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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.
A health practitioner will interpret a tuberculin skin test result by looking at the injection site on the person's forearm at 48 or 72 hours (in most cases). A positive result will form a red and swollen circle at the site of the injection.