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Comparison of AmpSure, AFB smear, and culture results for pleural fluid samples.
| Method | Sensitivity | Specificiy | PPV | NPV | Accuracy |
|---|---|---|---|---|---|
| AmpSure | 21.2% | 100% | 100% | 3.1% | 36.3% |
| AFB smear | 3.1%a | 96.4% | 78.6% | 19.8% | 21.0% |
| Mt culture | 17.8%b | 100% | 100% | 22.4% | 33.6% |
AFB, acid-fast bacilli; PF, pleural fluid; Mt, Mycobacterium tuberculosis;
ap < 0.001 compared with AmpSure, bp > 0.05 compared with AmpSure.
