Table 4 Visual interpretation summary of test kit-based study.

From: A SARS-CoV-2 antigen rapid diagnostic test for resource limited settings

RT-qPCR N1 Ct

Test line result (+/−)

Control line result (+/−)

12.2

 + 

 + 

15.8

 + 

 + 

14.5

 + 

 + 

19.8

 + 

 + 

20.4

 + 

 + 

23.0

 + 

 + 

22.3

 + 

 + 

25.0

 + 

 + 

26.5

 + 

 + 

25.3

 − 

 + 

  1. 400 µL of RT-qPCR known positive SARS-CoV-2 saline swab samples added to sample extraction buffer tube and evaluated on SARS-CoV-2 antigen RDT. The results agree with previous cutoff for RT-qPCR positives on RDT around 25 Ct for the N1 assay.