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| Repeatability | Samples | Mean CV (%) | |||
|---|---|---|---|---|---|
| RBD-IgG | RBD-IgM | Spike-IgG | Spike-IgM | ||
| Intra–assay (n = 4) | Strong positives | 7 | 6.2 | 4.4 | 6.8 |
| Weak positives | 5.2 | 8 | 5 | 9 | |
| Negatives | 7.2 | 7.6 | 7.4 | 8.8 | |
| Inter–assay (n = 5) | Strong positives | 7 | 6 | 4 | 7 |
| Weak positives | 5 | 8 | 5 | 9 | |
| Negatives | 7 | 8 | 7 | 9 | |
