Glossary

Term · Pregnancy: Your Body

gestational diabetes

Also: diabetes in pregnancy

Blood sugar that rises for the first time in pregnancy, often found by a glucose screening test. It usually clears after birth but raises later risk.

In plain words

Gestational diabetes is high blood sugar that is first found during pregnancy. It is not the same as type 1 or type 2 diabetes that was already there before pregnancy. Most people have no symptoms. It is usually found through a glucose screening test, often between 24 and 28 weeks. Some clinicians test earlier for people at higher risk. The main concern is that extra sugar crosses the placenta, which can make the baby grow larger than usual. Blood sugar usually returns to normal after birth. Still, a person who had gestational diabetes has a higher chance of type 2 diabetes later, so follow-up testing is common. A mother may hear about meal plans, glucose checks, or extra ultrasounds.

The deeper version

Gestational diabetes is carbohydrate intolerance first recognized in pregnancy. Diagnosis follows the thresholds in ACOG Practice Bulletin 190 (2018), which draw on the HAPO study. HAPO showed continuous associations between maternal glucose and birth weight, delivery, and , with no clear threshold. Screening is typically at 24 to 28 weeks, with earlier testing for risk factors such as prior gestational diabetes, obesity, or prior large birth weight. Management pathways include nutrition therapy, home glucose monitoring, and pharmacotherapy when glucose targets are not met, as described by ACOG and the American Diabetes Association Standards of Care. The controversy is whether universal screening improves outcomes, and whether lower diagnostic thresholds identify people who benefit from treatment.

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Sources

  • American College of Obstetricians and Gynecologists — Practice Bulletin 190: Gestational diabetes mellitus (2018)
  • HAPO Study Cooperative Research Group — Hyperglycemia and adverse pregnancy outcomes. New England Journal of Medicine, 2008

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