Table 5:
Units assigned to the U.S. SARS-CoV-2 Serology Standard
| Units assigned by FNLCR | WHO-calibrated units | ||||||
|---|---|---|---|---|---|---|---|
| Functional activity | Spike & Nucleocapsid IgM | Spike & Nucleocapsid IgG | Functional activity | Spike IgG | Nucleocapsid IgG | Spike IgM | Nucleocapsid IgM |
| 200 NU/mL | 100 BAU/mL | 1200 BAU/mL | 815 IU/mL | 764 BAU/mL | 681 BAU/mL | 246 BAU/mL | 1037 BAU/mL |
FNLCR: Frederick National Laboratory for Cancer Research; WHO: World Health Organization; NU/mL: Neutralizing Units per milliliter; BAU/mL: Binding Assay Units per milliliter; IU/mL: International units per milliliter