Summary of tuberculin skin test (TST) and interferon-γ release assay (IGRA) results in patients who had at least one immunological test performed
| Patients | QFT positive | QFT negative | QFT indeterminate | T-SPOT positive | T-SPOT negative | T-SPOT indeterminate | No IGRA# | |
| TST cut-off 5 mm¶ | 84 | |||||||
| Positive | 18 (21.4) | 1 (1.2) | 1 (1.2) | 8 (9.5) | 0 | 0 | 24 (28.5) | |
| Negative | 9 (10.7) | 2 (2.4) | 3 (3.6) | 4 (4.8) | 2 (2.2) | 0 | 12 (14.3) | |
| TST cut-off 10 mm | 92 | |||||||
| Positive | 16 (17.4) | 1 (1.1) | 1 (1.1) | 6 (6.5) | 0 | 0 | 22 (23.9) | |
| Negative | 13 (14.1) | 4 (4.3) | 5 (5.4) | 6 (6.5) | 2 (2.2) | 0 | 16 (17.4) | |
| No TST+ | 16 | 9 (56.3) | 1 (6.3) | 3 (18.8) | 2 (12.5) | 1 (6.3) | 0 |
Data are presented as n or n (%). n=108. QFT: QuantiFERON-TB Gold assay; T-SPOT: T-SPOT.TB assay. #: IGRA not performed or result not available; ¶: excludes eight patients who were negative at the 10-mm cut-off, but had no quantitative result recorded; +: TST not performed or result not available.