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Two to three days after getting a tuberculin skin test, the size of any bump at the site is measured. 1  Positive, meaning you have been infected with TB bacteria.  Negative, meaning you have not been infected with TB bacteria or your body cannot respond to the protein injected because of a weakened immune system.
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: