can you drink water during glucose test

Yes, you can drink water during a glucose test, but you should not eat or drink anything else. Before the test, you may be instructed to fast and only drink water for 8 to 14 hours. During the glucose tolerance test, sips of water are usually allowed, but no other food or drink should be consumed until the test is complete. Drinking water may also help make blood draws easier. Different types of glucose tests (such as the initial glucose screening test or the longer glucose tolerance test) have slightly different instructions, but the common guidance is that water is allowed during the fasting and testing periods, while other food or beverages are not permitted until after the test finishes.