how long do you have to wait to eat before blood work?
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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.
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Do not eat, drink, smoke, or exercise strenuously for at least 8 hours before your first blood sample is taken. Tell your doctor about all prescription and nonprescription medicines you are taking. You may be instructed to stop taking certain medicines before the test.
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You usually need to fast for 8–12 hours before a test.
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If a fasting glucose (FBS), LDL, or Triglycerides test is ordered for you do not eat anything 8 to 12 hours before coming into the laboratory to have blood samples collected. You may drink water and take any prescription medications, but nothing else by mouth. No coffee or tea.
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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. You may also be told not to smoke before your test.
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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. 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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Some blood tests will require you to fast beforehand. In these cases, your doctor will instruct you not to eat or drink anything, except water, in the hours leading up to the test. Fasting before certain blood tests is important to help make sure that your test results are accurate.
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DO NOT EAT OR DRINK 4 HOURS BEFORE YOUR TEST. (This includes gum and breath mints.) DIABETIC MEDICATIONS should not be taken the morning of your test, but please bring your diabetic medicines with you.
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How long do I have to fast before the test? You usually need to fast for 8–12 hours before a test. Most tests that require fasting are scheduled for early in the morning.
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Before donation The first and most important rule—never donate blood on an empty stomach. “Eat a wholesome meal about 2-3 hours before donating to keep your blood sugar stable," says Dr Chaturvedi. The timing of the meal is important too. You need to allow the food to be digested properly before the blood is drawn.
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You may not eat or drink anything for 8 to 10 hours before the test. If you eat, the gallbladder and ducts will empty to help digest food and will not be easily seen during the test.
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If your blood sample is being tested only for a complete blood count, you can eat and drink normally before the test. If your blood sample will be used for additional tests, you may need to fast for a certain amount of time before the test.
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The blood can be taken by your doctor or at a pathology lab. There is no need to fast before the test – you can eat and drink as normal. The results should be available within 24 hours.
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Some blood will usually be taken from your arm with a needle. This is sent to a lab to check your cholesterol level. You should get the result in a few days. You might be asked not to eat anything for up to 12 hours before the test.
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In the morning, take your blood pressure before eating, as digesting food can lower your blood pressure. If you must eat first, wait 30 minutes after eating before taking a measurement.
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Meals. In the morning, take your blood pressure before eating, as digesting food can lower your blood pressure. If you must eat first, wait 30 minutes after eating before taking a measurement.
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You will drink a sugary liquid one hour before your blood is drawn. You won't need to fast for this test. If your results show higher than normal blood glucose levels, you may need another test, which requires fasting.