Monday, June 13, 2011

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Vitamin D - recommended level in blood, value for deficiency

The minimum recommended vitamin D level is 30 ng/mL but a range of 40-60 ng/mL has been put to guarantee sufficiency.
The vitamin D level actually refers to the level of 25-Hyhroxy-cholecalciferol i.e. 25[OH]D and not that of 1,25-Dihydroxy-cholecalciferol. 25[OH]D is the major storage form of vitamin D. Around 88% of it circulates bound to vitamin D-binding protein, 0.03% is free and rest circulates bound to albumin. It has a half life of around 2-3 weeks.
If this level is less than 20 ng/mL, it is considered as vitamin D deficiency.

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