Erythema should be disregarded. The sole criterion for a positive reaction is palpable induration. A negative reaction is indicated by complete absence of induration. A significant reaction to the tuberculin skin test indicates the presence of infection but does not signify disease. The test is only a diagnostic aid in the evaluation of an individual patient.
Descriptive literature illustrating typical reactions is available on request.
In contrast, reported false negative results from multiple puncture tests containing tuberculin dried on the tines has ranged from a low to significant incidence. A multiple puncture test utilizing tuberculin dried on the tines may produce one, two, three or four separate reactions of varying size, or two or more reactions may coalesce. Box of 25 tests. Recommendations of the Advisory Committee for Elimination of Tuberculosis. Screening for tuberculosis and tuberculous infection in high- risk populations.