Agreement Between SARS-CoV-2 PCR Test Results Using Nasopharyngeal and Mid-Turbinate Specimens Among Asymptomatic Working-Age Adults.

Authors

Judy Wendt Hess
Faiyaz Bhojani
Derrick Cameron
Mary Freire de Carvalho
Fayaz Momin

Publication Date

9-1-2022

Journal

Journal of Occupational Environmental Medicine

Abstract

OBJECTIVE: The aim of this study was to determine whether mid-turbinate specimens reliably detect active infection in asymptomatic adults undergoing regular COVID-19 PCR testing.

METHODS: Qualitative agreement between 2481 paired nasopharyngeal and mid-turbinate PCR results was assessed. Mean cycle threshold values for each positive result were evaluated as an indicator of active infection.

RESULTS: Overall agreement between nasopharyngeal and mid-turbinate tests was 98.4%. Positive percent agreement was 37.2%, and negative percent agreement was ~100%. Test pairs with lower cycle thresholds (≤30 and ≤25) reached 67% and 100% positive percent agreement, respectively.

CONCLUSIONS: SARS-CoV-2 infections with high viral loads were detected regardless of specimen type. Mid-turbinate swabs reduced staff discomfort and may decrease repeated positive test results weeks or months after initial infection. Discordant pairs generally had high cycle threshold values (>30) indicating low viral load and little risk of transmitting COVID-19.

Keywords

Adult, COVID-19, COVID-19 Testing, Humans, Nasopharynx, Polymerase Chain Reaction, SARS-CoV-2, Sensitivity and Specificity, Turbinates