According to IADPSG criteria, gestational diabetes is diagnosed if any value on a 75-g OGTT meets or exceeds which thresholds?

• A. Fasting ≥92 mg/dL, 1 hour ≥180 mg/dL, 2 hours ≥153 mg/dL
• B. Fasting ≥100 mg/dL, 1 hour ≥180 mg/dL, 2 hours ≥130 mg/dL
• C. Fasting ≥90 mg/dL, 1 hour ≥170 mg/dL, 2 hours ≥140 mg/dL
• D. Fasting ≥95 mg/dL, 1 hour ≥180 mg/dL, 2 hours ≥153 mg/dL

Answer: (A)

Under IADPSG criteria, gestational diabetes is diagnosed if any value on the 75-gram oral glucose tolerance test reaches or exceeds: fasting 92 mg/dL, 1 hour 180 mg/dL, or 2 hours 153 mg/dL. This one-abnormal-value rule comes from the HAPO study, which linked maternal glucose levels to adverse outcomes and set these thresholds to reflect a meaningful increase in risk. The other threshold sets don’t match these cutoffs, so they wouldn’t be diagnostic under this standard.