CC BY-NC-ND 4.0 · J Lab Physicians 2022; 14(03): 324-328
DOI: 10.1055/s-0042-1744237
Original Article

Diagnostic Efficacy of COVID-19 Rapid Antigen Detection Card in Diagnosis of SARS-CoV-2

1   Department of Microbiology, Chettinad Hospital and Research Institute, Kelambakkam, Tamil Nadu, India
Lino V. Koshy
1   Department of Microbiology, Chettinad Hospital and Research Institute, Kelambakkam, Tamil Nadu, India
Priyadarshini Shanmugam
1   Department of Microbiology, Chettinad Hospital and Research Institute, Kelambakkam, Tamil Nadu, India
› Author Affiliations


Introduction The rapid surge of severe acute respiratory syndrome-coronavirus-2 (SARS-CoV-2) cases globally makes it essential for rapid diagnosis of coronavirus disease 2019 (COVID-19). Real-time reverse-transcription polymerase chain reaction (rtRT-PCR) remains as the gold standard to detect COVID-19 cases because of its greater sensitivity and specificity. However, because of its prolonged turnaround time and technical expertise, recommendations have been made to employ the use of rapid diagnostic test for rapid diagnosis and to curb the spread of the disease.

Methods This prospective study was performed in a tertiary COVID-19 care hospital located amidst the semi-urban settings. Both nasopharyngeal and throat swabs collected from the COVID 19 suspected study participants were subjected to both COVID 19 rtRT-PCR and rapid antigen testing.

Results Of the total 599 samples tested by rtRT-PCR, 310 (52%) were positive and 289 (48%) tested negative for SARS-CoV-2. Of the 599 samples tested by rapid antigen test (RAT), 230 (38%) were positive and 369 (62%) were negative. The overall sensitivity and specificity of our study kit was found to be 74.19 and 100%, respectively. The sensitivity of the RAT greatly overlaps with the viral load which is determined by the cycle threshold (CT) values of SARS-CoV-2, E gene, and RdRp gene.

Conclusion RAT yields rapid results within a short-turnaround time and found to be cost effective. Therefore, this test can be adopted in areas with rapid surge in SARS-CoV-2 cases which can help to rapidly identify the positive cases and to implement isolation and infection control measures.

Ethical Approval

This study was approved by the Ethical Committee with proposal no.: 187/IHEC/November2020.

Authors' Contribution

P.S. and A.P.S.R. designed the study. A.P.S.R. and P.S. collected and analyzed the data. L.K., P.S., and A.P.S.R. participated in the manuscript revision. All authors approved the final draft of the manuscript.

Publication History

Article published online:
25 April 2022

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