DBSL generated data using DBS of Vitamin D3 levels in a population of Dutch health care professionals at two time points in 2014. Figure A shows data of 120 Dutch Pharmacists, DBS obtained on March 11th at the end of the winter period while Figure B shows Vitamin D3 levels of 246 Dutch Pharmacists, DBS obtained on October 7th at the end of the summer period.
The percentage of individuals with Vitamin D3 levels below 50 nmol/L (the upper limit of Vitamin D3 insufficiency according to the American Institute of Medicine report of 2010) reached at the end of the winter period a worrisome 41.6%! Although the summer of 2014 counted many hours of sunshine still 19.1% of the health care workers had insufficient Vitamin D levels.
The health care professionals sampled were attending their national convention meetings suggesting the tested population to be relatively representative for the population of Dutch Pharmacists.
In the Dutch Health Council report of 2012, a serum Vitamin D3 level of 30 nmol/L Vitamin D3 was stated to be limit of deficiency and 50 nmol/L the limit of insufficiency.