GSTM1 and thalassemia: We reviewed 10186 chromatograms in the year 2006 identifying various hemoglobin variants as follows: β -thalassaemia trait, β -thalassaemia major, Hb S disorders, Hb Q and Hb D in 319(3%), 159(1.5%), 14(0.13%), 8(0.07%) and 7(0.06%) samples respectively.