The measurement of free 25-hydroxyvitamin D
Vitamin D status is currently assessed by measurements of total 25-hydroxyvitamin D [25(OH)D]. However, over 99% of circulating 25(OH)D is bound to protein, vitamin D binding protein in particular. The free hormone hypothesis stipulates that only the free form crosses the cell membrane to exert biologic action. Measurement of free 25(OH)D is now available. by […]
