Summary of antibody tests used
| Name of assay | Target | Units | Cut-off |
| Abbott Architect SARS-CoV-2 IgG | Nucleocapsid | Calculated index S/C | 1.4 S/C |
| Roche Elecsys anti-SARS-CoV-2 | Nucleocapsid | Cut-off index COI | 1.0 COI |
| DiaSorin LIAISON SARS CoV-2 S1/S2 IgG assay | Spike protein | Arbitrary units (AU)/ml | 15.0 AU/ml |
COI, Cut-off Index.