Table 2.
Positive Predictive Value of AFB Across Different Clinical Characteristics
| Clinical Characteristics | Total AFB Smear Specimens | Positive Culture for TB | Negative Culture for TB | AFB PPV |
|---|---|---|---|---|
| Total | 130 | 82 | 48 | 63.1% |
| Immunocompromised | 37 | 14 | 23 | 37.8% |
| HIV seropositive | 22 | 10 | 12 | 45.5% |
| Cancer and/or transplant patient | 15 | 4 | 11 | 26.7% |
| Previous history of TB | 24 | 15 | 9 | 62.5% |
| Non-immunocompromised | 102 | 71 | 31 | 69.6% |
| PPD positive | 29 | 25 | 4 | 86.2% |
| Drug abuse | 32 | 24 | 8 | 51.8% |
Abbreviations: AFB, acid-fast bacilli; HIV, human immunodeficiency virus; PPD, purified protein derivative; PPV, positive predictive value; TB, tuberculosis.