The Mantoux test (or Mantoux screening test, Tuberculin Sensitivity Test, Pirquet test, or PPD test for Purified Protein Derivative) is a diagnostic tool for tuberculosis.
Mantoux Test Procedure
A standard dose of 10 Tuberculin units (0.2 ml) is injected intradermally (into the skin) and read 48 to 72 hours later. A person who has been exposed to the bacteria is expected to mount an immune response in the skin containing the bacterial proteins.
The reaction is read by measuring the diameter of induration (palpable raised hardened area) across the forearm (perpendicular to the long axis) in millimeters.
Tuberculin skin testing is not contraindicated for BCG-vaccinated persons.