Doctors use different types of screening tests
. Many doctors use a two-step approach, starting with the glucose challenge test. This test determines your likelihood of having the disorder.
Glucose challenge test
You don’t need to do anything to prepare for this test. You can eat and drink normally beforehand. When you arrive at your doctor’s office, you’ll drink a syrupy solution that contains glucose
. One hour later, you’ll take a blood test
. If your blood sugar is high, your doctor will schedule a glucose tolerance test.
Glucose tolerance test
measures your body’s response to glucose. It’s used to determine how well your body handles glucose after a meal. Your doctor will ask you to fast overnight to prepare for this test. Ask your doctor if you can sip water during this time. You should remind your doctor of any medications you’re taking and ask if you should stop them during this time. The test is then performed as follows:
- After arriving at your doctor’s office, your doctor measures your fasting blood sugar.
- Afterward, you drink an 8-ounce glass of glucose solution.
- Your doctor measures your glucose levels once per hour for the next three hours.