Serum or plasma concentration of vitamin D (25-hydroxyvitamin D)
This test measures the amount of vitamin D in your blood, which helps your body absorb calcium and maintain bone health. Low levels may indicate deficiency, while high levels could signal overabsorption or other conditions.
["Vitamin D levels help assess bone health and overall nutrient status."]
Key facts at a glance
- LOINC
- 96537-6
- Short code
- CEVIGM
- Synonyms
- CEV IgM Spec Ql IA
- Category
- chemistry
- Sample
- serum
- Container
- Serum separator tube (SST) or red-top tube
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- Enzyme Immunoassay (EIA)
- CPT
- 86651
- SNOMED
- 39529009
- Specimen volume
- 1-2 mL serum
- Stability
- Serum stable for 7 days at 2-8°C; for longer storage, freeze at -20°C or below
- Hemolysis max
- 100
- Lipemia max
- 100
- Icterus max
- 50
- TAT
- 24–72 hours
- Order
- routine
Why Is This Test Done?
Your healthcare provider may order this test to check if you have enough vitamin D, which is important for bone strength, immune function, and muscle health. It’s often done if you have symptoms like muscle weakness, frequent infections, or conditions like osteoporosis.
What to Expect Before the Test
No special preparation is needed unless instructed. You may fast before the test if directed, but always follow your provider’s advice. Bring any medications you’re taking, as some can affect vitamin D levels.
What Happens During the Test?
A small needle will draw blood from a vein in your arm. The process is quick and usually causes only mild discomfort. The blood sample is sent to a lab for analysis.
What Are the Possible Results?
Results are reported as a concentration of vitamin D in the blood, measured in nanograms per milliliter (ng/mL). Your provider will interpret the results in relation to your health and symptoms.
Reference range
Negative: No California encephalitis virus IgM antibodies detected. Positive: IgM antibodies to California encephalitis virus detected, suggesting recent or current infection.N/A
No fasting or special preparation required. Specimen should be collected during the acute phase of illness for optimal IgM antibody detection.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
Vitamin D level
Frequently asked questions
How long does it take to get my results?
What does a low vitamin D level mean?
Can vitamin D levels change over time?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 15, 2026. · Read our editorial policy