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    Measurement of a Tuberculin Skin Test Reaction

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    Two to three days after getting a tuberculin skin test, the size of any bump at the site is measured. Your risk of having TB is used along with the size of the bump to determine whether the test is:

    • Positive, meaning you have been infected with TB bacteria.
    • Negative, meaning you have not been infected with TB bacteria or your body cannot respond to the protein injected because of a weakened immune system.

    The test cannot tell if you have a latent (inactive) infection or an active infection that can be spread to others.

    ByHealthwise Staff
    Primary Medical ReviewerE. Gregory Thompson, MD - Internal Medicine
    Specialist Medical ReviewerR. Steven Tharratt, MD, MPVM, FACP, FCCP - Pulmonology, Critical Care Medicine, Medical Toxicology

    Current as ofNovember 14, 2014

    WebMD Medical Reference from Healthwise

    Last Updated: November 14, 2014
    This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.

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