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)