GSTM1 and Iron deficiency anemia: Rabindrakumar et al. showed that, with 70% sensitivity and 40% specificity, certain parameters of a certain value, including MCV and MCHC, can be prognostic factors and precede early iron deficiency anemia—namely: Hb < 12.2 g/dL, MCV < 83.2 fl, MCH < 26.9 pg and MCHC < 33.2 g/dL [43].