Table 2.
Screening outcomes for latent tuberculosis infection before anti-TNF agent
| n = 376, n (%) | |
| Chest X-ray | |
| Done | 356 (94.7) |
| Old tuberculosis | 8/356 (2.2) |
| Negative | 348/356 (97.8) |
| IGRA | |
| Unknown | 9 (2.4) |
| Done | 276 (73.4) |
| Positive | 16/276 (5.8) |
| Negative | 241/276 (87.3) |
| Indeterminate | 19/276 (6.9) |
| Steroid or thiopurine at IGRA | 214/276 (77.5) |
| QuantiFERON | 247 (62.9) |
| Positive | 14/247 (5.7) |
| Negative | 218/247 (88.3) |
| Indeterminate | 15/247 (6) |
| T-SPOT | 29 (12.6) |
| Positive | 2/29 (6.9) |
| Negative | 23/29 (79.3) |
| Indeterminate | 4/29 (13.8) |
| TST | |
| Unknown | 10 (2.7) |
| Done | 131 (34.8) |
| Positive | 12/131 (9.2) |
| Negative | 117/131 (89.3) |
| Steroid or thiopurine at TST | 104/131 (79.4) |
| Screening tests for LTBI | |
| 1 test (IGRA or TST) | 211 (56.1) |
| 2 tests (IGRA and TST) | 98 (26.1) |
| Neither IGRA or TST | 59 (15.7) |
| Latent tuberculosis infection | 30 (8.0) |
IGRA: Interferon gamma release assay; TST: Tuberculin skin test; LTBI: Latent tuberculosis infection.