Volume 26, Number 10—October 2020
Research Letter
Rapid Screening Evaluation of SARS-CoV-2 IgG Assays Using Z-Scores to Standardize Results
Marie K. Das, Anu Chaudhary, Andrew Bryan, Mark H. Wener, Susan L. Fink, and Chihiro Morishima
Table
Results from 4 immunoassays for severe acute respiratory syndrome coronavirus 2 IgG using a standardized z-score threshold of 3*
| Days from symptom onset | EU IgG | EPI IgG | ID NP IgG | ID S1RBD IgG |
|---|---|---|---|---|
| 0–6 | 0/4 (0) | 0/4 (0) | 2/4 (50) | 2/4 (50) |
| 7–13 | 1/11 (9) | 7/11 (64) | 7/11 (64) | 1/11 (9) |
| 14–20 | 7/8 (88) | 8/8 (100) | 8/8 (100) | 0/8 (0) |
*Values are no. positive/no. tested (%). EU, Euroimmun (https://www.euroimmun.com); EPI, Epitope Diagnostics (http://www.epitopediagnostics.com); ID, ImmunoDiagnostics (https://www.immunodiagnostics.com.hk); NP, nucleocapsid protein; RBD, receptor-binding domain; S1, spike protein.
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