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Table 4 Performance of antigen test (AgPOCT) according to RT-PCR Ct values

From: Performance of antigen testing for diagnosis of COVID-19: a direct comparison of a lateral flow device to nucleic acid amplification based tests

SARS-CoV2 Ct < 30 as clinically relevant Sensitivity (%) of different Ct cut-offs
Ag positive Ag negative   Ct < 25 Ct 25 to < 30 Ct 30 to < 35 Ct > 35
Ct value < 30 52 29   74.2 69.2 30.0 33.3
Ct value > 30 negative 36 2993      
Sensitivity (%)    64.2     
Specificity (%)    98.8     
PPV (%)    59.1     
NPV (%)    99.0