Glucose tolerance test

Injury	Disease	Nutrition	Poison

Symptoms	Surgery	Test	Special Topic

Urine sample

Fasting glucose tolerance test

Oral glucose tolerance test

Overview

Risks

Results

Glucose tolerance test

Alternative Names:

Oral glucose tolerance test

Normal Values:

For a 75-gram oral glucose tolerance test used to check for type 2 diabetes, normal (nondiabetic) blood values are:

fasting: 60 to 110 mg/dL
1 hour: less than 200 mg/dL
2 hours: less than 140 mg/dL. Between 140-200 mg/dL is considered impaired glucose tolerance or pre-diabetes. This group is at increased risk for developing diabetes. Greater than 200 mg/dL is diagnostic of diabetes mellitus

For a 50-gram oral glucose tolerance test used to screen for gestational diabetes, normal blood values at 1 hour are less than 140 mg/dL.

For a 100-gram oral glucose tolerance test used to screen for gestational diabetes, normal blood values are:

fasting: less than 95 mg/dL
1 hour: less than 180 mg/dL
2 hour: less than 155 mg/dL
3 hour: less than 140 mg/dL

Note: mg/dL = milligrams per deciliter

What abnormal results mean:

Greater than normal levels of glucose may indicate

High glucose levels may be related to another clinical problem (for example, Cushing's syndrome).

Review Date: 8/12/2004
Reviewed By: Aniket R. Sidhaye, M.D., Division of Endocrinology and Metabolism, Johns Hopkins University School of Medicine, Baltimore, MD. Review provided by VeriMed Healthcare Network.

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