Intraindividual Variation in Plasma 25-Hydroxyvitamin D Measures 5 Years Apart among Postmenopausal Women
Cancer Epidemiology, Biomarkers & Prevention, 05/16/2012
Meng JE et al. – Reliability measures were moderately influenced by season of blood draw and vitamin D supplement use. There is moderate intraindividual variation in 25(OH)D concentrations over approximately five years. These data support the use of a one–time measure of blood 25(OH)D in prospective studies with ≤five years of follow–up.