more information like age, H&P, the actual blood counts, a description of the peripheral blood smear, and the quantitative results of hemoglobin HPLC. If iron deficient and the many different genotypes of thalassemia are excluded and there is no chron...