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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: None declared.
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Employment or leadership: None declared.
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Honorarium: None declared.
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Competing interests: The funding organization(s) played no role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the report for publication.
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Conflict of interest disclosure: All authors declare no conflicts of interest.
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Ethical approval: Patient consent was obtained in writing.
References
1. Arendt JF, Nexo E. Unexpected high plasma cobalamin. Clin Chem Lab Med 2013;51:489–96.10.1515/cclm-2012-0545Search in Google Scholar
2. Andrès E, Serraj K, Zhu J, Vermorken AJ. The pathophysiology of elevated vitamin B12 in clinical practice. Q J Med 2013;106:505–15.10.1093/qjmed/hct051Search in Google Scholar
3. De Haro L, Marquet J, Tonetti C, Zittoun J. Hypervitaminémie B12 sérique due à un anticorps antitranscobalamine II: À propos d’un cas. Rev Med Interne 2001;22:1132–3.10.1016/S0248-8663(01)00481-7Search in Google Scholar
4. Favresse J, Burlacu MC, Maiter D, Gruson D. Interferences with thyroid function immunoassays: clinical implications and detection algorithm. Endocr Rev 2018;39:830–50.10.1210/er.2018-00119Search in Google Scholar PubMed
5. Bolstad N, Warren DJ, Nustad K. Heterophilic antibody interference in immunometric assays. Best Pract Res Clin Endocrinol Metab 2013;27:647–61.10.1016/j.beem.2013.05.011Search in Google Scholar PubMed
6. Bowen RA, Drake SK, Vanjani R, Huey ED, Grafman J, Horne MK. Markedly increased vitamin B12 concentrations attributable to IgG-IgM-vitamin B12 immune complexes. Clin Chem 2006;52:2107–14.10.1373/clinchem.2006.073882Search in Google Scholar PubMed
7. Beda-Maluga K, Pisarek H, Komorowski J, Swietoslawski J, Fuss-Chmielewska J, Winczyk K. Evaluation of hyperprolactinaemia with the use of the intervals for prolactin after macroforms separation. J Physiol Pharmacol 2014;65:359–64.Search in Google Scholar
8. Hattori N, Ishihara T, Yamagami K, Shimatsu A. Macro TSH in patients with subclinical hypothyroidism. Clin Endocrinol (Oxf) 2015;83:923–30.10.1111/cen.12643Search in Google Scholar PubMed
9. Remacha AF, Zapico E, Sarda MP, Rojas E, Simó M, Remacha J, et al. Immune complexes and persistent high levels of serum vitamin B12. Int J Lab Hematol 2014;36:92–7.10.1111/ijlh.12131Search in Google Scholar PubMed
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