Serum or plasma concentration of vitamin D (25-hydroxyvitamin D)
This test measures your body’s level of vitamin D, an essential nutrient that helps your bones stay strong and supports overall health.
["Vitamin D levels help assess your risk for deficiencies and related health issues."]
Key facts at a glance
- LOINC
- 36789-6
- Short code
- MRA Pelvis vv
- Synonyms
- MRA Pelvis vv
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- mr-angio
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why Is This Test Done?
Your healthcare provider may order this test if you have symptoms of vitamin D deficiency, such as muscle weakness, bone pain, or frequent infections. It may also be recommended for people at higher risk, like those with limited sun exposure, certain medical conditions, or those who follow restrictive diets.
What to Expect Before the Test
No special preparation is needed for this blood test. You may have fasting instructions depending on your specific test, so follow your provider’s guidance. Bring any medications you’re currently taking to your appointment.
What Happens During the Test?
A healthcare professional will draw blood from a vein in your arm. You may feel a slight pinch, but it usually doesn’t cause discomfort. The blood will be sent to a lab for analysis.
What the Results Mean
Results will show your vitamin D concentration in the blood. While reference ranges vary by lab, low levels may indicate deficiency, while higher levels may suggest excess intake or metabolic issues. Your provider will interpret results in the context of your overall health.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Vitamin D deficiency can lead to weakened bones, increased risk of fractures, or weakened immune function. Chronic deficiency may also be linked to other health concerns like certain cancers or autoimmune diseases. Regular monitoring helps manage and prevent these risks.
Short name
Vitamin D Level
Frequently asked questions
How long does it take to get results?
What causes vitamin D deficiency?
Can I take supplements to boost my vitamin D levels?
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 16, 2026. · Read our editorial policy