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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.
1 The PPD test is used to determine if someone has developed an immune response to the bacterium that causes tuberculosis (TB). 2  The standard recommended tuberculin test is the Mantoux test, which is administered by injecting a 0.1 mL volume containing 5 TU (tuberculin units) PPD into the top layers of skin of the forearm. A negative test does not always mean that a person is free of tuberculosis. 2  A person who received a BCG vaccine (administered in some countries but not the U.S.) against tuberculosis may also have a positive skin reaction to the TB test.