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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