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Table 3 Cases with discordant results between the Standard Q COVID-19 Ag test and RT-PCR assays

From: Rapid SARS-CoV-2 antigen detection assay in comparison with real-time RT-PCR assay for laboratory diagnosis of COVID-19 in Thailand

Gender Age Initial diagnosis Specimen type Ct-value of RT-PCR Rapid Ag test result Interpretation
E RdRp N
F 33 Pneumonia NP swab + throat swab 31.18 39.20 35.54 Negative False negative
F 67 Pre-operative NP swab + throat swab  > 40  > 40  > 40 Positive False positive
M 75 Pre-operative NP swab + throat swab  > 40  > 40  > 40 Positive False positive
F 61 Pre-operative NP swab + throat swab  > 40  > 40  > 40 Positive (weakly) False positive
F 83 Pre-operative NP swab + throat swab  > 40  > 40  > 40 Positive (weakly) False positive
F 64 Pre-operative NP swab + throat swab  > 40  > 40  > 40 Positive (weakly) False positive