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Harvard Medical School
Don't eat or drink anything for eight hours before this test. It's also best to stop taking aspirin and other NSAIDs for several days beforehand, to reduce the chances of bleeding should your doctor need to take a biopsy. Ask your doctor if you should avoid taking any other medicines on the day of the test. Because you have to fast for this test, if you have diabetes talk with your doctor about ways to avoid hypoglycemia. If you wear dentures, remove them before the test. Arrange for a ride home because the medicine given for this test will make you drowsy.