Vitamins
Vitamin D, 25-Hydroxy
The main blood marker used to assess vitamin D status.
vitaminsbonemineralsnutrition
About this biomarker
25-hydroxy vitamin D is the storage form measured in blood testing. It is the standard test used to estimate vitamin D status.
Why it matters
Vitamin D status affects calcium balance, bone health, and other body functions.
What lower levels may suggest
Low vitamin D may be seen with low sun exposure, low intake, malabsorption, or other causes.
What higher levels may suggest
High vitamin D may occur with excess supplementation and can affect calcium levels.
Common tests
25-hydroxy vitamin D, vitamin D panel
Related biomarkers
Your trend
Loading your results…