how many hours should you fast before getting blood work done?
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You usually need to fast for 8–12 hours before a test.
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If fasting is required, you should not have anything to eat or drink (with the exception of water) for 10–12 hours before your test. Unless advised by your doctor, you should take all regular medication.
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It depends on the test. Fasting for a lab test typically lasts eight hours. Your doctor should give you any special instructions related to your tests, including fasting requirements. Always follow her or his instructions.
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You may be instructed not to eat or drink anything except water for 9 to 12 hours before having your blood drawn. This is called a "fasting blood test." Fasting is not always necessary, but it may be recommended.
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Patient Instructions If your doctor has requested that a fasting blood test be performed, fasting is generally overnight. 12 hours is the optimal fasting period. Fasting longer than the recommended time could compromise your results. You may be advised to defer the test to another day.
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That's why a fasting blood test usually requires fasting for 8-12 hours before your blood is taken. It's also recommended that you avoid alcohol for 24 hours before your fasting blood test, as well as any strenuous exercise.
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For this test you will need to fast for 8 hours before test. When you arrive at the lab or health care facility, you will: Have your blood tested. Drink a special liquid containing glucose.
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Your doctor may recommend fasting before having your cholesterol checked. If they say you should fast, they'll likely suggest that you avoid eating for 9 to 12 hours before your test.
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You may be instructed not to eat or drink anything except water for 9 to 12 hours before having your blood drawn. This is called a "fasting blood test." Fasting is not always necessary, but it may be recommended. Usually, you are allowed to take your medicines with water the morning of 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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Fasting for a lab test typically lasts eight hours. Your doctor should give you any special instructions related to your tests, including fasting requirements.
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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. You may eat and drink before a random glucose test.
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For these blood glucose tests used to diagnose diabetes, you must fast at least 8 hours before you have your blood drawn. If you have symptoms of diabetes, your doctor may use the random plasma glucose test, which doesn't require fasting.
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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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Fasting means that you abstain from all food and fluids other than water for a period of 8-14 hours prior to your test. Alcohol should not be consumed for 72 hours (3 days) prior to the test. You should avoid smoking during the fasting period. Do not fast for more than 14 hours prior to your testing.
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Should the patient fast before the appointment? For a physical, my staff advises patients to fast eight hours prior to the appointment for the bloodwork. Water and a cup of black coffee is fine if you usually drink it in the morning, though.
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Fasting for a lab test typically lasts eight hours. Your doctor should give you any special instructions related to your tests, including fasting requirements. Always follow her or his instructions.