LabInformationLab tests, explained

Vitamin D Blood Test in California

Vitamin D Blood Test can be requested without a referral, and this overview covers what to expect. The vitamin D blood test measures the level of vitamin D in your blood. It is ordered to check for deficiency, which can affect bone health, and to monitor treatment. California residents in Pacific can request the vitamin d blood test online and choose a convenient collection point.

Sample type
blood
Category
Vitamin & Mineral
Turnaround
1-3 business days
Price
$118
Referral
Not required

The vitamin D blood test measures the level of vitamin D in your blood. It is ordered to check for deficiency, which can affect bone health, and to monitor treatment.

What it measures

  • 25-hydroxyvitamin D — The main form of vitamin D in the blood; used to assess overall vitamin D status.
  • 1,25-dihydroxyvitamin D — The active form; measured less often, usually for specific medical conditions.
  • Calcium — Often checked alongside vitamin D because vitamin D helps regulate calcium levels.
  • Phosphate — Sometimes measured because vitamin D affects phosphate balance.
  • Alkaline phosphatase — A bone enzyme that may be checked if bone health is a concern.

Who it is for

A clinician may order this test if you have symptoms of deficiency, such as bone pain or muscle weakness, or if you have conditions that affect vitamin D absorption. It is also used to monitor vitamin D levels during treatment.

Preparation

No fasting is required for a vitamin D blood test. Tell your clinician about any supplements you take, as they may affect results.

Results and what they mean

Results are reported as a number, typically in nanograms per milliliter (ng/mL). Your clinician will interpret the result based on your health history and other factors. This is general information, not medical advice; discuss your results with a qualified healthcare professional.

Requesting the Vitamin D Blood Test in California

Order online, choose a certified collection site in California, and review results through a secure portal. No referral is required, and orders are processed confidentially. With coastal metros, inland towns, and rural counties with very different access to testing, it pays to schedule your collection in advance.

Frequently asked questions

Do I need to fast for this test?

No, fasting is not required. You can eat and drink normally before the test.

How long does it take to get results?

Results are usually available within 1 to 3 business days.

What can affect my vitamin D test results?

Supplements, certain medications, and the time of year can affect your levels. Tell your clinician about anything you are taking.

Is this test covered by insurance?

Coverage varies by insurance plan and medical necessity. Check with your insurance provider.

Vitamin D Blood Test by city in California

All testing in California →   Full Vitamin D Blood Test guide →