FN1 and gestational diabetes: Maternal serum fibronectin levels were significantly lower (p = 0.007) in GDM group, 224.2 μg/mL (interquartile range (IQR) 156.8–270.6 μg/mL), compared to the control group 264.8 μg/mL (224.6–330.6 μg/mL, p < 0.01).