{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T01:55:31Z","timestamp":1787018131182,"version":"build-2736575974"},"reference-count":8,"publisher":"Croatian Society for Medical Biochemistry and Laboratory Medicine","issue":"3","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Biochem. med. (Online)"],"published-print":{"date-parts":[[2025,10,15]]},"abstract":"<jats:p>Spurious elevations in intact parathyroid hormone (iPTH) can lead to unnecessary interventions. We describe a dialysis patient who developed unexpectedly high iPTH concentrations months after total parathyroidectomy with forearm autotransplantation (TPTX-AT). Blood samples had been collected from the grafted forearm, resulting in falsely elevated iPTH values. Once the sample was collected from the non-grafted arm, iPTH concentrations normalized. This case highlights the importance of sampling site awareness in laboratory diagnostics and demonstrates how implementing a simple laboratory information system (LIS)-based protocol can prevent misinterpretation.<\/jats:p>","DOI":"10.11613\/bm.2025.031002","type":"journal-article","created":{"date-parts":[[2025,10,15]],"date-time":"2025-10-15T08:27:12Z","timestamp":1760516832000},"page":"469-472","source":"Crossref","is-referenced-by-count":1,"title":["Preanalytical mystery: falsely elevated intact parathyroid hormone due to sampling from a grafted forearm"],"prefix":"10.11613","volume":"35","author":[{"given":"Yu-Wei","family":"Tseng","sequence":"first","affiliation":[{"name":"Division of Laboratory Medicine, Asia University Hospital, Asia University","place":["Taichung, Taiwan"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chun-Chieh","family":"Yeh","sequence":"additional","affiliation":[{"name":"Department of Surgery, Asia University Hospital","place":["Taichung, 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