The Vitamin D Test (Vitamin D 25 Hydroxy Test) is a blood test that measures the level of 25-Hydroxy Vitamin D in the body. It is the most commonly used test to evaluate vitamin D status and helps identify vitamin D deficiency or insufficiency, which can affect bone health, muscles, immunity, and overall wellbeing.
This test helps doctors determine whether a person has adequate vitamin D levels and whether supplementation or lifestyle changes may be required.
1.Vitamin D Total - 25 Hydroxy
Measures the level of 25-Hydroxy Vitamin D, the main stored form of vitamin D. It helps evaluate vitamin D status, bone health, muscle function and immunity.
Also known as: Vitamin D 25-OH Test, 25 Hydroxy Vitamin D Blood Test, Vitamin D Total Test, Vitamin D Level Test
The Vitamin D 25 Hydroxy Test measures the amount of stored vitamin D in the bloodstream. Vitamin D is an essential nutrient that helps the body absorb calcium and phosphorus, which are important for maintaining strong bones and healthy muscles.
The body produces vitamin D mainly through exposure to sunlight, while it can also be obtained from certain foods and supplements.
Low vitamin D levels are common and may contribute to problems such as bone weakness, muscle pain, fatigue, and increased risk of bone-related disorders.
The Vitamin D Test measures 25-Hydroxyvitamin D [25(OH)D], the main circulating form of vitamin D in the body.
Vitamin D plays an important role in:
The test helps determine whether vitamin D levels are:
Doctors may recommend a Vitamin D Test to:
The test may be advised if you experience:
Benefits of the Vitamin D Test:
A Vitamin D Test may be recommended for:
The Vitamin D Test requires a blood sample collected from a vein.
Before the test:
| Parameter | Normal range |
|---|---|
| Below 20 ng/mL | Vitamin D Deficiency |
| 20–29 ng/mL | Vitamin D Insufficiency |
| 30–100 ng/mL | Generally considered Sufficient |
| Above 100 ng/mL | May indicate Excess Vitamin D |
| Note | Reference ranges may vary between laboratories and medical guidelines. Vitamin D levels should be interpreted along with symptoms, health conditions, and doctor's advice. |
Reference ranges can differ between labs. Your report shows the range used by the lab.
A Vitamin D 25 Hydroxy Test is a blood test that measures the level of stored vitamin D in the body to assess vitamin D status.
No, fasting is usually not required for a Vitamin D blood test.
Low vitamin D levels indicate insufficient vitamin D stores and may affect bone strength, muscle function, and overall health.
Symptoms may include fatigue, muscle weakness, bone pain, low energy, and increased risk of bone-related problems.
| Test name | Vitamin D Test (Vitamin D 25 Hydroxy) |
|---|---|
| Location | Chennai |
| Sample type | Blood |
| Number of parameters | 1 |
| Home sample collection | Available |
| Fasting | Not required |
| Report time | Within 24–30 hours |
| Recommended age | 5–99 years |
| Suitable for | Male & Female |
Yes, sunlight exposure helps the skin produce vitamin D, although the amount produced depends on factors such as location, skin exposure, season, and individual health factors.
Testing frequency depends on your vitamin D status, supplementation plan, and doctor's recommendation.
Yes. Excessive vitamin D supplementation can lead to very high vitamin D levels and may affect calcium balance. Supplements should be taken according to medical advice.
