tetano
Editor, Senior Moderator
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[SUP] 1 2 [/SUP], Joanna Jung[SUP] 1 2 [/SUP], Estella Tam[SUP] 2 [/SUP], Deepthi Rajapakshe[SUP] 2 [/SUP], Stephen Cheney[SUP] 1 [/SUP], Cameron Brown[SUP] 1 [/SUP], Jing Cao[SUP] 1 2 [/SUP], Kenneth Muldrew[SUP] 1 [/SUP], Ila Singh[SUP] 1 2 [/SUP], James Versalovic[SUP] 1 2 [/SUP], Sridevi Devaraj[SUP] 1 2 [/SUP]
Affiliations
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.
. 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[SUP] 1 2 [/SUP], Joanna Jung[SUP] 1 2 [/SUP], Estella Tam[SUP] 2 [/SUP], Deepthi Rajapakshe[SUP] 2 [/SUP], Stephen Cheney[SUP] 1 [/SUP], Cameron Brown[SUP] 1 [/SUP], Jing Cao[SUP] 1 2 [/SUP], Kenneth Muldrew[SUP] 1 [/SUP], Ila Singh[SUP] 1 2 [/SUP], James Versalovic[SUP] 1 2 [/SUP], Sridevi Devaraj[SUP] 1 2 [/SUP]
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.