how long do i fast before a pet scan?
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Follow a special diet for 12 to 24 hours before the scan. Don't drink or eat anything, except water, for 6 hours before the scan.
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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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For a fasting blood glucose test, you can't eat or drink anything but water for eight hours before your test.
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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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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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Because PET scans read your sugar metabolism, eating sugar could affect the results of your scan. It's also important that you don't exercise for 24 hours before your PET scan. That's because exercise affects the radiotracer's reading and could cause the results to be inaccurate.
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If your exam includes an IV injection of a contrast dye, you will be asked not to eat or drink anything for three hours before your exam. You can drink clear liquids, unless you are on restricted fluids. Not all scans use a contrast dye. Its use depends on which parts of the body the scan is being used to analyze.
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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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1 hour before your appointment empty your bladder and drink rapidly (within 5-10 min) 1 liter of water. Finish drinking 50-55 min before the scan to allow enough time for the bladder to fill. Do not empty your bladder again until after the scan.
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A typical PET scan diet is as follows: 12 hours before your appointment: You will be asked to eat a low carbohydrate diet. Foods that can be eaten include: meat, hard cheese, tofu, eggs, butter and vegetables with no starch.
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Food and medications Your doctor is likely to ask you: To fast for four hours before your HIDA scan. You might be allowed to drink clear liquids.
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Preparation for the Procedure You will be asked to follow the Limited Carbohydrate diet for the previous 24 hours before the date of your appointment. Do not eat or drink anything, except water, for 6 hours before the exam.
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Fast facts on HIDA scans: They are done to get images of the liver, gallbladder, bile ducts and small intestine. To prepare for a HIDA scan, a person may need to fast for 4 to 12 hours before the scan. Women who are pregnant or breast-feeding should tell their doctor.
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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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Your doctor will usually tell you to fast for 8 to 12 hours before your ultrasound. That's because undigested food in the stomach and urine in the bladder can block the sound waves, making it difficult for the technician to get a clear picture.
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You should not eat or drink anything for six (6) hours before your exam. You should empty your bladder before beginning this exam so that you will be as comfortable as possible during the procedure. There are no other preparations necessary for you to do before this test.
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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.