Abstract
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.
Highlights
Vitamin D deficiency has been associated with a multitude of diseases, ranging from fractures to cancer
C Dn = C f + B1 $ C mn1 + B2 $ C mn2 where CDn is the normalized vitamin D metabolite concentration, Cf is the free vitamin D metabolite concentration, B1 is the number of molecules of vitamin D metabolite bound per molecule of albumin, B2 is the number of molecules of vitamin D metabolite bound per molecule of D binding protein (DBP), Cmn 1 is the normal concentration of albumin, and Cmn 2 is the normal concentration of DBP (5.7 μM in this article)
Normalized concentrations corresponding to free concentrations can be calculated using both albumin and DBP as binding proteins
Summary
Vitamin D deficiency has been associated with a multitude of diseases, ranging from fractures to cancer. 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. 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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