GSTM1 and gestational diabetes: Increased values of Hb, Hct, RBC, and fasting glucose concentrations in the early second trimester in patients with GDM have been reported by a previous cohort and cross-sectional studies, and a measurement oh Hbm Hct, RBC, and fasting glucose concentration was marked as a potential marker panel for early prediction of GDM [20,21,22].