What Does a Vitamin D Test Measure?
The vitamin D test measures 25-hydroxyvitamin D in your blood, which is the best indicator of your overall vitamin D status. Vitamin D is essential for calcium absorption, bone health, immune function, and mood regulation. Unlike most vitamins, your body produces vitamin D from sunlight exposure, making deficiency common in people with limited sun exposure.
How the Test Works
The Vitamin D test is performed via a standard blood draw at any Quest Diagnostics location. Your sample is sent to a CLIA-certified lab for analysis. Results are typically available within 1-2 business days in your JustLabs account.
Conditions It Helps Diagnose
Who Should Get Tested
Anyone with fatigue, bone pain, or depression; people with limited sun exposure; darker-skinned individuals; adults over 50; people who are overweight; and anyone taking vitamin D supplements to verify dosage.
Order your Vitamin D test — $22