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Linearity results. (A) Anti‐severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) immunoglobulin G (IgG) high‐level sample (170.18 U/ml) serially diluted with a low‐level pool (0.60 U/ml). (B) Anti‐SARS‐CoV‐2 immunoglobulin M (IgM) high‐level sample (6.63 cut off index [COI]) serially diluted with a low‐level pool (0.11 COI)
