Table 2.
Comparison between TST and IGRA results
| TST (N = 74) | TSPOT+ (N = 23) | TST (N = 217) | QFT+ (N = 60) | INF -γ (IU/ml) Median (range) | |
|---|---|---|---|---|---|
| TST (mm) | No. (% of TST) | No. (% of TST) | |||
| <5 | 56 | 10 (18) | 165 | 26 (16) | 0.81 (0.39-10) |
| 5-10 | 7 | 6 (86) | 17 | 8 (47) | 7.20 (1.44-10) |
| 11-14 | 3 | 1 (33) | 12 | 10 (83) | 2.60 (0.57-10) |
| ≥ 15 | 8 | 6 (75) | 23 | 16 (70) | 4.68 (0.5-10) |
TST = Tuberculin skin test. IGRA = Interferon-gamma Release Assay. TSPOT = T-SPOT.TB. QFT = QuantiFERON-TB Gold. INF-γ = Interferon-gamma .TST results were missing for 63 negative QFTs, 17 positive QFTs and 1 indeterminate QFT. TST results were missing for 6 positive TSPOTs, 36 negative TSPOTs and 1 borderline TSPOT.