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Calibrated concentrations to the WHO IS, reported in binding antibody unit per milliliter
| Standard | Spike IgG (BAU/mL) | Nucleocapsid IgG (BAU/mL) | Spike IgM (BAU/mL) | Nucleocapsid IgM (BAU/mL) | Neutralization assay (IU/mL) |
|---|---|---|---|---|---|
| WHO IS | 1,000 | 1,000 | 1,000 | 1,000 | 1,000 |
| U.S. serology standard | 764 | 681 | 246 | 1,037 | 813 |
| Internal daily assay reference | 94 | 74 | 911 | 10,707 | NAa |
NA, not available.
