Their Hb levels were normal [123-156 g/L (mean, 143 g/L); and their RBC count, 3.88-5.47 × 1012/L (mean, 5.1 × 1012/L); MCV, 68.9-92.4 fl (mean, 82.8 fl); MCH, 23.4-31.6 pg (mean, 28.4 pg); and RDW, 12.4-14.5 (mean, 13.3) were normal in all cases, except 1 case, which showed microcytic hypochromic red cells with normal RDW and target cells that raised the possibility of a coexistent alpha-thalassemia trait. Here, GSTM1 is linked to Alpha-thalassemia.