Free Vitamin D ELISA

Instead of Total Vitamin D levels, our Free 25OH Vitamin D ELISA measures the concentration of its free form. This provides more accurate assessment of Vitamin D status in several conditions, including pregnancy, liver disease, renal disease and intensive care.

Free 25OH Vitamin D: a new level of Vitamin D measurement

Our patented free 25OH Vitamin D ELISA is a CE-IVD marked, competitive two-step ELISA immunoassay. It allows a direct measurement of free 25OH Vitamin D in serum and makes the calculation method obsolete. The assay is calibrated against a symmetric dialysis method. Above all, it shows excellent performance characteristics such as Limit of Detection, and precision determined according the CLSI guidelines.


The Free 25OH Vitamin D ELISA is distributed by DIAsource ImmunoAssays.

The Instructions for Use are available here

Download IFU & MSDS