Management of Gestational Diabetes Mellitus

Initial Management Approach

The American Diabetes Association recommends lifestyle modifications as the cornerstone of GDM management, with insulin added only when needed to achieve glycemic targets 1, 2
Initial treatment begins with medical nutrition therapy, physical activity, and weight management, targeting fasting glucose <95 mg/dL, one-hour postprandial glucose <140 mg/dL, and two-hour postprandial glucose <120 mg/dL 2, 1
An individualized nutrition plan should be developed with a registered dietitian nutritionist (RDN) familiar with GDM management, providing adequate calorie intake to promote fetal/neonatal and maternal health, achieve glycemic goals, and promote appropriate weight gain 2, 3, 1

Insulin is the preferred medication for treating hyperglycemia in GDM when lifestyle modifications are insufficient, with no specific insulin or insulin analog regimen demonstrating superiority in GDM 1, 4, 2
Metformin and glyburide should not be used as first-line agents as both cross the placenta to the fetus, but glyburide can be considered as an adjunct to lifestyle modifications when insulin is not an option 1, 4, 2, 3

Self-monitoring of blood glucose (SMBG) is essential for assessing glycemic control, and continuous glucose monitoring (CGM) may be beneficial for patients with type 1 diabetes but is not established for GDM 4
Telehealth visits have been shown to improve outcomes compared with standard in-person care, and psychosocial assessment is encouraged to detect issues such as depression, eating disorders, stress, and anxiety that may interfere with treatment adherence 1, 2, 3
Ultrasound measurement of fetal abdominal circumference starting in the second and early third trimesters, repeated every 2-4 weeks, can guide management decisions, and mothers should be taught to monitor fetal movements during the last 8-10 weeks of pregnancy 3, 5

Women with GDM should be tested for persistent diabetes or prediabetes at 4-12 weeks postpartum with a 75-g OGTT using non-pregnancy criteria, and continued testing every 1-3 years is recommended due to the 50-70% lifetime risk of developing type 2 diabetes 6
Breastfeeding is recommended as it may reduce obesity in children and provide metabolic benefits to both mother and offspring, and postpartum weight loss should be encouraged for women who were overweight or obese during pregnancy 6
Healthy eating patterns have been associated with significantly lower subsequent diabetes risk after GDM, and both metformin and intensive lifestyle intervention can prevent or delay progression to diabetes in women with prediabetes and a history of GDM 6

All women with a history of GDM should have family planning options reviewed regularly, and planning pregnancy is critical due to the increased risk of recurrent GDM in subsequent pregnancies 6

Failure to recognize the continuous relationship between maternal hyperglycemia and adverse outcomes, inadequate monitoring of fetal growth, overlooking the importance of postpartum testing for diabetes, and neglecting the long-term follow-up needed for women with a history of GDM can lead to poor outcomes 2, 3, 6