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    Toxicology Tests



    What Affects the Test

    Reasons the results may not be helpful include:

    • Some drugs that may be mistaken for others. For example, some cough medicines that do not contain Reference narcotics Opens New Window may be identified as a narcotic.
    • Drinking or eating some types of food (such as a food containing poppy seeds).
    • Having blood in the urine.
    • The amount of time between taking the drug and collecting the sample.
    • Not having a large enough urine sample.

    Many medicines may change the results of this test. Be sure to tell your doctor about all the nonprescription and prescription medicines you take.




    By: Reference Healthwise Staff Last Revised: Reference November 8, 2011
    Medical Review: Reference E. Gregory Thompson, MD - Internal Medicine
    Reference R. Steven Tharratt, MD, MPVM, FACP, FCCP - Pulmonology, Critical Care Medicine, Medical Toxicology


    This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Reference Terms of Use. Reference How this information was developed to help you make better health decisions.


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