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. When you eat and drink normally, those foods and beverages are absorbed into your bloodstream. That . Mar 22, · Fasting before certain blood tests is important to help make sure that your test results are accurate. The vitamins, minerals, fats, carbohydrates, and proteins that make up Author: Corey Whelan.
With certain blood tests, you may be instructed to fast for up to eight hours before your appointment. That could cause your appointment to be rescheduled. Nutrients and ingredients in the food and beverages you consume are absorbed into your bloodstream and could impact factors measured by certain tests.
Fasting improves the accuracy of those tests. Water hydrates your veins. Hydrated veins are easier to find. And that means easier to draw from. Drink plenty of water before having any blood test.
It depends on the test. Fasting for a lab test typically lasts eight hours. Your doctor should give you any special instructions related to your tests, including fasting requirements. Always follow her or his instructions. Glucose testing that checks blood-sugar levels and tests that determine your cholesterol, triglycerides, and high-density lipoprotein HDL levels usually require fasting. Other lab tests may require fasting, which is why you should ask your doctor.
If you think fasting might be a problem, schedule your appointment for the early morning and bring a snack for after the appointment. Unless your doctor says otherwise, take your usual medications. We have more than 2, Patient Service Centers nationwide. Find a location near you. Patient Service Center Locator. See Your Results: MyQuest.
Order Your Own Lab Tests. Pay Your Bill. Frequently Asked Questions. Contact Us. Health Plan Lookup. What to know about fasting before your lab test With certain blood tests, you may be instructed to fast for up to eight hours before your appointment. Why do I have to fast before certain lab tests? How long do I have to fast for a blood test? What types of blood tests require fasting? Can I eat what to eat after workout to lose weight at night other types of blood tests?
Can I continue taking medications before a blood test? How soon can I eat after a blood test? Where do I get my blood drawn?
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What types of blood tests require fasting? Glucose testing that checks blood-sugar levels and tests that determine your cholesterol, triglycerides, and high-density lipoprotein (HDL) levels usually require fasting. Other lab tests may require fasting, which is why you should ask your doctor.
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. When you eat and drink normally, those foods and beverages are absorbed into your bloodstream.
That could affect the results of certain types of blood tests. Glucose tests are used to diagnose diabetes. You usually need to fast for 8—12 hours before a test. Most tests that require fasting are scheduled for early in the morning. That way, most of your fasting time will be overnight. Juice, coffee, soda, and other beverages can get in your bloodstream and affect your results. In addition, you should not :. But you can drink water. It's actually good to drink water before a blood test.
It helps keep more fluid in your veins, which can make it easier to draw blood. Ask your health care provider. Most of the time it's OK to take your usual medicines, but you may need to avoid certain medicines, especially if they need to be taken with food. Tell your health care provider before your test. He or she can reschedule the test for another time when you are able to complete your fast.
Be sure to talk to your health care provider if you have any questions or concerns about fasting. You should talk to your provider before taking any lab test. Most tests don't require fasting or other special preparations. For others, you may need to avoid certain foods, medicines, or activities.
Taking the right steps before testing helps ensure your results will be accurate. The medical information provided is for informational purposes only, and is not to be used as a substitute for professional medical advice, diagnosis or treatment.
Please contact your health care provider with questions you may have regarding medical conditions or the interpretation of test results. Fasting for a Blood Test. Why do I need to fast before my blood test? What types of blood tests require fasting? The most common types of tests that require fasting include: Glucose tests , which measure blood sugar. One type of glucose test is called a glucose tolerance test. For this test you will need to fast for 8 hours before test.
When you arrive at the lab or health care facility, you will: Have your blood tested Drink a special liquid containing glucose Have your blood re-tested one hour later, two hours later and possibly three hours later Glucose tests are used to diagnose diabetes.
Lipid tests , which measure triglycerides , a type of fat found in the bloodstream, and cholesterol , waxy, fat-like substance found in your blood and every cell of your body.
How long do I have to fast before the test? Can I drink anything besides water during a fast? In addition, you should not : Chew gum Smoke Exercise These activities can also affect your results. Can I continue taking medicine during a fast? What if I make a mistake and have something to eat or drink besides water during my fast? When can I eat and drink normally again?
As soon as your test is over. You may want to bring a snack with you, so you can eat right away. Is there anything else I need to know about fasting before a blood test? References Allina Health [Internet]. Atlanta: U. Boston: Harvard University; — Ask the doctor: What blood tests require fasting? Washington D. Lipid Panel; [updated Jun 12; cited Jun 15]; [about 2 screens]. Quest Diagnostics; c— For Patients: What to know about fasting before your lab test; [cited Jun 15]; [about 3 screens].
Health Encyclopedia: Cholesterol in the Blood; [cited Jun20]; [about 2 screens]. In the event of a medical emergency, call immediately.
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