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Table 4 Agreement between the results of tuberculin skin testing and presence of erythema with those for the Quantiferon-TB Gold in-tube assay

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

  TST/Erythema
    TST (−) Erythema (−) TST (+) or erythema (+) Total
QFT negative n 29 5 34
   % 55.8% 9.6% 65.4%
positive n 3 15 18
  % 5.8% 28.8% 34.6%
total n 32 20 52
  % 61.5% 38.5% 100`
kappa value 0.67
  1. TST: Tuberculin Skin Test.
  2. QFT: Quantiferon®-TB Gold in-Tube assay.