Measurement of vitamin D in dried blood spots stored under different temperature conditions.

Background: As part of the Survey of Health, Ageing and Retirement in Europe (SHARE) study, dried blood spot samples were obtained for measurement of potential biological biomarkers, among those vitamin D. Unfortunately, no studies describe the impact of high temperatures on dried blood spot samples and vitamin D measurements.

Materials And Methods: Capillary samples were collected on dried blood spot cards from 40 outpatients (median age 78 years) along with venous blood samples.