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Normalized vitamin D metabolite concentrations are better correlated to pharmacological effects than measured
Darius Mason1, Paul J Donabella2, Daryl Nnani3
1Department of Pharmacy Practice, Albany College of Pharmacy & Health Sciences, 106 New Scotland Avenue, Albany, NY 12208, USA; Division of Nephrology & Hypertension, Albany Medical College, 25 Hackett Boulevard, Albany, NY 12208, USA; Department of Pharmacy Practice, Albany College of Pharmacy & Health Sciences, 106 New Scotland Avenue, Albany, NY 12208, USA; Division of Nephrology & Hypertension, Albany Medical College, 25 Hackett Boulevard, Albany, NY 12208, USA.
Background:
Vitamin D deficiency has been associated with a multitude of diseases, ranging from fractures to cancer. Nearly 99% of vitamin D metabolites are bound to proteins, altering the relationship between concentration and activity.
Methods & Results:
Normalized concentrations were calculated and validated using published data regarding the correlation of 25-hydroxyvitamin D with bone mineral density. In addition, healthy and kidney disease subjects were recruited for preliminary investigations. Use of the normalizing equations resulted in statistically significant improvements in the relationship between vitamin D metabolites and several markers of health status.
Conclusion:
Normalized concentrations are similar to clinically reported values and are easier to interpret than free or bioavailable concentrations, since their values match the range of measured total concentrations.
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