A pregnant woman at 26 weeks underwent a 75 g OGTT (WHO 2013/IADPSG criteria). Her fasting glucose was 5.0 mmol/L (90 mg/dL), 1-hour glucose was 10.8 mmol/L (195 mg/dL), and 2-hour glucose was 8.3 mmol/L (150 mg/dL). Which criterion(a) meet the threshold for gestational diabetes mellitus?

• A Fasting glucose only
• B 1-hour and 2-hour values both exceed thresholds
• C 1-hour glucose exceeds threshold; diagnosis of GDM confirmed ✓
• D No criteria met — all values are below thresholds

Explanation

IADPSG/WHO 2013 GDM thresholds with 75 g OGTT: Fasting ≥ 5.1 mmol/L (92 mg/dL); 1-hour ≥ 10.0 mmol/L (180 mg/dL); 2-hour ≥ 8.5 mmol/L (153 mg/dL). In this patient: Fasting 5.0 < 5.1 (does not meet); 1-hour 10.8 > 10.0 (MEETS); 2-hour 8.3 < 8.5 (does not meet). GDM is diagnosed when ANY ONE of the three values meets or exceeds the threshold. The 1-hour value of 10.8 mmol/L confirms GDM.

Reference: Williams Obstetrics, 26th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.