A
new study concluded that the recommended daily allowance for vitamin D
is grossly inadequate for correcting low serum concentrations of
25-hydroxyvitamin D in many adult patients. About 5000 IU vitamin D3/day
is usually needed to correct deficiency, and the maintenance dose
should be ≥2000 IU/day. The required dose may be calculated from a
predictive equation.
For the whole population, average daily dose resulting in any increase
in serum 25-hydroxyvitamin D level was 4707 IU/day; corresponding values
for ambulatory and nursing home patients were 4229 and 6103 IU/day,
respectively. Significant factors affecting the change in serum
concentrations of 25-hydroxyvitamin D, in addition to the dose
administered, are (1) starting serum concentration of 25-hydroxyvitamin
D, (2) body mass index (BMI), (3) age, and (f) serum albumin
concentration.
The following equation predicts the dose of vitamin D
needed (in international units per day) to effect a given change in
serum concentrations of 25-hydroxyvitamin D: Dose = [(8.52 - Desired
change in serum 25-hydroxyvitamin D level) + (0.074 × Age) - (0.20 ×
BMI) + (1.74 × Albumin concentration) - (0.62 × Starting serum
25-hydroxyvitamin D concentration)]/(-0.002).
A predictive equation to guide vi... [J Am Board Fam Med. 2014 Jul-Aug] - PubMed - NCBI
www.ncbi.nlm.nih.gov
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