Indian Council of Medical Research defines anemia as hemoglobin (Hb) less than 11 g/dl (gram per deciliter) during pregnancy and further classifies it into mild, moderate, severe, and very severe if Hb levels are < 11g/dl, 7-9g/dl, 4-7g/dl, and <4g/dl, respectively [6]. Here, GSTM1 is linked to anemia (phenotype).