One of several skin tests to determine past or present tuberculosis infection. A purified protein derivative of the tubercle bacilli, called tuberculin, is introduced into the skin by scratch, puncture, or interdermal injection.

Skin test for tuberculosis using tuberculin, a sterile solution containing growth products of Mycobacterium tuberculosis or Mycobacterium bovis.

(tuberculin skin test) A test of delayed-type hypersensitivity involving injection into the skin of a small amount of purified protein derivative (PPD). The formation of a specific, defined amount of induration in response to the test suggests the presence of tuberculosis infection.

(tuberculin skin test) A test to determine if a subject has ever had a tuberculosis infection. A small amount of purified tuberculosis protein is placed under the skin of the forearm and a positive skin reaction indicates previous exposure to Mycobacterium tuberculosis.

Tuberculin test, procedure for the diagnosis of tuberculosis infection by the introduction into the skin, usually by injection on the front surface of the forearm, of a minute amount of purified protein derivative (PPD) tuberculin. Tuberculin is a protein substance from the tuberculosis-causing...