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Two to three days after getting a tuberculin skin test, the size of any bump at the site is measured. 1  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 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 infection is latent (inactive) or is active and can be passed to others. Why It Is Done. A tuberculin skin test is done to find people who have tuberculosis (TB), including: People who have been in close contact with someone known to have TB.