Vitamin D, 25-Hydroxy
Test code: BCM0619
- Sample
- Blood
- Preparation
- No special preparation
- Report
- Within 3 Hours
- Processed
- Mon to Sun, by 06:00 PM
About this test
The Vitamin D (25-Hydroxy) test measures the main form of vitamin D stored in your body. Vitamin D helps your body absorb calcium and keeps your bones, muscles and immune system healthy. The test is used to find deficiency and to monitor supplements.
Preparation & sample
No special preparation required. You can eat and drink normally. Tell us if you take vitamin D or calcium supplements, including weekly or monthly doses.
What does this test measure?
It measures 25-hydroxy vitamin D, the form your liver makes from vitamin D you get from sunlight, food and supplements. It is the best single measure of your body's vitamin D status.
When should you get this test?
- Bone or joint pain, muscle weakness or cramps
- Constant tiredness or frequent infections
- Low bone density (osteopenia or osteoporosis) or repeated fractures
- Little sun exposure, for example if you work indoors all day or cover most of your skin
- Older age, obesity, pregnancy, or conditions that affect absorption (such as coeliac disease)
- Long-term use of medicines such as steroids or some anti-seizure drugs
- To check your level after a few months of supplements
Understanding your results
Many laboratories use these ranges (ng/mL):
| Level | What it usually means |
|---|---|
| Below 20 | Deficient |
| 20 to 29 | Insufficient |
| 30 to 100 | Sufficient |
| Above 100 | High; can be harmful if it continues |
Vitamin D deficiency is very common in India, even in sunny areas. Very high levels usually come from taking high-dose supplements for too long. Always follow your doctor's advice on the dose and duration of supplements.
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