Vitamin D, 25-OH
The active storage form of vitamin D, essential to immune, bone, and mood health.
Blood draw
24 hrs
Physician-reviewed
What this panel measures
- 25-hydroxy vitamin D — the storage form that best reflects your vitamin D status
Why providers order it
- Fatigue, low mood, or frequent illness
- Bone health and osteoporosis risk
- Limited sun exposure, darker skin, or northern winters
- Monitoring the dose of a vitamin D supplement
No fasting or special preparation required.
Vitamin D, 25-OH: frequently asked questions
What is a normal vitamin D level?
Most guidelines consider 30 ng/mL and above sufficient, with 30–50 ng/mL a common target range. Your provider interprets your level alongside bone health and other risk factors.
Why test instead of just supplementing?
Vitamin D is fat-soluble and stored by the body, so excess builds up rather than flushing out. Testing confirms whether you need a supplement, and at what dose, and whether your current dose is working.
How long do results take?
Vitamin D results are typically reported within 24 hours and physician-reviewed before release.
Often ordered together
This page is educational and does not replace medical advice. Testing decisions should be reviewed with a licensed provider.