Performance Evaluation of the STANDARD i-Q COVID-19 Ag Test with Nasal and Oral Swab Specimens from Symptomatic Patients
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Published:2024-01-22
Issue:2
Volume:14
Page:231
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ISSN:2075-4418
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Container-title:Diagnostics
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language:en
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Short-container-title:Diagnostics
Author:
Seo Jong Do1, Moon Hee-Won12, Shin Eunju12, Kim Ji Young1, Choi Sang-Gyu1, Lee Ju Ae3, Choi Jeong Hwa3, Yun Yeo-Min12ORCID
Affiliation:
1. Department of Laboratory Medicine, Konkuk University Medical Center, Seoul 05030, Republic of Korea 2. Department of Laboratory Medicine, Konkuk University School of Medicine, Seoul 05030, Republic of Korea 3. Department of Infection Control, Konkuk University Medical Center, Seoul 05030, Republic of Korea
Abstract
We evaluated the diagnostic performance of the STANDARD i-Q COVID-19 Ag Test, which was developed to detect viral antigens, using nasal and oral swabs. Sixty positive and 100 negative samples were analyzed. We determined the distribution of the Ct values according to the day of sample collection after symptom onset, the diagnostic performance of the total samples and subgroups separated by Ct value or time of sample collection, and the Ct value at which maximal accuracy was expected. No differences were observed in Ct values, except for the samples obtained on the day of symptom onset. The diagnostic sensitivity and specificity of the oral swabs were 75.0 and 100.0%, respectively, whereas those of the nasal swabs were 85.0 and 98.0%, respectively. The sensitivity was higher in samples with a high viral load collected earlier than those collected later, although the difference was not significant. False-negative results were confirmed in all samples with a Ct value ≥ 30.0. These results indicate that tests using oral and nasal swabs are helpful for diagnosing acute symptomatic cases with suspected high viral loads. Our tests exhibited relatively low sensitivity but high specificity rates, indicating the need to assess negative antigen test results.
Subject
Clinical Biochemistry
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