Background The ability to measure 25-hydroxyvitamin D (25OHD) levels from blood spot
cards can simplify sample collection versus samples obtained by venipuncture, particularly …

Background The current millennium has seen an explosion in vitamin D testing with the
overarching aim of requests to clinically stratify patients as replete or deficient in vitamin D …

Context: Recognition that vitamin D might be associated with many chronic diseases has led
to large-scale epidemiological and clinical studies. Dried blood spots (DBS) are a useful …

Previous studies have assessed vitamin D status based on the 25-hydroxyvitamin D [25
(OH) D] concentration measured in samples from dried blood spots (DBSs). In 40 individuals …

ABSTRACT Background: The Vitamin D Standardization Program (VDSP) has developed
protocols for standardizing procedures of 25-hydroxyvitamin D [25 (OH) D] measurement in …

BACKGROUND: Low levels of 25 hydroxyvitamin D (25OHD) during early development is
associated with a range of adverse health outcomes. While a number of methods exist to …

This study compared 25-hydroxyvitamin D [25 (OH) D] measurements in capillary and
venous blood samples collected, respectively by fingerprick and venipuncture. Capillary …

Background Venous blood is the usual sample for measuring various biomarkers, including
25-hydroxyvitamin D (25OHD). However, it can prove challenging in infants and young …

Variations in vitamin D quantification methods are large and influences of vitamin D
analogues and blood collection methods have not been systematically examined. We …

Vitamin D is a fat-soluble vitamin that is synthesized in the skin with exposure to sunlight or
is ingested from dietary supplements or food. There has been a dramatic increase in …