@article{3219502,
    title = "Field Evaluation of the New Rapid NG-Test® SARS-CoV-2 Ag for Diagnosis of COVID-19 in the Emergency Department of an Academic Referral Hospital",
    author = "Avgoulea, K. and Beredaki, M.-I. and Vourli, S. and Siopi, M. and Siafakas, N. and Pournaras, S.",
    journal = "Frontiers in public health",
    year = "2022",
    volume = "10",
    publisher = "Frontiers Media S.A",
    issn = "2296-2565",
    doi = "10.3389/fpubh.2022.840984",
    keywords = "virus antigen, adult;  diagnosis;  emergency;  hospital;  hospital emergency service;  human;  pandemic;  patient referral;  sensitivity and specificity, Adult;  Antigens, Viral;  COVID-19;  Emergencies;  Emergency Service, Hospital;  Hospitals;  Humans;  Pandemics;  Referral and Consultation;  SARS-CoV-2;  Sensitivity and Specificity",
    abstract = "Background: As the COVID-19 pandemic resurges affecting large numbers of patients, rapid, and accurate diagnosis using point-of-care tests is very important. Objectives: To evaluate the NG-Test® SARS-CoV-2 Ag (NG-Test) immunoassay for qualitative detection of SARS-CoV-2 antigen in nasopharyngeal (NP) and oropharyngeal (OP) samples compared with RT-PCR, in patients attending the Emergencies of an academic referral hospital. Methods: All adult ambulatory patients presenting to the Emergencies of “Attikon” University hospital (Athens, Greece) within three consecutive hours per day between December 2020 and March 2021 and for whom SARS-CoV-2 PCR testing was requested were included. Two NP and one OP samples obtained from each participant were analyzed to determine the diagnostic performance [sensitivity, specificity, positive/negative predictive values (PPV/NPV)] of the NG-Test (NP/OP swabs) in comparison to the reference RT-PCR (NP swab). Results: Overall, 134/263 (51%) patients tested were RT-PCR positive, whereof 108 (overall sensitivity 81%, 95% CI 73–87%) were NP NG-Test positive (PPV 99%, NPV 83%) and 68 (overall sensitivity 51%, 95% CI 42–59%) were OP NG-Test positive (PPV 100%, NPV 66%). The test's specificity (95% CI) was 99% (95–100%) and 100% (96–100%) for NP and OP swabs, respectively. The assay's sensitivity (95% CI) for high viral load (Ct ≤25) was 99% (92–100%) and 71% (60–81%) for NP and OP swabs, respectively. Conclusions: NG-Test using NP swabs detected almost all patients with high viral loads, showing satisfactory performance as a point-of-care test for NP samples obtained from patients with acute infection. Copyright © 2022 Avgoulea, Beredaki, Vourli, Siopi, Siafakas and Pournaras."
}