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. 2021 Apr 23;75(8):564–571. doi: 10.1136/jclinpath-2020-207356

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© Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Comparison of antibody titres using different testing platforms. COVID-19 positive control samples (n=24) were measured on the anti-RBD IgG (A) and IgM (B) ELISAs as well as on the Ortho VITROS total anti-SARS-CoV-2 Ig platform (C). ELISA measurements reported as titres and were converted to a log 10 scale (A, B). Ortho VITROS measurements reported as signal to cut-off ratio (S/C) (C). IgG titres below 1:100, IgM titres below 1:40, and S/C values below 1.0 were considered negative. Bars represent the median and IQR (A–C). Titers are shown on logarithmic scale. RBD, receptor binding domain.