Early Postpartum Glucose Tolerance Reclassification by Gestational Diabetes Subtype.

Area of Science:

• Obstetrics and Gynecology
• Endocrinology
• Public Health

Background:

• Gestational diabetes (GD) is a complex condition linked to maternal and offspring metabolic disorders.
• While GD subtypes are known to affect perinatal outcomes, their impact on early postpartum maternal metabolic health remains unclear.

Purpose of the Study:

• To investigate the early postpartum glucose tolerance reclassification across different gestational diabetes (GD) subtypes.

Main Methods:

• A cohort study of 1005 women diagnosed with GD using Carpenter and Coustan criteria.
• Classification of GD into three subtypes: postload glucose intolerance (GD-P), fasting hyperglycemia (GD-F), and mixed (GD-M).
• Postpartum glucose tolerance assessed 6-9 weeks after delivery using a 2-hour, 75-g oral glucose tolerance test (OGTT); modified Poisson regression used to analyze prediabetes risks.

Main Results:

• Overall postpartum prediabetes prevalence was 34.5%, with significant variation among GD subtypes.
• Prediabetes prevalence was 23.9% for GD-P, 41.9% for GD-F, and 55.8% for GD-M.
• Compared to GD-P, adjusted prevalence ratios for postpartum prediabetes were 1.74 for GD-F and 2.23 for GD-M, indicating significantly higher risks.

Conclusions:

• Gestational diabetes subtypes exhibit distinct risks for developing postpartum prediabetes.
• Women with fasting hyperglycemia (GD-F) or mixed (GD-M) gestational diabetes subtypes have a significantly elevated risk of postpartum prediabetes.
• Early interventions targeting dysglycemia are likely most beneficial for women identified with GD-F or GD-M subtypes.