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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.
Mantoux Test. The Mantoux skin test is given by using a needle and syringe to inject 0.1 ml of 5 tuberculin units of liquid tuberculin between the layers of the skin (intradermally), usually on the forearm (Figure 1). A tuberculin unit is a standard strength of tuberculin.The tuberculin used in the Mantoux skin test is also known as purified protein derivative, or PPD. For this reason, the tuberculin skin test is sometimes called a PPD skin test.With the Mantoux skin test, the patient's arm is examined 48 to 72 hours after the tuberculin is injected. Most people with TB infection have a positive reaction to the tuberculin.hether a reaction to the Mantoux tuberculin skin test is classified as positive depends on the size of the induration and the person's risk factors for TB (see Table 1). An induration of 5 or more millimeters is considered a positive reaction for the following people: