GSTM1 and anemia: In accordance with the current study, HemoCue® Hb-301 and Hb-801 reported a mean bias in Hgb concentration of 0.4 g/dL and 0.2 g/dL, respectively, as well as low sensitivities for detecting anemia (HemoCue® Hb-301: 54.3%; HemoCue® Hb-801: 66.7%).