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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.
Place the zero ruler line inside the left dot edge and read the ruler line inside the right dot edge. If the measurement falls between the two divisions on the millimeter scale, record the lower mark. If unsure, ask a co-worker. Note: Reactions to the tuberculin skin test at the injection site will vary.