Glucose Tolerance Test

Prior to a glucose tolerance test being performed, the initial 1-hour test is called a glucose challenge test. If the results are abnormal, then a glucose tolerance test is done.

A glucose tolerance test, usually conducted in the 24 to 28 weeks of pregnancy, measures levels of sugar (glucose) in the mother's blood. Abnormal glucose levels may indicate gestational diabetes.

The glucose tolerance test is performed if the woman has an elevated 1-hour glucose challenge test.

Although the specific details of each procedure vary slightly, generally, a glucose tolerance test follows this process:

  • The mother-to-be may be asked to only drink water on the day the glucose tolerance test is given.

  • An initial fasting sample of blood is drawn from a vein.

  • You will be given a special glucose solution to drink.

  • Blood will be drawn several times over the course of several hours to measure the glucose levels in your body.

If you have questions regarding the glucose tolerance test, call (314) 996-5433 or email us to speak with a doctor.