Overview

The glucose challenge test, also called the one-hour glucose tolerance test, measures your body's response to sugar (glucose). The glucose challenge test is done during pregnancy to screen for gestational diabetes — diabetes that develops during pregnancy.

The test is done in two steps. First you drink a sugary solution. One hour later, your blood sugar level is measured. The results indicate whether you might have gestational diabetes.

If the test results are outside the standard range, you might need further testing to determine the diagnosis.