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U.S. Department of Health & Human Services

 

The TB skin test, also called the Mantoux tuberculin skin test (TST), requires two visits with a healthcare provider. On the first visit, a test is placed. On the second visit, the test is read.

The TB skin test is done by using a needle and syringe to inject tuberculin between the layers of skin on the forearm.

 

Most people who have TB infection will have a reaction at the injection site. The reaction is the

area of induration (firm swelling).

Tuberculin: A substance made from tubercle bacilli that have been killed by heating - used in testing for TB infection.

Induration: Swelling that can be felt.

Health care worker correctly administering

the Mantoux TST