how long do i have to fast for a cholesterol test?
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Generally you're required to fast, consuming no food or liquids other than water, for nine to 12 hours before the test. Some cholesterol tests don't require fasting, so follow your doctor's instructions.
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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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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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How long do I have to fast for a blood test? 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.
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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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The combination of total cholesterol and HDL cholesterol is very useful for screening for the risk of heart disease since it is not necessary to fast for these two tests. In contrast, a more complete lipid profile requires fasting for about 12 hours.
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Your doctor will recommend which blood tests you should have and how often. Generally, if your cholesterol is normal, you can repeat this test every five years. However, you should be tested annually if you have unhealthy levels or if you have a family history of heart disease or high cholesterol.
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However, if the test is drawn as part of a total lipid profile, it requires a 12-hour fast (no food or drink, except water). For the most accurate results, wait at least two months after a heart attack, surgery, infection, injury or pregnancy to check HDL levels.
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fasting – you need to fast four to six hours prior to your test. other tests – you may undergo various tests before the angiogram, including blood tests, an electrocardiogram and chest x-ray and cardiac CT (computed tomography).
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A high reading may indicate liver disease, bile duct problems, or alcohol abuse. Your doctor may ask you to fast for at least 8 hours beforehand. You also may need to avoid alcohol and some prescription drugs the day before the test because they can affect GGT levels.
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Tell your doctor about any prescription or over-the-counter medications or supplements you're taking. You may need to fast (refrain from eating or drinking) for four hours before the test.
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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.
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Getting your cholesterol levels tested is an important part of keeping your heart and blood vessels healthy. In general, fasting before your test isn't required. But your doctor may recommend fasting if you're already taking a cholesterol medication. Be sure to ask your doctor before your test whether you need to fast.
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You usually need to fast for 8–12 hours before a test.
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For a gallbladder ultrasound, your doctor may request you eat a fat-free meal the day before the test and then fast for 8 to 12 hours leading up to the exam.
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Common fasting blood tests 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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After starting a statin, it takes about six weeks for cholesterol levels to stabilise, so most doctors would re-check your cholesterol after about eight weeks. You should have a check-up at least once a year or more often if your doctor thinks it is necessary.