A 28-year-old primigravida at 24 weeks undergoes a 75-g OGTT. Fasting glucose is 95 mg/dL; 1-hour glucose is 185 mg/dL; 2-hour glucose is 155 mg/dL. According to IADPSG criteria, how many values meet the GDM threshold?
- A Only fasting value
- B Only 1-hour value
- C All three values (fasting ≥92, 1-hour ≥180, 2-hour ≥153) ✓
- D Only 2-hour value
Correct answer: C. All three values (fasting ≥92, 1-hour ≥180, 2-hour ≥153)
Explanation
IADPSG/WHO 2013 GDM thresholds: fasting ≥92 mg/dL, 1-hour ≥180 mg/dL, 2-hour ≥153 mg/dL — any ONE value meeting or exceeding these cutoffs diagnoses GDM. In this case: fasting 95 ≥92 (met), 1-hour 185 ≥180 (met), 2-hour 155 ≥153 (met). All three values exceed the respective thresholds, confirming GDM. Only one criterion needs to be met for diagnosis, but all three being positive suggests a more significant degree of glucose intolerance.
Reference: Williams Obstetrics, 26th ed.
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Written and medically reviewed by the StethoPrep medical team.