ORs for the development of GDM + IT in women with high levels of GGT and ALT were higher than women without MetS and with low levels of GGT and ALT, whether they were with MetS (OR 6.879, 95% CI 2.232–21.204) or without MetS (OR 3.338, 95% CI 1.86–5.992). This evidence concerns the gene GPT and metabolic syndrome.