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An oral glucose tolerance test (OGTT) measures how well your body uses sugar (glucose). It can be used to find prediabetes and diabetes. It's done most often to screen for diabetes during pregnancy (gestational diabetes).
An OGTT may be done to:
You may find it hard to drink the extremely sweet glucose liquid. Some people feel sick after drinking the glucose liquid and may vomit. Vomiting may prevent you from completing the test on that day.
When a blood sample is taken, you may feel nothing at all from the needle. Or you might feel a quick sting or pinch.
You may feel faint from having several blood samples taken in one day. But the amount of blood taken will not cause significant blood loss or anemia.
Follow-up care is a key part of your treatment and safety. Be sure to make and go to all appointments, and call your doctor or nurse advice line (811 in most provinces and territories) if you are having problems. It's also a good idea to keep a list of the medicines you take. Ask your doctor when you can expect to have your test results.
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Current as of: March 1, 2023
Author: Healthwise Staff
Medical Review:Elizabeth T. Russo MD - Internal Medicine & Kathleen Romito MD - Family Medicine
Care instructions adapted under license by your healthcare professional. If you have questions about a medical condition or this instruction, always ask your healthcare professional. Healthwise, Incorporated disclaims any warranty or liability for your use of this information.
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