Quick Facts
- Sample: Blood
- Fasting: No special preparation required
- Turnaround: 2-3 days. May take longer based on weather, holiday, or lab delays.
What This Test Measures
The Vitamin D 25-Hydroxy Blood Test measures the level of Vitamin D, 25-Hydroxy in your blood. This form is often referred to as 25-Hydroxycalciferol, 25-OH-D, or a cholecalciferol metabolite, and is the primary circulating form of vitamin D used to evaluate your status.
This test reports a single biomarker, Vitamin D, 25-Hydroxy, from a blood specimen. Vitamin D plays a role in bone health, calcium regulation, and immune system function. This test reflects your current circulating level of this specific marker at the time your sample was collected.
Benefits
- Checks your circulating vitamin D, 25-hydroxy level
- Supports evaluation of bone health related factors
- Simple blood test with no special preparation
- Useful before starting osteoporosis drug therapy
- Fast turnaround for timely follow up with your provider
Who Is This Test For?
- Individuals with symptoms associated with vitamin D deficiency
- Those preparing to begin osteoporosis drug therapy
- People with limited sun exposure or who are homebound
- Individuals with obesity or reduced fat absorption
- Those who have undergone gastric bypass surgery
- People with conditions like cystic fibrosis or Crohn's disease
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 your circulating level of Vitamin D, 25-Hydroxy, a metabolite used to evaluate vitamin D status. It may help a healthcare provider assess whether your vitamin D level falls within an expected range. This test does not by itself diagnose a deficiency or excess.
2. Who would benefit from this test?
Individuals with symptoms that may relate to low vitamin D, or those with limited sun exposure, obesity, or conditions affecting fat absorption, may consider this test. It may also be useful for those preparing to start osteoporosis drug therapy. A healthcare provider can help determine appropriateness.
3. When should I order this test?
You may consider this test if you experience symptoms associated with vitamin D deficiency, have limited sun exposure, or are preparing to begin osteoporosis drug therapy. This test does not replace a full medical or nutritional evaluation by your healthcare provider.
4. How does this test differ from other nutritional tests?
This test measures one specific analyte, Vitamin D, 25-Hydroxy, from a blood specimen. It is not a panel and does not include other vitamins, minerals, or nutritional markers. Blood based results should not be treated as interchangeable with other specimen types for nutritional testing.
5. Do I need to fast before this test?
No special preparation is required for this test.
6. How quickly will I get results?
Results are typically available in 2-3 days. This may take longer based on weather, holidays, or lab delays.
7. How do I interpret the results?
The meaning of your Vitamin D, 25-Hydroxy result depends on factors such as your symptoms, medical history, sun exposure, diet, supplements, and other laboratory findings. A low result does not automatically confirm a deficiency, and a normal result does not rule out a nutritional concern. Your provider may consider this result alongside other laboratory findings.
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.
8. 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 whether additional evaluation or testing is appropriate based on your individual health history. This test result alone does not provide a complete clinical conclusion.
9. How often should I get tested?
Testing frequency should be determined as directed by your healthcare provider based on your individual circumstances and health history.
Pre test preparation
No special preparation required.
