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Patients and the Laboratory
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fastingbloodcollectionguidelines
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Pathology and Laboratory Medicine
Specimen Collection Guidelines
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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.
QUESTION
ANSWER
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.
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Last Modified:
Friday, June 1, 2018
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