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Your doctor will probably screen you for gestational diabetes between your 24th and 28th weeks of pregnancy. If you have certain risk factors (see Who's at Risk? below), your doctor may opt to screen you sooner. During your screening, you'll drink a sugary liquid, then take a blood test. If your blood sugar levels appear high, you'll need to take a longer test, during which you'll drink more liquid and your blood sugar will be tested several times to determine whether you have gestational diabetes.
The idea is to see how efficiently your body processes sugar. The results should be available in a few days. If the reading is too high, which happens 15 to 23 percent of the time, you'll be asked to come back for a three-hour glucose tolerance test to see whether you really do have gestational diabetes. The good news is that most women whose screening test shows elevated blood sugar don't turn out to have gestational diabetes.