do i fast before a blood test?
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It is important that a person has not had anything to eat or drink other than water for 8 to 10 hours before a fasting blood glucose test. Fasting helps ensure that the blood test records an accurate measure of fasting blood sugar levels. The results help a doctor to diagnose or rule out diabetes.
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If your doctor asks you to fast before a blood test, it's to ensure the results of the blood test are as accurate as possible. That's why a fasting blood test usually requires fasting for 8-12 hours before your blood is taken.
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You can eat and drink as normal before some blood tests. But if you're having a "fasting blood test", you will be told not to eat or drink anything (other than water) beforehand.
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These include: Water: It is important to keep drinking plenty of water when fasting to stay hydrated. Water does not affect the results of a blood test and is acceptable to drink when asked to fast.
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For these tests, most hospital departments or radiology practices will ask you to fast (not eat or drink) before your appointment. Fasting for 2–4 hours is common, and it is usually permitted to drink water over this time to avoid dehydration (losing too much water from your body).
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You don't need any special preparations for a calcium blood test or a basic metabolic panel. If your health care provider has ordered more tests on your blood sample, you may need to fast (not eat or drink) for several hours before the test.
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You will usually need to fast (not have any food and only drink water) for between 9 and 12 hours before having this test. Most people have the test in the morning so it doesn't interfere with their day and their meals.
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If your blood sample is being tested only for ferritin, you can eat and drink normally before the test. If your blood sample will be used for other tests, you might need to fast for a time before the test. Your doctor will instruct you.
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Common fasting blood tests Examples of blood tests that require you to fast include: a fasting blood glucose test (used to test for diabetes) – you fast for 8 to 10 hours before the test.
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You can eat and drink normally before most blood tests. For fasting blood tests you need to stop eating and drinking beforehand. Your doctor will tell you for how long.
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Tell your doctor about any prescription or over-the-counter medications or supplements you're taking. You may need to fast (refrain from eating or drinking) for four hours before the test.
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This means that you should consume no food or drink (except plain water) for at least 12 hours before the blood test. Please DO continue to take any prescribed medication with water only. It is possible to perform the blood test if you have not fasted.
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In preparation for the test, a doctor may instruct a person to fast for up to 12 hours before the test. The doctor's office typically receives the results within a day.
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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. That could cause your appointment to be rescheduled.
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How long should you fast before a blood test? The amount of time you need to fast for will vary depending on the test. For most tests, you will be told not to consume anything but water for eight hours leading up to the test. For a few tests, a 12-hour fast may be needed.
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Requirements Prior to the Test Fasting is required for a period of 8-10 hours prior to the test. (No food or fluids such as tea, coffee or fruit juice.) You may have sips of water if you are thirsty. Due to the nature of the test, testing is generally done in the morning.
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You usually need to fast for 8–12 hours before a test.