25（OH）-D is a prehormone that is produced in the liver by hydroxylation of vitamin D3 (cholecalciferol) by the enzyme cholecalciferol 25-hydroxylase. Physicians worldwide measure this metabolite to determine a patient's vitamin D status.

Advantages

1.Easy to Use
2.Room Temperature Storage
3.Wide Detection Range
4.Different Specifications to Meet Different Needs

Clinical Significance

A low result may also mean your body is having trouble using the vitamin as it should, and may indicate kidney or liver disease. A vitamin D deficiency is usually treated with supplements and/or dietary changes.
If your results show you have an excess of (too much) vitamin D, it is most likely due to taking too many vitamin pills or other supplements. You’ll need to stop taking these supplements to reduce your vitamin D levels.  Too much vitamin D can cause damage to your organs and blood vessels