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Test sensitivity and specificity depending on repeat testing of semiquantitative trace-positive results for MTB detection by Ultra.
| Sensitivity | Specificity | ||
|---|---|---|---|
| All culture positive (95% CI, n/N) | Smear-negative, culture-positive (95% CI, n/N) | All culture negative (95% CI, n/N) | |
| Xpert | 86% (81–91, 147/174) | 76% (67–85, 61/88) | 100% (NA, 185/185) |
| Ultra | 95% (92–98, 165/174) | 90% (84–96, 79/88) | 98% (96–100, 181/185) |
| Ultra (trace repeat) | 95% (98–92, 165/174) | 90% (84–96, 79/88) | 100% (NA, 185/185) |
