Accuracy evaluation of calibrator value assignment in 25-hydroxyvitamin D LC-MS/MS assays: a metrological traceability-based study
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H Sun, Q Li
Clinical Chemistry and Laboratory Medicine (CCLM …, 2026
degruyterbrill.com
25-Hydroxyvitamin D (25 (OH) D) is a key biomarker for vitamin D status, and accurate measurement is essential for clinical decision-making [1]. Liquid chromatographytandem mass spectrometry (LC-MS/MS) is widely regarded as the reference method for 25 (OH) D measurement [2], yet routine testing in many laboratories still depends on commercial LC-MS/MS kits whose calibrators are claimed to be traceable to higher-order reference materials. Because calibrator value assignment is a critical link in the metrological …
