Glucose tolerance test

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How you prepare

By Mayo Clinic staff

Controlling Your Diabetes

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It's important to eat and drink normally in the days leading up to the glucose tolerance test. Let your doctor know if you're ill or taking any medications, as these factors can affect the results of your test. For eight hours before the test, however, you won't be able to eat or drink anything. You might want to fast overnight and schedule the test for early the following morning.

What you can expect Why it's done
References
  1. American Diabetes Association. Standards of medical care in diabetes — 2013. Diabetes Care. 2013;36(suppl):1.
  2. Evensen AE. Update on gestational diabetes mellitus. Primary Care. 2012;39:83.
  3. Glucose. Lab Tests Online. http://labtestsonline.org/understanding/analytes/glucose/tab/glance. Accessed Dec. 7, 2012.
  4. McCullough DK. Diagnosis of diabetes mellitus. http://www.uptodate.com/index. Accessed Dec. 7, 2012.
  5. The American College of Obstetricians and Gynecologists (committee opinion). Screening and diagnosis of gestational diabetes mellitus. Obstetrics and Gynecology. 2011;118:751.
  6. Castro MR (expert opinion). Mayo Clinic, Rochester, Minn. April 8, 2013.
  7. Coustan DR, Jovanovic L. Screening and diagnosis of diabetes mellitus during pregnancy. http://www.uptodate.com/home. Accessed April 2, 2013.
  8. AskMayoExpert. What tests are needed to confirm the diagnosis of gestational diabetes mellitus during pregnancy? Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2013.
MY00145 April 17, 2013

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