Vitamin D, 25-Hydroxy
The standard vitamin D test β key for bone, immune, and energy health, and one of the most common deficiencies. One draw, results usually in 1β2 business days.
Vitamin D helps your body absorb calcium for strong bones, supports your immune system, and plays a role in mood and energy. Because much of it comes from sunlight, deficiency is very common β especially in winter or with limited sun exposure. The 25-hydroxy test is the standard measure of your vitamin D status.
Included Tests
What This Panel Measures
Who Should Get This Panel
- You get limited sun exposure or live in a northern climate
- You feel tired, low, or achy
- You have darker skin, which lowers vitamin D production
- You want to confirm your supplement dose is enough
- You want a routine wellness check
Conditions Screened
Related Symptoms
When to Get Tested
Any time; no fasting is required. Levels are typically lowest in late winter, so that's a common time to check. Retest a few months after starting or changing a supplement to confirm you've reached a healthy range.
Understanding Your Results
Results post to your secure online account usually in 1β2 business days, with your value and the reference range. Many people fall below the optimal range and benefit from supplementation and sunlight. Vitamin D rises slowly, so allow a couple of months before rechecking after a dose change.
Frequently Asked Questions
Do I need to fast?
How long until my level improves after supplementing?
Is this billed to insurance?
Pairs Well With β Same Blood Draw
Test centers donβt accept payment β you pay securely here; the lab just does the draw.
What happens after you order?
- 1Your lab order form & test code appear in your secure online account β with your test centerβs address.
- 2We send your lab requisition to the test center electronically.
- 3Walk in & get tested β tests usually take 5 minutes or less.