tetano
Editor, Senior Moderator
Am J Clin Pathol
. 2021 Oct 20;aqab173.
doi: 10.1093/ajcp/aqab173. Online ahead of print.
Performance of the LumiraDx Microfluidic Immunofluorescence Point-of-Care SARS-CoV-2 Antigen Test in Asymptomatic Adults and Children
Paul Drain[SUP] 1 [/SUP], Raed Sulaiman[SUP] 2 [/SUP], Melanie Hoppers[SUP] 3 [/SUP], Nigel M Lindner[SUP] 4 [/SUP], Vicki Lawson[SUP] 4 [/SUP], Jayne E Ellis[SUP] 4 [/SUP]
Affiliations
Abstract
Objectives: The LumiraDx SARS-CoV-2 Ag Test has previously been shown to accurately detect severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in individuals symptomatic for coronavirus disease 2019 (COVID-19). This evaluation investigated the LumiraDx SARS-CoV-2 Ag Test as an aid in the diagnosis of SARS-CoV-2 infection in asymptomatic adults and children.
Methods: Asymptomatic individuals at high risk of COVID-19 infection were recruited in 5 point-of-care (POC) settings. Two paired anterior nasal swabs were collected from each participant, tested by using the LumiraDx SARS-CoV-2 Ag Test at the POC, and compared with results from reverse transcription-polymerase chain reaction (RT-PCR) assays (cobas 6800 [Roche Diagnostics] or TaqPath [Thermo Fisher Scientific]). We calculated positive percent agreement (PPA) and negative percent agreement (NPA), then stratified results on the basis of RT-PCR reference platform and cycle threshold.
Results: Of the 222 included study participants confirmed to be symptom-free for at least 2 weeks before testing, the PPA was 82.1% (95% confidence interval [CI], 64.4%-92.1%). The LumiraDx SARS-CoV-2 Ag Test correctly identified 95.8% (95% CI, 79.8%-99.3%) of the samples confirmed positive in fewer than 33 RT-PCR cycles and 100% (95% CI, 85.1%-100%) in fewer than 30 RT-PCR cycles while maintaining 100% NPA.
Conclusions: This rapid, high-sensitivity test can be used to screen asymptomatic patients for acute SARS-CoV-2 infection in clinic- and community-based settings.
Keywords: Asymptomatic; COVID-19; LumiraDx antigen test; RT-PCR; SARS-CoV-2; Sensitivity.
. 2021 Oct 20;aqab173.
doi: 10.1093/ajcp/aqab173. Online ahead of print.
Performance of the LumiraDx Microfluidic Immunofluorescence Point-of-Care SARS-CoV-2 Antigen Test in Asymptomatic Adults and Children
Paul Drain[SUP] 1 [/SUP], Raed Sulaiman[SUP] 2 [/SUP], Melanie Hoppers[SUP] 3 [/SUP], Nigel M Lindner[SUP] 4 [/SUP], Vicki Lawson[SUP] 4 [/SUP], Jayne E Ellis[SUP] 4 [/SUP]
Affiliations
- PMID: 34668536
- DOI: 10.1093/ajcp/aqab173
Abstract
Objectives: The LumiraDx SARS-CoV-2 Ag Test has previously been shown to accurately detect severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in individuals symptomatic for coronavirus disease 2019 (COVID-19). This evaluation investigated the LumiraDx SARS-CoV-2 Ag Test as an aid in the diagnosis of SARS-CoV-2 infection in asymptomatic adults and children.
Methods: Asymptomatic individuals at high risk of COVID-19 infection were recruited in 5 point-of-care (POC) settings. Two paired anterior nasal swabs were collected from each participant, tested by using the LumiraDx SARS-CoV-2 Ag Test at the POC, and compared with results from reverse transcription-polymerase chain reaction (RT-PCR) assays (cobas 6800 [Roche Diagnostics] or TaqPath [Thermo Fisher Scientific]). We calculated positive percent agreement (PPA) and negative percent agreement (NPA), then stratified results on the basis of RT-PCR reference platform and cycle threshold.
Results: Of the 222 included study participants confirmed to be symptom-free for at least 2 weeks before testing, the PPA was 82.1% (95% confidence interval [CI], 64.4%-92.1%). The LumiraDx SARS-CoV-2 Ag Test correctly identified 95.8% (95% CI, 79.8%-99.3%) of the samples confirmed positive in fewer than 33 RT-PCR cycles and 100% (95% CI, 85.1%-100%) in fewer than 30 RT-PCR cycles while maintaining 100% NPA.
Conclusions: This rapid, high-sensitivity test can be used to screen asymptomatic patients for acute SARS-CoV-2 infection in clinic- and community-based settings.
Keywords: Asymptomatic; COVID-19; LumiraDx antigen test; RT-PCR; SARS-CoV-2; Sensitivity.