FGF19 and gestational diabetes: Serum FGF19 levels were significantly lower in patients with GDM (median: 65.96 pg/ml; interquartile range: 51.76–90.11 pg/ml) than those in controls (median: 112.62 pg/ml; interquartile range: 93.35–146.83 pg/ml; P<0.001).