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Haemogram of a schoolboy seen at a thalassaemia screening camp: Hb 10.8 g/dL, RBC count 6.2 million/µL, MCV 62 fL, MCH 19 pg and RDW 13.5% (reference 11.5-14.5%). Serum ferritin is 85 ng/mL (normal). What does his Mentzer index suggest?
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