Tuberculin Skin Testing

Page last updated 8/19/2024

What is Tuberculin Skin Testing?

The Mantoux tuberculin skin test (TST) is the standard method of determining whether a person is infected with Mycobacerium tuberculosis. Reliable administration and reading of the TST requires standardization of procedures, training, supervision and practice.

How is the TST Administered?

The TST is performed by injecting 0.1 ml of tuberculin purified protein derivative (PPD) into the inner surface of the forearm. The injection should be made with a tuberculin syringe, with the needle bevel facing upward. The TST is an intradermal injection. When placed correctly, the injection should produce a pale elevation of the skin (a wheal) 6 to 10 mm in diameter.

How is the TST Read?

The skin test reaction should be read between 48 and 72 hours after administration. A patient who does not return within 72 hours will need to be rescheduled for another skin test.

TB skin testing is done on a walk-in basis on Mondays, Tuesdays, Wednesdays, and Fridays from 8:00 am to 12:00 pm. 
 

Tuberculin Skin Testing is available Mondays, Tuesdays, Wednesdays, and Fridays from 8:00 am to 12:00 pm. Tuberculin Skin Testing is $28 per test or $55 for a two-step.