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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