Background The most reliable assessment of vitamin D status is measurement of plasma 25-
hydroxyvitamin D (25 [OH] D) concentration. High variability in 25 (OH) D measurements …

BACKGROUND: Historically, methodological differences and lack of standardization led to
between-laboratory variability in 25 (OH) D results. Recent observations raised concern …

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 …

Background: The concentration of 25-hydroxyvitamin D [25 (OH) D] in serum has been
designated the functional indicator of vitamin D (VitD) nutritional status. Unfortunately …

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 …

OBJECTIVES: The performance of recently developed vitamin D total assays (ADVIA
Centaur and Elecsys) was compared to that of liquid chromatography–tandem mass …

Context: Measurement of circulating 25-hydroxy-vitamin D [25 (OH) D]) is the accepted
clinical indicator of vitamin D status. However, between-laboratory differences in …

BACKGROUND 1α, 25-dihydroxy vitamin D [1, 25 (OH) 2D] is the active metabolite of
vitamin D. Antibody-based detection methods lack specificity, but when combined with …

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 …

OBJECTIVES: To compare two new automated assays with the well-established reference
method, DiaSorin radioimmunoassay (RIA), for quantitation of serum total 25-hydroxyvitamin …