Glucose Tolerance Calculator

Interpret oral glucose tolerance test (OGTT) results to assess for diabetes, prediabetes, or gestational diabetes.

Test Settings

Test Type

Glucose Unit

Glucose Values

Fasting Glucose (mg/dL)

1-Hour Glucose (mg/dL)

2-Hour Glucose (mg/dL)

Interpretation

Impaired Glucose Tolerance (IGT)

• 2-hour glucose 140-199 mg/dL indicates IGT

75g OGTT Criteria (ADA)

TimeNormalPrediabetesDiabetes

Fasting< 100100-125≥126

2-hour< 140140-199≥200

Important Note

Diagnosis should be confirmed with repeat testing on a separate day unless unequivocal hyperglycemia is present. Consult a healthcare provider for proper diagnosis.