Table 1.
Diagnostic performance of the STANDARD Q COVID-19 Ag test compared to real-time PCR.
| Diagnostic Performance | Nasopharyngeal Specimen | Nasal Cavity Specimen | ||
|---|---|---|---|---|
| Value | 95% CI | Value | 95% CI | |
| Sensitivity (%) | 81.7 | 72.7–90.7 | 77.5 | 67.8–87.2 |
| Specificity (%) | 100.0 | 100.0–100.0 | 100.0 | 100.0–100.0 |
| Positive predicted value (%) | 100.0 | 100.0–100.0 | 100.0 | 100.0–100.0 |
| Negative predicted value (%) | 88.9 | 83.2–94.6 | 86.7 | 80.6–92.8 |
| False positive value (%) | 0.0 | 0.0–0.0 | 0.0 | 0.0–0.0 |
| False negative value (%) | 18.3 | 9.3–27.3 | 22.5 | 12.8–32.3 |
| Accuracy (%) | 92.6 | 88.7–96.5 | 90.9 | 86.6–95.1 |
Abbreviations: CI: confidence interval.