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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.
The two-step tuberculin skin test (TST) is used to detect individuals with past tuberculosis (TB) infection who now have diminished skin test reactivity. This procedure will reduce the likelihood that a boosted reaction is later interpreted as a new infection.