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Tuberculin Skin Test A tuberculin skin test is done to see if
you have ever had tuberculosis (TB). The test is done by putting
a small amount of TB protein (antigens) under the top layer of
skin on your inner forearm. If you have ever been exposed to the
TB bacteria (Mycobacterium tuberculosis), your skin will react
to the antigens by developing a firm red bump at the site within
2 days. The TB antigens used in a tuberculin skin test are
called purified protein derivative (PPD). A measured amount of
PPD in a shot is put under the top layer of skin on your
forearm. This is a good test for finding a TB infection. It is
often used when symptoms, screening, or testing, such as a chest
X-ray, show that a person may have TB. A tuberculin skin test
cannot tell how long you have been infected with TB. It also
cannot tell if the inf