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Table 2 Relationship between the tuberculin skin test results and erythema

From: Value of the tuberculin skin testing and of an interferon-gamma release assay in haemodialysis patients after exposure to M. tuberculosis

  TST (+) TST(−) erythema (+) TST (−) erythema (−)
TST-1 3 3* 46
TST-2 8 9 32
  1. TST-1: Tuberculin skin test result in the first-step testing.
  2. TST-2: Tuberculin skin test result in the second-step testing (15 days after TST-1).
  3. * The three patients with a negative TST-1 result and erythema boosted to a positive TST-2 result.