First-Trimester Fasting Hyperglycemia without Gestational Diabetes Mellitus is not Associated with Adverse Pregnancy Outcomes:A Prospective Cohort Study in China

Abstract Background Gestational diabetes mellitus (GDM) is a common pregnancy-induced metabolic complication worldwide. At present, a variety of strategies for diagnosis and management of GDM have been recommended. Our aim is to investigate the clinical features and pregnancy outcomes among women in whom a first-trimester fasting glucose value (≥ 5.10 mmol/L but < 7.0 mmol/L) was detected and a 2-h 75-g oral glucose tolerance test (OGTT) between 24–28 weeks was negative.Methods This is a prospective cohort study of women who registered and delivered between June 2016 and November 2019 at First Hospital, Jilin University. Pregnant women who met the inclusion criteria were categorized as normal first-trimester fasting plasma glucose(FPG)(< 5.10 mmol/L) and first-trimester fasting hyperglycemia (≥ 5.10 mmol/L but < 7 mmol/L).Outcomes included weeks at time of delivery, neonatal birth weight, Apgar score at 1 min, Apgar score at 5 min, prevalence of macrosomia, hypertensive disorders of pregnancy ,primary cesarean delivery, preterm delivery ,premature rupture of membranes and sillbirth or neonatal death were compared after women who developed gestational diabetes mellitus (GDM) were excluded.Results In our population of 2124 eligible subjects, pregnant women with first-trimester fasting hyperglycemia (≥ 5.10 mmol/L but < 7 mmol/L) constituted 20.8% of the total study population and accounted for 27.6% of subsequent GDM diagnosis. The other 1683 had a normal first-trimester FPG (< 5.1 mmol/L), accounting for 11.6% of all subsequent GDM diagnosis (p < 0.01).After excluding women with a diagnosis of GDM between 24 and 28 weeks of gestation, we observed no significant difference between groups for adverse maternal and prenatal outcomes.Conclusion More than two thirds of first-trimester fasting hyperglycemia pregnant women will have a normal OGTT performed at 24–28 week and of these women whom in no increased risk of adverse pregnancy outcomes have been identified.