Table 5.
Positive samples (determined by the reference method) divided according to the CT compared to GenBody COVID-19 Ag RATs in nasal and nasopharyngeal swabs.
| CT Range | CT ≤ 25 | 25 < CT ≤ 28 | 28 < CT ≤ 31 | CT > 31 |
|---|---|---|---|---|
| No. of positive cases in RT-qPCR | 57 | 28 | 12 | 6 |
| Nasal swab No. of positive cases in tested device |
57 | 27 | 10 | 3 |
| Nasopharyngeal swab No. of positive cases in tested device |
57 | 28 | 11 | 4 |
| Nasal swab Sensitivity of the test depending on CT |
100% (95%CI 93.73% to 100%) |
96.43% (95%CI 81.65% to 99.91%) |
83.33% (95%CI 51.59% to 97.91%) |
50% (95%CI 11.81% to 88.19%) |
| Nasopharyngeal swab Sensitivity of the test depending on CT |
100% (95%CI 93.73 to 100%) |
100% (95%CI 87.66% to 100%) |
91.67% (95%CI 61.52 to 99.79%) |
66.67% (95%CI 22.28% to 95.67%) |
| Positive co-incidence rate * |
1/1 | 0.96/1 | 0.83/0.92 | 0.5/0.67 |
* The values are separated for nasal and nasopharyngeal swabs.