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We report on a rare case of intravenous Cr(VI) poisoning and its impact on the scientific understanding of chromium toxicokinetics and red blood cells\u2019 (RBCs\u2019) lifespan in the human body. The approximate amount of injected chromium was between 0.33 and 0.66\u00a0g. Laboratory findings were collected over a half-year period from the time of injection. We monitored kidney function, liver function, RBC parameters, and chromium concentration in RBCs, plasma, and urine. In all samples, the total chromium concentration was quantified by inductively coupled plasma-mass spectrometry. By injecting Cr(VI) into his vein, the patient inadvertently labeled all his RBCs with chromium. This gave us the unique opportunity to calculate the RBC lifespan rather than just to estimate it. Based on RBC breakdown rates, the average lifespan was calculated to be 111 days, and the maximum lifespan to be 141.4 days. At about 24 weeks post-injection, the RBC chromium concentration approached background-exposure values, whereas chromium in plasma reached a plateau considerably higher than the reference value. These results confirm that there is a long-term storage compartment for chromium in the human body, which releases chromium into plasma but leaves the RBC chromium concentration unaffected. Therefore, this singular case of Cr(VI) poisoning provides us with the long-awaited scientific proof that chromium in the RBC fraction is a specific monitoring parameter for exposure to the carcinogen Cr(VI) in occupational and environmental settings.<\/jats:p>","DOI":"10.1007\/s00204-025-04247-1","type":"journal-article","created":{"date-parts":[[2025,12,8]],"date-time":"2025-12-08T19:19:34Z","timestamp":1765221574000},"page":"909-916","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["In-vivo toxicokinetics of chromium in human blood and urine after intravenous injection of chromate"],"prefix":"10.1007","volume":"100","author":[{"given":"Sonja","family":"Kilo","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-9225-6533","authenticated-orcid":false,"given":"Anna","family":"Wolfschmidt","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Florian Tobias","family":"Nickel","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrea","family":"Kaifie","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thomas","family":"G\u00f6en","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hans","family":"Drexler","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,12,8]]},"reference":[{"key":"4247_CR1","doi-asserted-by":"publisher","unstructured":"Bergant M, \u0160\u010dan\u010dar J, Mila\u010di\u010d R (2020) Kinetics of interaction of Cr(VI) and Cr(III) with serum constituents and detection of Cr species in human serum at physiological concentration levels. 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Ethical approval was waived by the local Ethics Committee of Friedrich-Alexander-Universit\u00e4t Erlangen-N\u00fcrnberg in view of the retrospective nature of the case study and all the procedures being performed were part of the routine care.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}}]}}