Introduction 25-hydroxyvitamin D (25OHD) determination is of diagnostic importance for the
investigation of vitamin D deficiency and much more rarely, intoxication. Despite the name …

Vitamin D deficiency is a common health problem, and healthcare providers frequently
measure circulating 25-hyroxyvitamin D concentration, the accepted standard for clinical …

Background: Over the last decade, clinical interest to evaluate human 25-hydroxy-vitamin D
(25 [OH] D) serum levels has increased exponentially. In the present study, four …

Vitamin D deficiency is an important concern, but assays for serum 25-hydroxy vitamin D (25-
OH-D), 1 the accepted marker for vitamin D nutritional status, are not standardized. A quick …

Objectives The ability of current immunoassays to accurately measure equimolar amounts of
25 (OH) D 2 and 25 (OH) D 3 has been recently questioned. This study determined serum …

Abstract BACKGROUND 24, 25-Dihydroxyvitamin D [24, 25 (OH) 2D] in serum may be both
a nuisance and nutritionally valuable. METHODS We investigated the impact of 24, 25 (OH) …

The First International Conference on Controversies in Vitamin D was held in Pisa, Italy, 14–
16 June 2017. The meeting's purpose was to address controversies in vitamin D research …

In their article in the current issue of Clinical Chemistry, Farrell et al.(1) describe the latest in
a number of studies (2, 3) highlighting the method-related variability in serum 25 …

In this review we describe procedures, performance characteristics and limitations of
methods available for the measurement of 25-hydroxyvitamin (25OHD) since the year 2000 …

Background: Clinical demand for quick, cheap, precise and accurate 25-hydroxyvitamin D
(25 (OH) D) results has led to the development of a variety of assay methods. Lack of …