Gestational Diabetes Mellitus — UKMLA MCQ
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Correct answer: A — Two‑step approach: 50‑g 1‑h screen (130-140 mg/dL threshold)
ACOG supports the two‑step screening: 50‑g glucose challenge at 24-28 weeks followed by a 100‑g 3‑h OGTT using Carpenter‑Coustan thresholds if screening positive. One‑step is an alternative in some settings but not the primary ACOG approach. A1c or fasting glucose alone at 24-28 weeks is inadequate.
Reference: ACOG Practice Bulletin (2018): Gestational Diabetes Mellitus (No. 190)