Lab Tests for Vitamin D Deficiency
Vitamin D deficiency affects an estimated 42% of American adults and can cause fatigue, bone pain, muscle weakness, depression, and impaired immunity. Because symptoms develop gradually and overlap with many other conditions, a blood test is the only reliable way to know your vitamin D status. The 25-hydroxy vitamin D test is the standard measurement. With JustLabs, you can order this test online for $22 — no doctor visit or insurance required — and get results within 1-2 business days.
Recommended Tests
Understanding Your Results
| Test | Normal Range | Low Means | High Means |
|---|---|---|---|
| Vitamin D, 25-OH | 30–100 ng/mL | <20 = deficiency; 20-29 = insufficient | >100 ng/mL = toxicity risk (rare) |
| Calcium (CMP) | 8.5–10.5 mg/dL | May drop with severe vitamin D deficiency | Can indicate excess vitamin D supplementation |
How to Order
Order Online
Select your tests and pay securely. A licensed physician authorizes your order.
Visit Quest Diagnostics
Walk into any of 2,200+ Quest locations nationwide. No appointment needed.
Get Results
Results available in your account within 1-2 business days.
Frequently Asked Questions
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Content reviewed for accuracy by the JustLabs editorial team.