Lab test
Vitamin D 25-Dihydroxy (Calcitriol) Test
Below is a plain-language overview of the vitamin d 25-dihydroxy (calcitriol) test. This blood test measures the level of vitamin D in your body. It helps assess vitamin D status and is important for bone health.
What this test is
The Vitamin D 25-Dihydroxy test, also known as calcitriol testing, measures the main form of vitamin D found in the blood. This form indicates how much vitamin D your body has stored.
What it measures
- 25-Dihydroxyvitamin D — reflects vitamin D levels in the body
What the test involves
This test is performed on a blood sample. A healthcare professional will draw blood from a vein in your arm using a needle.
Why it is often ordered
Clinicians often order this test to check for vitamin D deficiency or to monitor conditions related to calcium and bone metabolism. It can also be used to assess kidney function.
Preparation
Follow any specific instructions provided by the laboratory for sample collection. Some tests may require fasting, while others do not.
How results are reported
Results are typically reported within a few business days. Your laboratory will provide a reference range, which is a set of values considered normal for healthy individuals.
Before you go
- Specific preparation instructions
- Typical turnaround time
- How to interpret your results
FAQ
Frequently asked questions
What is vitamin D?
Vitamin D is a fat-soluble vitamin that plays a crucial role in calcium absorption and bone health. It is produced in the skin when exposed to sunlight and can also be obtained from certain foods and supplements.
Why is vitamin D important?
Adequate vitamin D levels are essential for maintaining strong bones and teeth. It also supports immune function and may play a role in other bodily processes.
What can cause low vitamin D levels?
Low vitamin D can result from insufficient sun exposure, inadequate dietary intake, certain medical conditions affecting absorption, or some medications.
Can I take vitamin D supplements before the test?
It is best to follow the specific preparation instructions from your laboratory. If you are taking vitamin D supplements, inform the healthcare provider ordering the test.
Related
Related tests
Locations
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