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Table 1 Point-of-Care test results of AgPOCT compared to NAAT of samples tested within 24 h

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 Entire cohort Asymptomatic patients Symptomatic patients
Ag positive Ag negative   Ag positive Ag negative   Ag positive Ag negative  
NAAT positive 57 39   20 22   34 17  
NAAT negative 31 2983   25 2273   6 192  
Sensitivity (%)    59.4    47.6    66.7
Specificity (%)    99.0    98.9    97.0
PPV (%)    64.8    44.4    85.0
NPV (%)    98.7    99.0    91.9