Table 2.
Predictive positive and predictive negative values of rSARS-CoV-2 S proteins for urine and serum samples.
| rSARS-CoV-2 S antigen | Sample | PPV | NPV | Indeterminate |
|---|---|---|---|---|
| Euk1-S1 | URINE | 0.989 | 0.442 | 17 |
| SERUM | 0.939 | 0.675 | 2 | |
| Prok1-S1 | URINE | 0.991 | 0.659 | 10 |
| SERUM | 0.988 | 0.493 | 23 | |
| Prok2-S1 | URINE | 0.992 | 0.848 | 12 |
| SERUM | 0.981 | 0.398 | 39 |
PPV and NPV were calculated based on the index value, excluding the indeterminate value samples and using the equation: NPV = true negative/false negative + true negative, and PPV = true positive/false positive + true positive.