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Table 4 QuantiFERON-TB Gold (QFT-TB) results in the overall group of patients with a positive tuberculin skin test (≥ 6 mm) and in various TST subgroups

From: Diagnosis and follow-up of treatment of latent tuberculosis; the utility of the QuantiFERON-TB Gold In-tube assay in outpatients from a tuberculosis low-endemic country

TST Positive QFT-TB
Induration (mm) No (% of total) No (% of TST group)
≥ 6 398 (82.7) 127 (31.9)
0-5 37 (7.7) 1 (2.7)2
6-10 105 (21.8) 11 (10.5)
11-14 89 (18.5) 19 (21.3)
≥ 15 204 (42.4) 97 (47.5)3
No TST1 46 (9.6) 20 (43.5)
  1. TST = tuberculin skin test. 1) Not tested due to previous strong response. 2) Previous tuberculosis, 3) p < 0.001 compared to the other TST groups.