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Oral Glucose Tolerance Test

Results continued...

You have prediabetes if the results of your oral glucose tolerance test are 140 to 199 mg/dL (2 hours after the beginning of the test).

High values

High glucose levels may be caused by:

Low values

Low glucose levels may be caused by:

Many conditions can change blood glucose levels. Your doctor will discuss any significant abnormal results with you in relation to your symptoms and past health.

What Affects the Test

Reasons you may not be able to have the test or why the results may not be helpful include:

  • Smoking.
  • Taking certain medicines, such as corticosteroids, diuretics, seizure medicines, birth control pills, nonsteroidal anti-inflammatory drugs (NSAIDs), and some medicines used to treat high blood pressure.
  • Alcohol.
  • Recent surgery, illnesses, and infectious diseases.
  • Weight loss through dieting.
  • Long periods of bed rest (such as from a hospitalization or illness).

What To Think About

If you are diagnosed with gestational diabetes, you have a higher risk of developing diabetes later in life. The American Diabetes Association recommends screening for diabetes and prediabetes every 3 years.2

Citations

  1. American Diabetes Association (2012). Diagnosis and classification of diabetes mellitus. Diabetes Care, 35(Suppl 1): S64–S71.

  2. American Diabetes Association (2013). Standards of medical care in diabetes—2013. Diabetes Care, 36(Suppl 1): S11–S66.

Other Works Consulted

  • Chernecky CC, Berger BJ (2013). Laboratory Tests and Diagnostic Procedures, 6th ed. St. Louis: Saunders.

  • Fischbach FT, Dunning MB III, eds. (2009). Manual of Laboratory and Diagnostic Tests, 8th ed. Philadelphia: Lippincott Williams and Wilkins.

  • Pagana KD, Pagana TJ (2010). Mosby’s Manual of Diagnostic and Laboratory Tests, 4th ed. St. Louis: Mosby.

By Healthwise Staff
Primary Medical Reviewer E. Gregory Thompson, MD - Internal Medicine
Specialist Medical Reviewer Alan C. Dalkin, MD - Endocrinology
Last Revised July 5, 2011
1 | 2 | 3

WebMD Medical Reference from Healthwise

Last Updated: July 05, 2011
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.

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