The World Health Organization (WHO) defines pregnancy anaemia as those expectant mothers with haemogloblin (Hb) concentration lesser than 11⋅0 g per deciliter when at sea level or when the total volume ratios of the red blood cells to blood is less than 33⋅0 %, irrespective of gestation(2,3). The gene discussed is GSTM1; the disease is anemia (phenotype).