Vitamin D Level Reference Guide
Understand your vitamin D (25-hydroxy vitamin D) test result and what each level means for your bones and health.
The Vitamin D Level Reference Guide is being built
This free reference guide will appear here shortly. Meanwhile, the formula and ranges below show exactly how it works.
- Vitamin D result
- Unit (ng/mL or nmol/L)
- Deficient / insufficient / sufficient / high
- Converted value
About the Vitamin D Level Reference Guide
Despite plenty of sunshine, vitamin D deficiency is very common in India because of indoor lifestyles, clothing and skin type.
Reference ranges & how it works
Widely used ranges (Endocrine Society) for 25(OH)D:
Below 20 ng/mL — deficient · 21–29 ng/mL — insufficient · 30–100 ng/mL — sufficient · above 150 ng/mL — risk of toxicity
nmol/L = ng/mL × 2.496
Frequently asked questions
What are the symptoms of low vitamin D?
Many people have none. Others notice tiredness, bone or back pain, muscle weakness and frequent infections.
How much sunlight do I need?
Around 15–30 minutes of midday sun on arms and legs a few times a week helps, but many people still need supplements. Your doctor will advise a dose.
Medical disclaimer: These tools give general information and estimates only. They are not a diagnosis and do not replace advice from a qualified doctor. Always talk to your doctor about your results, and seek urgent medical help in an emergency.