The PPD skin test is a method used to diagnose tuberculosis. PPD stands for purified protein derivative.
Alternative Names:
Purified protein derivative standard; TB skin test; Tuberculin skin test
How the test is performed:
The test site (usually the forearm) is cleansed. The PPD extract is then injected under the top layer of skin, causing a blister to form on the skin.
The reaction will take 48 - 72 hours to develop. You must return to your health care provider within that time to have the area checked. This will determine whether you have had a significant reaction to the PPD test. A reaction is measured in millimeters of hard swelling (induration) at the site.
How to prepare for the test:
There is no special preparation for this test.
Tell your health care provider if you have ever had a positive PPD skin test. If so, you should not have a repeat PPD test.
Tell your doctor if you have a medical condition or if you take certain drugs, such as steroids, that can affect your immune system. These situations may lead to inaccurate test results.
How the test will feel:
You will feel a brief sting as a needle is inserted just below the skin surface.
Review Date: 6/8/2007
Reviewed By: Mark Levin, M.D., Division of Infectious Disease, MacNeal Hospital, Berwyn, IL. Review provided by VeriMed Healthcare Network.
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