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SHR Neuro Cancer Cardio Lipid Metab Microb

Niedrist, T; Kriegl, L; Zurl, CJ; Schmidt, F; Perkmann-Nagele, N; Mucher, P; Repl, M; Flieder, I; Radakovics, A; Sieghart, D; Radner, H; Aletaha, D; Binder, CJ; Gully, C; Krause, R; Herrmann, M; Wagner, OF; Perkmann, T; Haslacher, H.
Preanalytical stability of SARS-CoV-2 anti-nucleocapsid antibodies
CLIN CHEM LAB MED. 2022; Doi: 10.1515/cclm-2022-0875
Web of Science PubMed FullText FullText_MUG

 

Leading authors Med Uni Graz

Niedrist Tobias

Co-authors Med Uni Graz

Gülly Christian

Herrmann Markus

Krause Robert

Kriegl Lisa

Zurl Christoph Johann

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Abstract:

Objectives Anti-nucleocapsid (NC) antibodies are produced in response to SARS-CoV-2 infection. Therefore, they are well suited for the detection of a previous infection. Especially in the case of seroprevalence studies or during the evaluation of a novel in-vitro diagnostic test, samples have been stored at <-70 degrees C (short- and long-term) or 2-10 degrees C (short-term) before analysis. This study aimed to assess the impact of different storage conditions relevant to routine biobanking on anti-NC antibodies. Methods The preanalytical impact of short-term storage (84 [58-98] days) on <-70 degrees C and for 14 days at 2-10 degrees C was evaluated using samples from 111 donors of the MedUni Vienna Biobank. Long-term effects (443 [409-468] days) were assessed using 208 samples from Biobank Graz and 49 samples from Biobank Vienna. Anti-Nucleocapsid antibodies were measured employing electrochemiluminescence assays (Roche Anti-SARS-CoV-2). Results After short-term storage, the observed changes did not exceed the extent that could be explained by analytical variability. In contrast, results after long-term storage were approximately 20% higher and seemed to increase with storage duration. This effect was independent of the biobank from which the samples were obtained. Accordingly, the sensitivity increased from 92.6 to 95.3% (p=0.008). However, comparisons with data from Anti-Spike protein assays, where these deviations were not apparent, suggest that this deviation could also be explained by the analytical variability of the qualitative Anti-NC assay. Conclusions Results from anti-NC antibodies are stable during short-term storage at <-70 degrees C and 2-10 degrees C. After long-term storage, a slight increase in sensitivity could not be ruled out.

Find related publications in this database (Keywords)

preanalytical phase

SARS-CoV-2 antibodies

serology

stability

storage

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