| Type of specimen | Specimens n | Smear positive for AFB | Positive by NAA test for M. tuberculosis n/N#(%) | Culture positive for M. tuberculosis |
| Sputum | 90 | 26 (28.8) | 27/53 (50.9) | 44 (48.8) |
| BAL | 3 | 1/3 (33.3) | 3 (100) | |
| Tracheal aspirates | 33 | 3 (9) | 3/19 (15.7) | 6 (18.1) |
| Gastric fluid | 237 | 29 (12.2) | 45/155 (29) | 101 (42.6) |
| Tissue biopsy | 35 | 6 (17.1) | 10/27 (37) | 22 (62.8) |
| Pleura fluid | 10 | 2/7 (28.5) | 3 (30) | |
| Cerebrospinal fluid | 16 | 3/11 (27.2) | 7 (43.7) | |
| Pus | 21 | 10 (47.6) | 9/12 (75) | 19 (90.4) |
| Stool | 4 | 2 (50) |
Data are presented as n (%), unless otherwise stated. AFB: Acid-fast bacilli; BAL: bronchoalveolar lavage. #: N=number of NAA tests performed at clinician’s request.