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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. Don’t wait until the day of your blood draw to ask if you should fast.
Fasting blood glucose measures the amount of glucose (sugar) in your blood to test for diabetes or prediabetes. Typical fasting time: At least 8 hours. Lipid profile is used to check the level of cholesterol and other blood fats. High levels put you at risk for developing heart disease or having a stroke.
Some tests, such as a fecal occult blood test, don’t require fasting but do limit certain foods. Red meats, broccoli, and even some medications may cause a false positive test.
Fasting Instructions for Blood Test While fasting, specifically when it's for cholesterol and triglyceride screening,... You can drink small amounts of water, but avoid fruit juices, tea,... If you have any regular medication that has to be taken, you can ask your doctor if it is allowed. Chewing ...
Generally, fasting is not required for a cortisol blood test. Since cortisol is released in response to stress, it is a usual advise by doctors to remain stress-free when reporting for the test. You may be advised to withhold certain medications, health supplements , and herbal medicines before planning for the test.
If your health care provider has told you to fast before a blood test, it means you should not eat or drink anything, except water, for several hours before your test. When you eat and drink normally, those foods and beverages are absorbed into your bloodstream.