A 32-year-old primigravida at 24 weeks undergoes a 75-g OGTT. Fasting glucose is 88 mg/dL; 1-hour glucose is 162 mg/dL; 2-hour glucose is 143 mg/dL. According to IADPSG/WHO 2013 criteria, which statement correctly describes the result?
- A GDM diagnosed — 2-hour value ≥140 mg/dL meets the IADPSG threshold
- B Normal OGTT — none of the three IADPSG thresholds are met ✓
- C GDM diagnosed — fasting value ≥85 mg/dL meets the IADPSG threshold
- D Overt diabetes — 1-hour value ≥160 mg/dL confirms diagnosis
Correct answer: B. Normal OGTT — none of the three IADPSG thresholds are met
Explanation
IADPSG/WHO 2013 GDM thresholds for 75-g OGTT: fasting ≥92 mg/dL, 1-hour ≥180 mg/dL, 2-hour ≥153 mg/dL. This patient's fasting (88 mg/dL), 1-hour (162 mg/dL), and 2-hour (143 mg/dL) are all below their respective cutoffs; no threshold is met. Option A uses the older NDDG 2-hour cutoff of 140 mg/dL, which does not apply to the single-step 75-g IADPSG/WHO 2013 approach. The OGTT is therefore normal.
Reference: Williams Obstetrics, 26th ed.
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