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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 MorishimaComments to Author 
Author affiliations: University of Washington, Seattle, Washington, USA

Main Article


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 (; EPI, Epitope Diagnostics (; ID, ImmunoDiagnostics (; NP, nucleocapsid protein; RBD, receptor-binding domain; S1, spike protein.

Main Article

Page created: July 11, 2020
Page updated: September 17, 2020
Page reviewed: September 17, 2020
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