Associations of maternal serum ferritin levels across gestation with gestational diabetes mellitus: A longitudinal cohort study.

Background: The longitudinal changes in maternal serum ferritin (SF) levels across gestation, which indirectly reflect iron supplementation, have not been extensively investigated in relation to gestational diabetes mellitus (GDM).

Methods: We conducted a retrospective cohort study at a tertiary maternal hospital in Shanghai. Women with SF concentration measurements at 8.