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Results
By Mayo Clinic staffResults of the glucose challenge test are given in milligrams per deciliter (mg/dL) or millimoles per liter (mmol/L).
One hour after drinking the glucose solution:
- A blood sugar level below 140 mg/dL (7.8 mmol/L) is usually considered normal
- A blood sugar level of 140 mg/dL (7.8 mmol/L) or higher may indicate gestational diabetes
Some clinics or labs use a lower threshold of 130 mg/dL (7.2 mmol/L) when screening for gestational diabetes.
If the results of your glucose challenge test indicate the possibility of gestational diabetes, your health care provider will do another blood test — typically the glucose tolerance test, which is done over the course of two to three hours — to confirm the diagnosis.
- Jovanovic L. Screening and diagnosis of gestational diabetes mellitus. http://www.uptodate.com/home/index.html. Accessed May 3, 2010.
- Tan PC, et al. The 50-g glucose challenge test and pregnancy outcome in a multiethnic Asian population at high risk for gestational diabetes. International journal of gynecology and obstetrics. 2009;105:50.
- Lamar ME, et al. Jelly beans as an alternative to a fifty-gram glucose beverage for gestational diabetes screening. American Journal of Obstetrics and Gynecology. 1999;181:1154.
- Position statement: Standards of medical care in diabetes — 2010. Diabetes Care. 2010;33:S11.
- What is gestational diabetes? American Diabetes Association. http://www.diabetes.org/gestational-diabetes.jsp. Accessed May 4, 2010.
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