Vitamin D, 25-Hydroxy (Vitamin D)
Vitamin D level
What This Test Measures
This test measures the amount of vitamin D in your blood, which is important for bone health, immune function, and overall health.
Normal Reference Ranges
| Gender | Age Range | Normal Range | Unit |
|---|---|---|---|
| All | All ages | 30.0000 - 100.0000 | ng/mL |
Understanding Your Results
High
What it means: Your vitamin D level is higher than necessary (above 100 ng/mL). Very high levels can be harmful.
Common causes: Excessive supplementation (often over 10,000 IU daily for extended periods).
Next steps: Your doctor will likely recommend stopping or reducing vitamin D supplements and may check calcium levels.
Low
What it means: Your vitamin D level is low (below 30 ng/mL), which can affect bone health and immune function.
Common causes: Limited sun exposure, dark skin, obesity, malabsorption disorders, kidney/liver disease, or inadequate dietary intake.
Next steps: Your doctor will likely recommend vitamin D supplementation (often 1,000-2,000 IU daily or higher doses if severely deficient) and may investigate underlying causes.
Normal
What it means: Your vitamin D level is adequate for bone health and overall wellness.
Common causes: Adequate sun exposure, diet with vitamin D-rich foods, or supplementation.
Next steps: Continue current habits. Maintain safe sun exposure and consider dietary sources of vitamin D.
Medical Disclaimer
This information is for educational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Lab test results should always be interpreted by a qualified healthcare provider in the context of your complete medical history and current health status. Reference ranges may vary between laboratories. Always consult your doctor about your specific results.