Quick Facts
- Sample: Blood
- Fasting: No special preparation is required
- Turnaround: 6-10 business days (may take longer based on weather, holiday, or lab delays)
What This Test Measures
This test measures Vitamin D, 25-Hydroxy, using a blood sample. 25-hydroxyvitamin D is the form of vitamin D that circulates in your bloodstream after vitamin D from sun exposure, food, or supplements is processed by the liver. It is the primary form used to evaluate your vitamin D level.
This test is performed using LC/MS/MS methodology (LabCorp CPT code 82306). It reports a single circulating vitamin D value and does not measure any other vitamins, minerals, or nutritional markers.
Benefits
- Measures your circulating vitamin D, 25-hydroxy level
- Uses precise LC/MS/MS laboratory methodology
- Requires no special preparation before testing
- Supports monitoring related to bone health discussions
- Provides a result you can review with your provider
- Simple blood draw with no fasting needed
Who Is This Test For?
- People experiencing symptoms associated with low vitamin D
- People experiencing symptoms associated with elevated vitamin D
- Adults with limited sun exposure or higher risk factors
- People monitoring osteoporosis treatment with their provider
- People monitoring hypercalcemia treatment with their provider
- Individuals wanting a vitamin D level on record
How It Works
- Order Your Test Online
- Visit a Local Lab
- Get Results Online
FAQ
1. What is the purpose of this test?
This test measures the concentration of Vitamin D, 25-Hydroxy circulating in your blood using LC/MS/MS methodology. This measurement can help a healthcare provider evaluate your vitamin D level as part of a broader clinical picture. It does not, by itself, diagnose a vitamin D deficiency or vitamin D toxicity.
2. Who would benefit from this test, and when should I order it?
This test may be useful for individuals experiencing symptoms that could relate to low or high vitamin D, those with known risk factors for low vitamin D, or those monitoring osteoporosis or hypercalcaemia treatment with a healthcare provider. It is not intended for everyone with general nutrition questions and does not replace a full medical or nutritional evaluation.
3. Do I need to fast before this test?
No special preparation is required for this test.
4. How quickly will I get results?
Results are typically available in 6–10 business days, though this may take longer based on weather, holidays, or lab delays.
5. How do I interpret the results?
The meaning of your Vitamin D, 25-Hydroxy result depends on your individual symptoms, medical history, diet, supplement use, medications, and other laboratory findings. A low or high result does not, by itself, confirm a deficiency or toxicity, and a normal result does not rule out a nutritional concern. Your provider may consider this result alongside other relevant information.
Disclaimer: Reference ranges may vary by laboratory. Listed ranges are general guidelines and may differ from those used by the performing lab. Always consult your healthcare provider for interpretation.
6. What should I do if my results are abnormal?
If your results fall outside the expected range, review them with a qualified healthcare provider. They can help determine what the result means for you and whether additional evaluation is appropriate.
7. How often should I get tested?
Testing frequency should be determined as directed by your healthcare provider, based on your individual health needs and any ongoing monitoring, such as osteoporosis or hypercalcaemia treatment.
Pre test preparation
No special preparation is required.
