The TB skin test is also called the Mantoux tuberculin skin test (TST). A TB skin test requires two visits with a health care provider.
On the first visit the test is placed; on the second visit the health care provider reads the test.

• The TB skin test is performed by injecting a small amount of fluid (called tuberculin) into the skin on the inner surface of the forearm.
• A person given the tuberculin skin test must return within 48 to 72 hours to have a trained health care worker look for a reaction on the arm.
• The result depends on a person's reaction to the tuberculin.