Gestational diabetes screening
What the major U.S. guidelines recommend, with a link to verify each at the source. A quick-reference summary for clinicians, not medical advice.
Screen asymptomatic pregnant persons (no prior type 1 or 2 diabetes) for gestational diabetes at 24 weeks gestation or later. Options: two-step (50 g 1 hr glucose challenge, then 100 g 3 hr OGTT if positive) or one-step (75 g 2 hr OGTT). Screening before 24 weeks: grade I, evidence insufficient.
Verify at USPSTF →Screen all at 24 to 28 weeks; two-step preferred (50 g 1 hr challenge, then 100 g 3 hr OGTT, Carpenter-Coustan thresholds), one-step 75 g 2 hr OGTT acceptable by clinical judgment. No routine screening before 24 weeks. Screen early for pregestational diabetes if risk factors (prior GDM, BMI 25 or higher, 23 or higher in Asian Americans, plus a risk factor such as A1C 5.7 percent or higher or known glucose intolerance); if early test negative, rescreen at 24 to 28 weeks. 2024 Clinical Practice Update modifies Practice Bulletin 190 (2018).
Verify at ACOG →