The Vitamin D Test, Explained in Plain Language
Quick Answer (TL;DR)
The standard test measures 25-hydroxyvitamin D in your blood, the best available marker of your vitamin D stores.
What It Means
Many labs treat below 30 nmol/L (12 ng/mL) as deficient and 50 nmol/L (20 ng/mL) or above as sufficient for bone health. Thresholds vary between countries and guidelines.
Why It Matters for Your Health
Low vitamin D affects calcium absorption and bone strength, and severe deficiency causes bone pain and muscle weakness. It is more likely with little sun exposure, darker skin, covering clothing, obesity and some gut conditions.
Recommended Biomarker or Metric to Track
Note your dose and the season alongside each vitamin D result.
Questions to Ask Your Doctor
Targeted questions based on latest clinical consensus statements.
Suggest a Medical or Clinical Correction
Healthovi content is continuously reviewed. If you notice outdated recommendations or clinical ambiguities, let our medical review board know.