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Monoclonal \u03bb-type IgG was detected in the serum, resulting in a diagnosis of monoclonal gammopathy of undetermined significance. Previous studies indicated paraprotein interference in serum containing monoclonal IgM or a large amount of IgG (&gt; 25 g\/L). Although this case of paraprotein interference induced by a small amount of IgG is rare, a discrepancy in creatinine results may be an indicator leading to the diagnosis of plasma cell proliferative diseases.<\/jats:p>","DOI":"10.1136\/bcr-2023-256242","type":"journal-article","created":{"date-parts":[[2024,4,26]],"date-time":"2024-04-26T02:00:34Z","timestamp":1714096834000},"page":"e256242","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":1,"title":["Discrepant serum creatinine concentrations caused by paraprotein interference preceding diagnosis of monoclonal gammopathy of undetermined significance"],"prefix":"10.1136","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7597-8017","authenticated-orcid":false,"given":"Miyuki","family":"Kobara","sequence":"first","affiliation":[{"name":"Clinical Pharmacology, Kyoto Pharmaceutical University, Kyoto, Japan"},{"name":"Department of Cardiovascular Medicine, Graduate 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