Many serologic tests are now available for measuring severe acute respiratory syndrome coronavirus 2 antibodies to evaluate potential protective immunity and for seroprevalence studies. We describe an approach to standardizing positivity thresholds and quantitative values for different assays that uses z-scores to enable rapid and efficient comparison of serologic test performance.
Keywords: COVID19; IgG; SARS-CoV-2; antibody; coronavirus; coronavirus disease; performance; qualitative results; quantitative results; respiratory infections; screening; serologic analysis; severe acute respiratory syndrome coronavirus 2; standardization; viruses; z-scores; zoonoses.