PPD Skin Test
Alternate Names : Purified Protein Derivative Standard, TB Skin Test, Tuberculin Skin Test
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How is the Test Performed?
The test site (usually the forearm) is cleansed. The PPD extract is then injected into the most superficial layer under the skin resulting in a blister on the skin.
Because the reaction will take 48-72 hours to develop, you must return to your health care provider within that time for a proper evaluation of the test site. This will determine whether you have had a significant reaction to the PPD test. A reaction is measured in millimeters of induration (hard swelling) at the site.
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