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Understanding gestational diabetes
Audience: patients-public, students-learners ยท Review state: published
What it is
Gestational diabetes is diabetes first found during pregnancy. Hormones made by the placenta can block the action of insulin, so blood sugar rises higher than normal, usually in the second half of pregnancy.
It affects a meaningful share of pregnancies and usually goes away after the baby is born, but it needs careful management while it lasts.
Why it matters
When blood sugar stays high, the extra sugar crosses the placenta and the baby can grow too large, which raises the chance of a difficult delivery or a cesarean birth. It also raises the risk of early delivery, high blood pressure in pregnancy, and low blood sugar in the newborn right after birth.
Good control of blood sugar greatly reduces these risks.
Testing and diagnosis
Most pregnant women are screened between 24 and 28 weeks with a glucose challenge test, drinking a sweet solution followed by a blood test. If the result is high, a longer oral glucose tolerance test confirms the diagnosis.
Women with risk factors - previous gestational diabetes, obesity, a close relative with diabetes, or certain ethnic backgrounds - may be tested earlier.
Management and after birth
Treatment centers on healthy eating spread across the day, regular moderate physical activity as advised, and checking blood sugar at home. Many women manage with these steps alone; when targets are not met, insulin or other medicines are added.
After delivery, blood sugar usually returns to normal, but it should be rechecked about 6 to 12 weeks after birth. Having had gestational diabetes raises the lifetime risk of type 2 diabetes, so ongoing healthy habits and periodic testing are recommended.
Limitations
General educational overview, not medical advice and not a diagnosis. Pregnancy care and blood sugar targets are individual and belong with the maternity care team.