 fasting blood glucose level is normal.
Normal blood values for a 75-gram oral glucose tolerance test used to check for type 2 diabetes in those who are not pregnant:
Note: mg/dL = milligrams per deciliter
The examples above are common measurements for results of these tests. Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your doctor about the meaning of your specific test results.
Higher-than-normal levels of glucose may mean you have prediabetes, diabetes, or gestational diabetes.
Between 140 - 200 mg/dL is called impaired glucose tolerance. Your doctor may call this "prediabetes." It means you are at increased risk for developing diabetes.
A glucose level of 200 mg/dL or higher is a sign of diabetes.
However, high glucose levels may be related to another medical problem (for example, Cushing syndrome).
Veins and arteries vary in size from one patient to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.
Other risks associated with having blood drawn are slight but may include:
Factors that may affect the test results:
Several drugs may cause glucose intolerance, including:
Before having the test, let your health care provider know if you are taking any of these medications.
Oral glucose tolerance test
American Diabetes Association. Standards of medical care in diabetes--2012. Diabetes Care. 2011 Jan;35 Suppl 1:S11-63.
Buse JB, Polonsky KS, Burant CF. Type 2 diabetes mellitus.In: Melmed S, Polonsky KS, Larsen PR, Kronenberg HM, Larsen PR, eds. Williams Textbook of Endocrinology. 12th ed. Philadelphia, Pa: Saunders Elsevier;2011:chap 31.
Inzucchi SE, Sherwin RS. Type 2 diabetes mellitus. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, PA: Saunders Elsevier; 2011:chap 237.
Updated by: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc.
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