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. 2020 Dec 17;176:112912. doi: 10.1016/j.bios.2020.112912

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Fig. 3 — SWV responses of the COVID-19 ePAD tested with different concentrations of SARS-CoV-2 IgG (A) and SARS-CoV-2 IgM (B) in the presence of 5 mM [Fe(CN)₆]^3-/4-. (C) A linear relationship between $Δ$ current vs logarithmic concentration of SARS-CoV-2 IgG and IgM and its corresponding relationship between $Δ$ current and concentration of SARS-CoV-2 IgG and IgM. The threshold line was estimated based on an LOD (3SD_blank/slope) and the starting point of the calibration plots.