Disease: Tuberculosis Skin Test
(PPD Skin Test)

    Tuberculosis skin test facts

    • The tuberculosis skin test is also known as the tuberculin test or PPD test.
    • The PPD test is used to determine if someone has developed an immune response to the bacterium that causes tuberculosis (TB).
    • The standard recommended tuberculin test is the Mantoux test, which is administered by injecting a 0.1 mL volume containing 5 TU (tuberculin units) PPD into the top layers of skin of the forearm.
    • Skin tests should be read 48-72 hours after the injection.
    • The basis of the reading of the skin test is the presence or absence and the amount of induration (localized swelling).
    • A negative test does not always mean that a person is free of tuberculosis.
    • A person who received a BCG vaccine (administered in some countries but not the U.S.) against tuberculosis may also have a positive skin reaction to the TB test.

    Source: http://www.rxlist.com

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