TG and gestational diabetes: A cross-sectional analysis (27) among 600 non-Hispanic white women also reported that fasting thyroid hormones, especially T3/fT4 ratio, were significantly associated with maternal glucose and C-peptide levels [z score sums (fasting and 1 and 2 h), p < 0.001], while another study in Hispanic women suggested that GDM risk increased with thyrotropin levels (28).