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. 2021 Feb 1;90:15–22. doi: 10.1016/j.clinbiochem.2021.01.010

Fig. 2.

Fig. 2

Antibody index vs. days after symptom onset for SARS-CoV-2 PCR positive patients. Antibody indices were established as follows: Negative ≤ 2.50, Equivocal 2.51 – 4.0, and Positive > 4.0. The mean number of days after symptom onset for the 12 samples (n = 8 patients) with negative antibody results was 7 (range: 4–12 days), the mean number of days after symptom onset for the 5 samples (n = 5 patients) with equivocal antibody results was 8 (range: 6–11 days), and the mean number of days after symptom onset for the 52 samples (n = 25 patients) with positive antibody results was 16 (range: 7–35 days).