Ann Clin Microbiol 2022;25:73-78. On-field evaluation of exdia COVID-19 antigen point-of-care testing in the emergency department during the COVID-19 pandemic
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Table 1. Distribution of Exdia Ag test result according to cycle threshold (Ct) values of Real-Q assay (RdRp gene)
Ct value of Real-Q assay (RdRp gene) Exdia Ag result
Positive No. (%) Negative No. (%)
≤ 15 (n = 59) 58 (98.3) 1 (1.7)
15 < Ct ≤ 20 (n = 41) 38 (92.7) 3 (7.3)
20 < Ct ≤ 25 (n = 18) 13 (72.2) 5 (27.8)
25 < Ct ≤ 30 (n = 16) 4 (25.0) 12 (75.0)
> 30 (n = 15) 2 (13.3) 13 (86.7)

Abbreviations: Exdia Ag, Exdia COVID-19 antigen; Real-Q, Real-Q 2019-nCoV Detection KIT; RdRp, RNA-dependent RNA polymerase gene.