are you supposed to fast before drug test?
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Abstain from any drugs or alcohol. Bring any paperwork that your employer or agency requesting the drug test requires. If you are required to fast before your drug screening, avoid all food and drink for the time-frame designated for 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.
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Requirements Prior to the Test You are to remain on a normal, unrestricted diet for at least 3 days prior to test. You have had no acute significant illness for 2 weeks prior to 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.)
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A. You need to be fasting for 12 hours prior to your test. Nothing to eat, but you can drink all the water you want. It is okay to take your prenatal vitamins, and any other medications that can be taken without food.
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You may be asked not to eat, drink or smoke for a period of time before a stress test. You may need to avoid caffeine the day before and the day of the test.
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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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No. You do not need to fast and you can test your blood any time of the day. It is best to collect the blood sample before eating or several hours after a meal.
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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. Fasting before a blood draw means you don't eat or drink anything except water.
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About Our Comprehensive Metabolic Panel (CMP) Fasting is required for this lab test. You should not consume food or beverages other than water for at least 8 hours prior to visiting the lab. If you choose not to fast, it may affect your results.
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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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Obtain fasting labs (nothing by mouth except water for 8 hours prior to test) 1-2 days prior to monthly visits. If labs are not reviewed in the office, you will be contacted in 2-3 days with your results and prescription information.
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If you are having a vitamin B blood test, you may need to fast (not eat or drink) for several hours before the test. You don't need any special preparations for a urine test.
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How do you prepare for a blood test? 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.
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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.
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Your doctor will probably ask you to fast (not eat) for two to four hours before the scan. You may be asked to stop taking certain medications before your test. You may want to wear loose, comfortable clothing because you'll need to lie down on a procedure table. You may also be given a hospital gown to wear.
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Food and drink before the test may affect the results. Drinking a lot of alcohol within a day or two of the test can cause abnormal results. It's recommended that you avoid alcohol for about 48 hours before the test.
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You may need to fast (not eat or drink) for 8–12 hours before a lipase blood test. If your health care provider has ordered a lipase urine test, be sure to ask if you need to follow any special instructions.