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. 2021 May 22;13(6):962. doi: 10.3390/v13060962

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Plasma and dried blood spot collection comparison. Plasma and DBS samples collected in parallel from the same participant were processed and analyzed by Roche Elecsys Anti-SARS-CoV-2 (S) assay (n = 52 COVID-19-positive, n = 11 COVID-19-negative). Horizontal line indicates assay threshold as quoted by manufacturer for plasma/serum. (A) Distribution of values in plasma and DBS samples for mismatched samples (●) and matched samples (ο). (B) Dataset from (A) showing correlation between concentrations obtained from plasma vs. DBS.