Table 2 Comparison of bronchoalveolar lavage (BAL) smear for acid and alcohol fast bacilli (AAFB), nucleic acid amplification testing (TB-SDA) and a PPD-based immunoassay as diagnostic tools in Mycobacterium tuberculosis culture positive individuals | BAL AAFB smear positive | TB-SDA positive | Positive BAL immunoassay |
| BAL AAFB smear positive | 100% (30/30) | 97% (29/30) | 93% (28/30) |
| BAL AAFB smear negative | 0% (0/37) | 54% (20/37) | 95% (35/37) |
| Total | 45% (30/67) | 73% (49/67) | 94% (63/67) |