Am J Clin Pathol . Clinical Validation and Performance Evaluation of the Automated Vitros Total Anti-SARS-CoV-2 Antibodies Assay for Screening of Serostatus in COVID-19

[tetano]

Am J Clin Pathol


. 2020 Aug 31;aqaa157.
doi: 10.1093/ajcp/aqaa157. Online ahead of print.
Clinical Validation and Performance Evaluation of the Automated Vitros Total Anti-SARS-CoV-2 Antibodies Assay for Screening of Serostatus in COVID-19


Emily Garnett ^{1 2} , Joanna Jung ^{1 2} , Estella Tam ² , Deepthi Rajapakshe ² , Stephen Cheney ¹ , Cameron Brown ¹ , Jing Cao ^{1 2} , Kenneth Muldrew ¹ , Ila Singh ^{1 2} , James Versalovic ^{1 2} , Sridevi Devaraj ^{1 2}



Affiliations

• PMID: 32864699
• DOI: 10.1093/ajcp/aqaa157

Abstract

Objectives: Evaluation of serostatus against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has emerged as an important tool in identification of exposure to coronavirus disease 2019 (COVID-19). We report on the validation of the Vitros Anti-SARS-CoV-2 Total (CoV2T) assay for qualitative serologic testing of SARS-CoV-2 antibodies.
Methods: We performed validation studies according to Commission of Office Laboratories Accreditation guidelines, using samples previously tested for SARS-CoV-2 by reverse transcription-polymerase chain reaction (RT-PCR). We evaluated precision, analytical interferences, and cross-reactivity with other viral infections; evaluated concordance with molecular and other serologic testing; and evaluated seroconversion.
Results: The Vitros CoV2T assay exhibited acceptable precision and did not exhibit cross-reactivity with other acute respiratory virus infections. The CoV2T assay exhibited 100% negative predictive agreement (56/56) and 71% positive predictive agreement (56/79) with RT-PCR across all patient samples and was concordant with other serologic assays. Concordance with RT-PCR was 97% more than 7 days after symptom onset. The CoV2T assay was robust to icterus and lipemia but had interference from significant hemolysis.
Conclusions: The Vitros CoV2T assay was successfully validated in our laboratory. We anticipate it will be a useful tool in screening for exposure to SARS-CoV-2; however, the use of the CoV2T and other serologic assays in the clinical management of patients with COVID-19 is unknown and must be evaluated in future studies.

Keywords: Serology; Coronavirus; IgG; IgM; SARS CoV-2 antibody; alidation.