Each invidual research lab provide their results. whether those are true in the population you want to study is entirely different matter. serum Vit D levels are affected by several variables. being a fat soluble vitamin dietary fat, calcium influences the absorbtion of vit D in the digestive tract. In the serum/blood compartment the carrier protein Vit D binding protein levels will further control the ratio between free and bound forms, ultimately affecting the transport of the vitamin to the the receptor. http://www.ncbi.nlm.nih.gov/pubmed/21844098
I would recommend you read Batai et al. Hum Genet. 2014 Nov;133(11):1395-405
VDR 2228570 C > T (FokI) and VDR 1544410 A > G (BsmI) gene polymorphisms
Genetic variation at 4p12, 11q12 and 11p15 loci identifies individuals who have substantially raised risk of vitamin D insufficiency (Wang et al., 2010).
Wang TJ, Zhang F, Richards JB, Kestenbaum B, van Meurs JB, Berry D et al. Common Genetic Determinants of Vitamin D Insufficiency: a Genome-Wide Association Study. Lancet 2010; 376(9736): 180-188.
Common genetic determinants of vitamin D insuffi ciency:
a genome-wide association study. search it
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