Am J Clin Pathol 2012;137:831-835 833 © American Society for Clinical Pathology The Author’s Reply I read with interest the comments by Arya and Agarwal who broadened the discussion of vitamin D testing into an international context and raised a number of important points. First, 25-hydroxyvitamin D testing is currently not accessible in many parts of the world owing to financial constraints or...

We determined the free fraction of 25-dihydroxyvitamin D (25OHD) in the serum of subjects with clinical evidence of liver disease and correlated these measurements to the levels of vitamin D binding protein and albumin. These subjects when compared to normal individuals had lower total 25OHD levels, higher percent free 25OHD levels, but equivalent free 25OHD levels. These subjects also had redu...

BACKGROUND Vitamin D deficiency has been associated with a multitude of diseases, ranging from fractures to cancer. Nearly 99% of vitamin D metabolites are bound to proteins, altering the relationship between concentration and activity. METHODS & RESULTS Normalized concentrations were calculated and validated using published data regarding the correlation of 25-hydroxyvitamin D with bone mine...

I t has been suggested that vitamin D reduces the risk of type 2 diabetes. The finding that vitamin D deficiency is associated with impaired -cell function and insulin resistance in animals (1,2) and humans (3,4) is in line with that hypothesis. In the only cohort study publ i shed , the in take of v i t amin D supplements was inversely associated with the development of type 2 diabetes (5). Si...

OBJECTIVES The study sought to determine the link between vitamin D concentrations and incident hypertension in prospective study and meta-analysis. METHODS The study was embedded in the Kailuan Study, a population-based cohort of adults that contains underground miners. In 2012, we studied 2,456 men and women free of prevalent hypertension, age 21 to 67 at baseline. Serum 25-hydroxyvitamin D...

An international 19-laboratory survey was organized to compare assays for 25-hydroxyvitamin D, 24,25-dihydroxyvitamin D, and 1,25-dihydroxyvitamin D in plasma. Each participant received two ethanolic standard solutions of each metabolite and eight plasma samples. Each laboratory used its usual procedures. Mean interlaboratory coefficients of variation (CVs) for the eight plasma samples were 35%...

BACKGROUND AND OBJECTIVES Vitamin D deficiency is frequent during the winter and occurs throughout the year in the elderly or patients suffering from autoimmune diseases. The objective of this study was to evaluate the pharmacokinetic properties of oral supplementation versus a single intramuscular injection of cholecalciferol in healthy individuals. RESEARCH DESIGN AND METHODS Up to 8,000 I....

Current observations link vitamin D deficiency to many autoimmune diseases. There are limited data on vitamin D in Alopecia Areata, an autoimmune disease which in our experience shows seasonality in most of its remitting-relapsing forms. Our results demonstrate the presence of insufficiency of 25-hydroxyvitamin D (25OH-D) in many patients with various clinical forms, correlated with the expecte...

Background 25-hydroxy vitamin D [25(OH) VitD] deficiency is a highly prevalent condition, present in approximately 30% to 50% of the general population. A growing body of data suggests that low 25(OH) VitD levels may adversely affect cardiovascular health. The present study aimed to measure the serum levels of 25(OH) Vit D in Congenital heart disease (CHD) children compared to healthy children....

Background. Vitamin D deficiency is widespread throughout the world. Several reports have incriminated vitamin D deficiency as the cause of rickets, osteomalacia, and other chronic diseases. Recent studies have suggested a possible link between deficiency of 25-hydroxyvitamin D and dyslipidemia. Aim. To investigate the association between 25-hydroxyvitamin D deficiency and dyslipidemia in India...