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The patient had the supratherapeutic trough gentamicin concentration of 2.5 mg\/L. eGFRcrea was 62 mL\/min\/1.73m2 and eGFRcys was 25 mL\/min\/1.73m2. The difference between eGFRcrea and eGFRcys was 148%. Falsely high eGFRcrea in elderly patient led to the supratherapeutic gentamicin concentration even after the standard 240 mg gentamicin dose.<\/jats:p>","DOI":"10.11613\/bm.2025.030902","type":"journal-article","created":{"date-parts":[[2025,8,7]],"date-time":"2025-08-07T07:19:41Z","timestamp":1754551181000},"page":"459-463","source":"Crossref","is-referenced-by-count":0,"title":["Cystatin C for gentamicin dosing"],"prefix":"10.11613","volume":"35","author":[{"given":"Tom\u00e1\u0161","family":"\u0160\u00e1lek","sequence":"first","affiliation":[{"name":"Department of Clinical Biochemistry and Pharmacology, Tomas Bata Hospital in Zl\u00edn","place":["Zl\u00edn, Czech Republic"]},{"name":"Institute of Clinical Biochemistry and Diagnostics, Medical Faculty in Hradec Kr\u00e1lov\u00e9, Charles University in Prague","place":["Prague, Czech 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