The Vitamin D Test measures the level of vitamin D in your blood. Vitamin D is essential for maintaining healthy bones by helping your body absorb calcium. It also supports immune function and overall health.
To check for vitamin D deficiency or insufficiency
To evaluate bone disorders such as osteoporosis or rickets
To investigate symptoms like bone pain, muscle weakness, or frequent fractures
To monitor vitamin D levels during supplementation
Sample Required:
A blood sample
Fasting Required:
Fasting is not usually required.
| Vitamin D (25-hydroxyvitamin D) | Level |
|---|---|
| Deficient | < 20 ng/mL (or < 50 nmol/L) |
| Insufficient | 20–29 ng/mL (50–74 nmol/L) |
| Sufficient | 30–100 ng/mL (75–250 nmol/L) |
Low vitamin D levels may lead to bone disorders and increased risk of fractures
Adequate levels support bone health and immune function
Excessively high levels can cause toxicity (rare)









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