A 26-year-old primigravida at 28 weeks undergoes a 75 g OGTT. Results: fasting plasma glucose 88 mg/dL, 1-hour 188 mg/dL, 2-hour 152 mg/dL. According to IADPSG criteria (adopted by WHO 2013 and most Indian guidelines), this result is:

• A Normal — no GDM
• B GDM — 1-hour value of 188 mg/dL meets IADPSG threshold of ≥180 mg/dL ✓
• C GDM — fasting is below threshold but 1-hour ≥180 mg/dL qualifies
• D Impaired glucose tolerance only — repeat OGTT in 4 weeks

Explanation

IADPSG 2010 criteria for GDM diagnosis on 75 g OGTT: fasting ≥92 mg/dL, 1-hour ≥180 mg/dL, or 2-hour ≥153 mg/dL — any ONE threshold met diagnoses GDM. Fasting is 88 (normal), 1-hour is 188 ≥180 (meets criterion), 2-hour is 152 (just below 153 threshold). The 1-hour value of 188 mg/dL alone satisfies IADPSG criteria for GDM. Note: 2-hour value of 152 is marginally below the 153 threshold and does not independently diagnose GDM. The diagnosis is made on the 1-hour value.

Reference: Williams Obstetrics, 26th ed.

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Written and medically reviewed by the StethoPrep medical team.