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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.