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Guidelines for Reading the Mantoux Tuberculin Skin Test. NOTE: The results of the skin test must be read by a trained health care worker 48 to 72 hours from the time the test was administered. (Results reported as âpositiveâ or ânegativeâ are. not. acceptable.) Supplies.
Best practice indicates that a two-step tuberculin skin test (TST) involves two tests performed within one to four weeks of each other. The second test can be completed up to one year from the first test, provided there hasnât been an exposure to infectious tuberculosis (TB) disease during that time period.