how many hours do you have to fast before getting blood work?
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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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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. That could cause your appointment to be rescheduled.
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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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For a fasting blood glucose test, you can't eat or drink anything but water for eight hours before your test. You may want to schedule a fasting glucose test first thing in the morning so you don't have to fast during the day.
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Fasting (except water) is required for 10 to 12 hours before the test. How the test will feel: When the needle is inserted to draw blood, some people feel moderate pain, while others feel only a prick or stinging sensation. Afterward, there may be some throbbing.
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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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A quick guide to fasting Fasting means that you abstain from all food and fluids other than water for a period of 8-14 hours prior to your test.
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#13 – Fast 24 Hours Before Your Exam You can get the most accurate results by fasting for about 24 hours before the exam. That way, you don't throw numbers off by having a blood sugar spike or increased blood pressure due to an unhealthy meal.
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This test requires a 12-hour fast. You should wait to eat and/or take a hypoglycemic agent (insulin or oral medication) until after test has been drawn, unless told otherwise. Eating and digesting foods called carbohydrates forms glucose (blood sugar).
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Fasting means you don't eat or drink anything but water usually for 8 to 12 hours beforehand. So, if your appointment is at 8 a.m. and you're told to fast for 8 hours, only water is okay after midnight. If it's a 12-hour fast, avoid food and drink after 8 p.m. the night before.
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Fasting before blood tests Fasting means that you eat and drink nothing except water for 8 –16 hours before your blood test (12 hours optimal).
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an iron blood test (used to diagnose conditions such as iron deficiency anaemia) – you fast for 12 hours before the test.
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You should fast for up to 8 hours before having your blood glucose measured to check for diabetes or to see how well treatments are working. An alternative test for glucose level that does not require fasting measures a substance called haemoglobin A1c, which reflects average blood sugar over the previous 3 months.
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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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How often and when should I test? You may need to test your blood several times a day. Generally, these times are fasting (first thing in the morning before you eat) and 2 hours after each meal. Occasionally, you may be asked to test more frequently during the day or at night.
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a fasting blood glucose test (used to test for diabetes) – you fast for 8 to 10 hours before the test. an iron blood test (used to diagnose conditions such as iron deficiency anaemia) – you fast for 12 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.