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25-hydroxyvitamin D [25(OH)D] assays are characterized by poor between-assay comparability. This result emphasizes the need for reference measurement procedures (RMPs) to establish calibration traceability and assist in method validation. We aimed at developing candidate RMPs on the basis of isotope- dilution liquid chromatography-tandem mass spectrometry (ID-LC-MS/MS) for separate quantification of serum 25(OH)D2 and 25(OH)D3.

clinical chemistry

Candidate Reference Measurement Procedures for Serum 25-Hydroxyvitamin D3 and 25-Hydroxyvitamin D2 by Using Isotope-Dilution Liquid Chromatography–Tandem Mass Spectrometry