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Diagnostic performance of Xpert, Xpert Ultra, and AFB compared with the MGIT culture
| Xpert | Xpert Ultra | AFB | MTB culture | |
|---|---|---|---|---|
| Positive tests | 10/140 | 16/140 | 2/140 | 10/140 |
| Sensitivity | 82% | 91% | 18% | – |
| Specificity | 99% | 95% | 100% | – |
| PPV | 90% | 62.5% | 100% | – |
| NPV | 98% | 99% | 93% | – |
PPV positive predictive value, NPV negative predictive value
