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Vitamin D Metabolites: Analytical Challenges and Clinical Relevance.
N Alonso1, S Zelzer1, G Eibinger1
1Clinical Institute of Medical and Chemical Laboratory Diagnostics, Medical University of Graz, Graz, Austria.
Calcified Tissue International
|March 3, 2022
Summary
New insights into vitamin D metabolism reveal that while 25(OH)D is standard for deficiency diagnosis, other metabolites like 24,25(OH)2D offer functional insights. Further research is needed for broader clinical application of these vitamin D biomarkers.
Area of Science:
- Endocrinology and Metabolism
- Clinical Chemistry
- Biomarker Discovery
Background:
- Vitamin D metabolism research has advanced, identifying new biomarkers beyond routine clinical measurements.
- Current clinical practice primarily relies on 25(OH)D for deficiency diagnosis and 1,25(OH)2D for specific metabolic disorders.
- Emerging biomarkers like 24,25(OH)2D, free/bioavailable 25(OH)D, and the vitamin D metabolite ratio (VMR) show potential but face analytical and clinical data limitations.
Purpose of the Study:
- To review established and novel vitamin D biomarkers, detailing their roles, analytical methods, and clinical utility.
- To highlight the potential of advanced vitamin D metabolite analysis for a comprehensive understanding of vitamin D status.
- To identify research gaps and future directions for the clinical application of vitamin D biomarkers.
Main Methods:
- Review of current literature on vitamin D metabolism and biomarker analysis.
- Focus on Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS) as the preferred analytical technique for high sensitivity and specificity.
- Evaluation of preanalytical and analytical aspects, pathophysiological roles, and clinical indications of various vitamin D metabolites.
Main Results:
- LC-MS/MS enables accurate parallel measurement of multiple vitamin D metabolites.
- Combined analysis of 25(OH)D and 24,25(OH)2D offers a functional assessment of vitamin D metabolism.
- Challenges remain in standardizing assays and gathering sufficient clinical data for VDBP, free/bioavailable 25(OH)D, and VMR.
Conclusions:
- Standardization of analytical methods and further clinical validation are crucial for incorporating new vitamin D biomarkers into practice.
- While 25(OH)D is key for deficiency, exploring metabolites like 24,25(OH)2D can provide deeper insights into vitamin D's functional role.
- Future research should prioritize addressing analytical hurdles and expanding clinical evidence to fully leverage the diagnostic and prognostic potential of vitamin D biomarkers.
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