You may also like. Putting an end to postpartum depression. New kind of health care center opens in Bryan. Subscribe Today Stay up-to-date on the latest heath care topics. You should avoid coffee and gum before a fasting lab test because both substances affect your digestive system and can change the results of your test. You should also avoid alcohol, smoking and exercise. If you take medications, continue taking them as normal unless your doctor says otherwise.
Food and drinks can affect your results because sugar, fats, enzymes, minerals and cholesterol all absorb into your blood stream. Affected results could then lead to an inaccurate diagnosis.
If you forget and eat or drink something, call your doctor or lab and ask if the test can still be done. They can then tell you if you need to reschedule your test. Here are some examples:. If you are doing the laboratory test in order to measure the level of the medication in your body with the purpose of adjusting the dosage, such as Lithium Camcolit , Valproic acid Depakin , Carbamazepin Tegretol , Lamotrigine Lamictal , Topiramate Topamax or Phenytoin Epanutin , then you should take your medicine hrs before the test.
If your test consists of a bacteriological culture, then you should not be taking antibiotics for at least 5 days before the culture is performed unless your physician insists on doing the culture anyway. Fasting means that you eat and drink nothing except water for 8 —16 hours before your blood test 12 hours optimal.
Your doctor will advise if you are required to fast for your blood test. For more information, please telephone Patient Services Support on
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