Fasting For A Blood Test
For some blood tests, patients should not consume any food or drink, as these tests are extremely sensitive to any food consumption. Depending on the test, it may require patients to fast 10 hours to 14 hours. One can have water during fasting, for some tests even black coffee and tea can be taken. If the patient is on a medication, he can continue to do so for most of the tests, but for some tests, he should not have them, so it is always a smart idea to consult a physician or the laboratory.
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American Heart Association
Centers for Disease Control and Prevention
Confidential Blood Tests Online
National Heart Lung and Blood Institute
U.S. National Library of Medicine