Gestational diabetes affects 2-10% of pregnancies. While often resolving after delivery, it has important implications for both pregnancy and long-term maternal health.
What Causes It
During pregnancy, placental hormones reduce insulin sensitivity progressively. Most women's bodies compensate with increased insulin production. In some women, this compensation is insufficient, leading to elevated glucose levels.
Risk factors include maternal obesity, age over 25, family history of diabetes, and prior gestational diabetes. However, it can develop in women with no risk factors.
Diagnosis
Screening occurs between 24-28 weeks gestation. A glucose challenge test determines if further testing is needed. An oral glucose tolerance test definitively diagnoses gestational diabetes.
Management During Pregnancy
Most cases are managed with dietary modification alone. Carbohydrate consistency at each meal prevents extreme glucose fluctuations. Frequent small meals maintain glucose stability.
Self-monitoring of blood glucose 4 times daily (fasting and 2 hours after each meal) identifies successful control. Many women achieve target glucose levels through diet alone.
Approximately 10-20% require insulin therapy despite dietary compliance. Insulin does not harm the fetus and is necessary when dietary management is insufficient.
Fetal Implications
Uncontrolled gestational diabetes increases risks of excessive fetal growth, birth complications, and neonatal hypoglycemia. With appropriate management, these risks return to near-baseline levels.
Postpartum Course
Glucose levels typically normalize after delivery. However, comprehensive metabolic screening should confirm normal glucose regulation. Most women's pancreases recover full function.
Long-Term Outlook
Women with gestational diabetes have a 35-60% risk of developing type 2 diabetes within 10-20 years. Annual glucose screening and lifestyle modification significantly reduce this risk. Weight management, regular exercise, and dietary attention substantially lower progression rates.