GSTM1 and hematologic disorder: Across all prospective clinical studies, excluding the Thailand study (which used frozen blood samples) and the UK study (which includes newborns and primarily specimens with blood disorders), the G6PD median of the STANDARD G6PD Test was within a 1.2 U/g Hb range (range 7.3–8.5 U/g Hb), with the exception of one of the US studies (Fig 1) [19].