Fasting blood test guidelines
Fasting means you should not have anything to eat or drink for a minimum of 10 hours to a maximum of 14 hours before you go to the laboratory.
|May I drink water?||Yes, small amounts.|
|Should I take my medications?||Yes, unless your doctor tells you not to.|
|May I drink juice?||No.|
|May I drink coffee or tea?||No, not even black without sugar.|
|May I chew gum?||No, sorry, not even sugarless.|
|During a tolerance test, may I smoke or exercise?||No, smoking or exercising can influence the tolerance test results.|
|What time should I come to the lab?||Most people find it convenient to stop eating and drinking after |
8 pm and to arrive at the laboratory early the next morning.
|May I brush my teeth?||Yes, brushing your teeth is permitted unless otherwise indicated by your physician, assuming you do not use large amounts of toothpaste and swallow the lather.|
|May I take high dose vitamins and Biotin supplements?||No, high dose vitamins, supplements and biotin preparations interfere with common lab tests (such as thyroid tests). These should be avoided for 48 hours prior to lab testing.|