TABLE 2.
Diagnostic performance of the BinaxNOW antigen card compared to the TaqPath COVID-19 kit for detection of SARS-CoV-2a
| BinaxNOW antigen card result | No. of samples tested with TaqPath COVID-19 kit |
||
|---|---|---|---|
| Positive | Negative | Total | |
| Positive | 24 | 0 | 24 |
| Negative | 21 | 2,593 | 2,614 |
| Total | 45 | 2,593 | 2,638 |
a
The analytical sensitivity (positive agreement) was 53.3% (95% CI, 39.1% to 67.1%), the analytical specificity (negative agreement) was 100% (95% CI, 99.9% to 100%), the positive predictive value was 100% (95% CI, 86.2% to 100%), the negative predictive value was 99.2% (95% CI, 98.7% to 99.4%), and the kappa coefficient was 0.69 (95% CI, 0.57 to 0.82) (predictive values are assuming a disease prevalence of 1.7%). Note that 4 inconclusive RT-PCR results and 3 invalid BinaxNOW results were excluded from the calculations in the table.