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Assay variability of the COVID-19 SIA.
| Assay Variation | Intra | Inter | ||
|---|---|---|---|---|
| Isotype | IgM (MFI) |
IgG (MFI) |
IgM (MFI) |
IgG (MFI) |
| 2508 | 1391 | 2584 | 1446 | |
| 2584 | 1446 | 2566 | 1442 | |
| 2688 | 1411 | 2374 | 1348 | |
| 2651 | 1432 | 2525 | 1394 | |
| 2403 | 1366 | 2319 | 1263 | |
| Mean | 2567 | 1409 | 2474 | 1379 |
| SD | 115 | 32 | 120 | 76 |
| %CV | 4 | 2 | 5 | 6 |
COVID-19, Coronavirus disease 2019; SIA, suspension immunoassay; SD, standard deviation; CV, coefficient of variability; Ig, immunoglobulin; MFI, median fluorescence intensity.
