Early Pregnancy Hemoglobin A1C and Pregnancy Outcomes: A Population-Based Study

Area of Science:

• Obstetrics and Gynecology
• Endocrinology
• Perinatal Medicine

Background:

• Prediabetes screening in early pregnancy is common for identifying women at risk of overt diabetes.
• The clinical implications of prediabetes diagnosed during early pregnancy remain incompletely understood.
• Assessing the association between early pregnancy prediabetes and adverse maternal/neonatal outcomes is crucial for clinical management.

Purpose of the Study:

• To investigate the association between prediabetes identified in early pregnancy and the risk of adverse pregnancy outcomes.
• To determine if early pregnancy prediabetes is a predictor for gestational diabetes mellitus (GDM) and other complications.
• To quantify the risks of adverse outcomes in pregnant women with prediabetes compared to those with normal glucose tolerance.

Main Methods:

• Retrospective cohort study utilizing electronic medical records and birth certificate data (2011-2014).
• Inclusion of 7,020 pregnant women, with prediabetes defined by hemoglobin A1C (A1C) levels of 5.7-6.4%.
• Modified Poisson's regression analysis to calculate adjusted relative risks (RRs) for GDM and other adverse outcomes.

Main Results:

• Prediabetes was diagnosed in 3.4% (239/7,020) of the study population.
• Women with prediabetes had a significantly higher incidence of GDM (48%) compared to women with normal A1C (<5.7%, 11%).
• The adjusted relative risk for GDM in prediabetic women was 2.8 (95% CI: 2.4-3.3); no significant associations were found for other adverse maternal or neonatal outcomes.

Conclusions:

• Early pregnancy prediabetes is a significant risk factor for the development of gestational diabetes mellitus.
• The findings underscore the importance of identifying and potentially managing prediabetes in early pregnancy.
• Further research is warranted to explore the efficacy of early interventions in mitigating GDM risk among prediabetic pregnant women.