• if you are asked to fast for your test: —do not eat or drink anything (except water) for 8 hours before you go to the laboratory to have your blood drawn. Webif you are asked to fast for your test: • do not eat or drink anything (except water) for 8 hours before you go to the laboratory to have your blood drawn. If your physician has. Webprepare for your lab test by finding out if you need to fast before bloodwork, which foods to avoid, and if you can drink water the night before a test. Some tests require special preparation. You can see more details on patient preparation for each test here. Webjul 29, 2024 · what are the rules for fasting for a blood test? Avoid any food or drinks, alcohol, smoking, chewing gum, exercising, and some supplements and medications for. The patient should remain seated throughout the test.
