Key Takeaways
- Primary circulating form of Vitamin D measured in blood.
- Deficiency causes bone pain, fatigue, and lower immunity.
- Optimal levels support calcium absorption and muscle strength.
Vitamin D 25-OH reference levels: Deficiency (<20 ng/mL), Insufficiency (20–29 ng/mL), Sufficient (30–100 ng/mL).
Vitamin D 25-OH measures circulating Vitamin D reserves essential for bone density and muscle function.
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Medical Disclaimer
This article is intended strictly for educational purposes and should not be used as a substitute for professional medical diagnosis or clinical treatment.