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Table 3 Comparison of QFT-G and TST results in TB patients and controls with origin from country with intermediate or high TB incidence (n = 150).

From: Use of a T cell interferon gamma release assay in the investigation for suspected active tuberculosis in a low prevalence area

  TB-patients*
n = 52
Controls
n = 98
Positive predictive value Negative predictive value
QFT-G positive 33 10   
QFT-G negative 16 86 76.7% 84.3%
QFT-G indeterminate 3 2   
TST ≥ 10 mm 31 39   
TST <10 mm 3 46 44.3% 93.9%
TST not performed 18 13   
  1. QFT-G: QuantiFERON®-TB Gold; TST: Tuberculin skin test
  2. * Bacteriological and/or clinical diagnosis