Glucose tolerance test

Glucose tolerance test is a topic covered in the Guide to Diagnostic Tests.

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Glucose tolerance test (oral), serum or plasma

Fasting: < 100 mg/dL

1-hour: < 180 mg/dL

2-hour: < 140 mg/dL

[Fasting: < 5.6 mmol/L

1-hour: < 10.0 mmol/L

2-hour: < 7.7 mmol/L]

SST, PPT (light green), gray


Subjects should receive a 150- to 200-g per day carbohydrate diet for at least 3 days before the test. A 75-g glucose dose is dissolved in 300 mLof water for adults (1.75 g/kg for children) and given after an overnight fast. Serial determinations of plasma or serum venous blood glucoses are obtained at baseline, 1 hour, and 2 hours.

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