VITAMIN D INSUFFICIENCY – HOW IS THIS DEFINED?
The National Osteoporosis Society (NOS) state that in agreement with the Institute of Medicine (IOM), the following vitamin D thresholds are adopted by UK practitioners in respect to bone health1:
- Serum 25OHD < 30 nmol/L is deficient
- Serum 25OHD of 30-50 nmol/L may be inadequate in some people
- Serum 25OHD > 50 nmol/L is sufficient for almost the whole population
However, it has been argued that levels of at least 75 nmol/L are required to suppress PTH and bone turnover2
Also, it has been argued that serum vitamin D3 in the range of 50-80 nmol/L may be optimal for fracture prevention2
- National Osteoporosis Society (2016). Vitamin D and Bone Health: A Practical Clinical Guideline for Patient Management. Accessed online: www.nos.org.uk/document.doc?id=1352 (April 2016).
- European Food Safety Authority (2016). Scientific Opinion on Dietary Reference Values for vitamin D. EFSA Panel on Dietetic Products, Nutrition, and Allergies (NDA). EFSA Journal. Accessed online: www.efsa.europa.eu/en/press/news/160321a