TABLE 4.
Comparison of confirmed results by LCx M. tuberculosis Assay and culture in 526 nonrespiratory specimens
| Test and result | No. of specimens with extrapulmonary TB result
|
% Sensitivity | % Specificity | % PPV | % NPV | ||
|---|---|---|---|---|---|---|---|
| Positive | Negative | Total | |||||
| LCx M. tuberculosis Assay | 78.5 | 100 | 100 | 93.1 | |||
| Positive | 106 | 0 | 106 | ||||
| Negative | 29 | 391a | 420 | ||||
| Total | 135 | 391 | 526 | ||||
| Culture | 96.2 | 100 | 100 | 98.7 | |||
| Positive | 130 | 0 | 130 | ||||
| Negative | 5b | 391a | 396 | ||||
| Total | 135 | 391 | 526 | ||||
a
Thirty-eight specimens with culture positive for NTM.
b
From four patients with anti-TB treatment and one patient with active cervical tuberculous lymphadenitis.