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Confirmatory Test for Gestational Diabetes:
The 2 hour Oral Glucose Tolerance Test


The test should be done in the morning after an overnight fast of between 8 and 14 h and after at least 3 days of unrestricted diet (>150 g carbohydrate per day) and unlimited physical activity.

Abnormal 2-hour 75 gram OGTT values are:

  • Fasting > 95 mg/dl ( 5.3 mmol/L )
  • 1 hour > 180 mg/dl ( 10.0 mmol/L )
  • 2 hour > 155 mg/dl ( 8.6mmol/L )

Two or more of the venous plasma concentrations must be met or exceeded for a positive diagnosis.   

    REFERENCE:
    *Guidelines for Care, California Diabetes and Pregnancy Program,1998

Created: 12/18/2002
Update: 11/2/2004

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