The skin test reaction should be read between 48 and 72 hours after administration.The TST is an intradermal injection of 0.1 ml of tuberculin (PPD) on the inner surface of the forearm.
Injecting tuberculin Source: Centers for Disease Control and Prevention Note: to remove the watermark on the document, click on the document's footer then click on the watermark text. Includes guidance for administration, reading, and interpreting TSTs. Tuberculin Skin Testing (TST) Protocol for Screening Health Care Workers (Word).Tuberculin Skin Testing (TST): Storage of Tuberculin and Need for Orders to Administer (PDF).
Disregard BCG history when interpreting TST results. People who have been vaccinated with Bacille Calmette-Guérin (BCG) should not be exempted from TB skin testing unless they have a documented positive result from a prior test. The preferred term for the test is tuberculin skin test, or TST. Tuberculin (also called purified protein derivative or PPD) is the solution used to administer the test. Mantoux refers to the technique for administering the test. The terms Mantoux, TB skin test, tuberculin skin test, and PPDs are often used interchangeably. Tuberculin skin tests (TST) are administered to detect the presence of Mycobacterium tuberculosis, the bacterium that causes tuberculosis (TB).
