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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 8 to 12 hours before your...
How long do you have to fast before a blood test? Can you drink water? What about black coffee? Our expert answers questions about fasting before a blood test.
Some blood tests may require you to fast for 8–12 hours beforehand. Check with your doctor for specific instructions, as some tests may have further restrictions.
Some blood tests require you to stop eating and drinking (fasting) several hours before a blood test. Learn how long to fast and what to do if you accidentally eat or drink.
With certain blood tests, you may be instructed to fast for up to eight hours before your appointment. Fasting before a blood draw means you don’t eat or drink anything except water. Don’t wait until the day of your blood draw to ask if you should fast.
Fasting before blood work means you shouldn’t eat or drink anything except water for at least eight hours before a blood test. For some tests, you may need to fast for 12 hours. Ask your health care provider how long to fast before your blood test if you’re unsure.
For certain blood tests, you may need to fast (avoid eating or drinking anything except water) for 9–12 hours beforehand. Your doctor may also ask you to stop taking certain prescription ...
Fasting before a blood test means that a person should not eat or drink anything other than water. Typically, if a blood test requires fasting, doctors schedule it for the morning. This way, a...
Very few blood tests require a period of fasting before the test. They include tests for blood glucose and triglycerides. It is permitted to drink water, coffee, or black tea before the tests.
What is fasting for a blood test? If your health care provider has told you to fast before a blood test, it means you should not eat or drink anything, except water, for several hours before your test. While you're fasting for a blood test, you also should not: Chew gum; Smoke; Exercise