An isotope dilution-liquid chromatography-tandem mass spectrometry-based candidate reference measurement procedure for the quantification of 5-alpha-dihydrotestosterone in human serum and plasmaLea Lewinon January 24, 2026 at 11:00 am

Clin Chem Lab Med. 2026 Jan 26. doi: 10.1515/cclm-2025-1155. Online ahead of print. ABSTRACT OBJECTIVES: 5α-dihydrotestosterone (DHT) is a potent androgen, related to male sexual development and irreversibly synthesized from testosterone via 5α-reductase. Dysfunctions in the 5α-reductase system, locally or globally, can have substantial health impacts; measurement of both DHT levels and the testosterone-DHT ratio … Read more

Biological variation and inter-relation between key calcium homeostasis biomarkersNora Alicia Guldhaugon January 23, 2026 at 11:00 am

Clin Chem Lab Med. 2026 Jan 26. doi: 10.1515/cclm-2025-1225. Online ahead of print. ABSTRACT OBJECTIVES: This study aims to explore the biological variability of calcium homeostasis biomarkers, including calcium, phosphate, magnesium, 25-OH vitamin D, 1,25-OH vitamin D, and parathyroid hormone (PTH), and to develop a model that predicts PTH concentrations based on these parameters. METHODS: … Read more

An isotope dilution-liquid chromatography-tandem mass spectrometry-based candidate reference measurement procedure for the quantification of voriconazole in human serum and plasmaMarie Kubicovaon January 23, 2026 at 11:00 am

Clin Chem Lab Med. 2026 Jan 26. doi: 10.1515/cclm-2025-1371. Online ahead of print. ABSTRACT OBJECTIVES: Voriconazole is an antifungal agent measured in serum and plasma for therapeutic drug monitoring. This study aimed to develop a robust isotope-dilution liquid chromatography-tandem mass spectrometry (ID-LC-MS/MS) reference measurement procedure (RMP) to ensure accurate and reliable quantification in compliance with … Read more

Comparison of six serum analyte workflows using routine liquid chromatography-tandem mass spectrometry methods at multiple laboratories with the Cobas i 601 analyzer, an automated mass spectrometry systemPieter Vermeerschon January 23, 2026 at 11:00 am

Clin Chem Lab Med. 2026 Jan 26. doi: 10.1515/cclm-2025-0994. Online ahead of print. ABSTRACT OBJECTIVES: Liquid chromatography-tandem mass spectrometry (LC-MS/MS) offers substantial analytical advantages over traditional immunoassay methods, including greater specificity and robustness. Conventional LC-MS/MS methods are labor-intensive, requiring highly trained, dedicated laboratory staff. The Cobas® i 601 analyzer (Roche Diagnostics International Ltd., Rotkreuz, Switzerland) … Read more

An isotope dilution-liquid chromatography tandem mass spectrometry-based candidate reference measurement procedure for the quantification of dehydroepiandrosterone in human serum and plasmaLea Lewinon January 21, 2026 at 11:00 am

Clin Chem Lab Med. 2026 Jan 22. doi: 10.1515/cclm-2025-1156. Online ahead of print. ABSTRACT OBJECTIVES: Dehydroepiandrosterone (DHEA) is a steroid prohormone and important precursor for estrogen and testosterone biosynthesis. For differential diagnosis of sexual development disorders (e.g., polycystic ovary syndrome, congenital adrenal hyperplasia), accurate measurement of DHEA in clinical testing is essential. To address that … Read more

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