A 28-year-old primigravida at 24 weeks has a fasting plasma glucose of 92 mg/dL and a 2-hour post-75g OGTT value of 155 mg/dL. Applying IADPSG criteria, she is diagnosed with:

• A Normal glucose tolerance
• B Pre-gestational diabetes mellitus (PGDM)
• C Impaired glucose tolerance requiring repeat testing
• D Gestational diabetes mellitus (GDM) ✓

Explanation

IADPSG criteria for GDM diagnosis on 75g OGTT: fasting ≥ 92 mg/dL, 1-hour ≥ 180 mg/dL, or 2-hour ≥ 153 mg/dL (any one value met or exceeded = GDM). This woman has fasting 92 (meets threshold exactly) AND 2-hour 155 > 153 (meets threshold) — two criteria are met, confirming GDM. For PGDM, fasting ≥ 126 mg/dL or random ≥ 200 mg/dL or HbA1c ≥ 6.5% is needed; fasting 92 does not reach that threshold.

Reference: Williams Obstetrics, 26th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.