Vitamin D Index (Serum)
This test measures your blood levels of vitamin D, an important nutrient for bone health and overall well-being.
["Vitamin D helps maintain strong bones and supports immune function."]
Key facts at a glance
- LOINC
- 96960-0
- Short code
- VZV IgM Index Ser+CSF-aCnc
- Synonyms
- VZV IgM Index Ser+CSF-aCnc
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 82784
- 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 doctor may order this test if you have symptoms like fatigue, muscle weakness, or bone pain, or if you’re at higher risk for vitamin D deficiency (e.g., limited sun exposure, certain medical conditions, or dietary habits). It can also be part of routine check-ups for adults over 50 or those with chronic conditions like osteoporosis.
What to Expect Before the Test
No special preparation is needed, but you may be asked to fast for 8–12 hours before the blood draw if your doctor specifies it. Wear comfortable clothing and plan to sit quietly for a few minutes while the blood is drawn from a vein in your arm.
What Happens During the Test?
A healthcare professional will insert a small needle into your arm to collect a blood sample. You may feel a slight pinch, but the procedure usually takes less than five minutes. The blood will be sent to a lab for analysis.
What Are the Results Meaning?
Results help determine if your vitamin D levels are adequate, insufficient, or deficient. Low levels may indicate a need for dietary changes, supplements, or further medical evaluation, depending on your symptoms and overall health.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Vitamin D deficiency can lead to weakened bones (osteoporosis), increased risk of fractures, muscle pain, or weakened immunity. It’s also linked to other health issues like certain cancers and heart disease. Your doctor will interpret results in the context of your medical history and other tests.
Short name
Vitamin D Level
Frequently asked questions
How long does it take to get my results?
What if my vitamin D level is low?
Can I eat or drink anything before the blood test?
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