Results 31 to 40 of about 71,944,619 (247)
Frontiers in Nutrition, 2021 Background: The association between circulating vitamin D levels and risk of vitiligo was inconsistent among observational studies, and whether these observed associations were causal remained unclear.
Jie Song +8 more
doaj +1 more source
Interlaboratory comparison of 25-hydroxyvitamin D assays: Vitamin D Standardization Program (VDSP) Intercomparison Study 2 - Part 2 ligand binding assays - impact of 25-hydroxyvitamin D(2) and 24R,25-dihydroxyvitamin D(3) on assay performance. [PDF]
, 2021 peer reviewedAn interlaboratory comparison study was conducted by the Vitamin D Standardization Program (VDSP) to assess the performance of ligand binding assays (Part 2) for the determination of serum total 25-hydroxyvitamin D [25(OH)D].
Simpson, Christine +71 more
core +1 more source
BMC Endocrine Disorders, 2023 Objective The objective was to analyze the relationship between serum 25-hydroxy-vitamin D (25(OH)D) level and albuminuiria in middle-aged and older patients with type 2 diabetes of Gansu Province.
Luyan Zhang +4 more
doaj +1 more source
Changes in plasma concentrations of 25-hydroxyvitamin D and 1,25-dihydroxyvitamin D during pregnancy: A Brazilian cohort [PDF]
, 2017 Purpose. To characterize the physiological changes in 25-hydroxyvitamin D [25(OH)D] and 1,25-dihydroxivitamin D [1,25(OH)2D] throughout pregnancy. Methods.
Franco-Sena, Ana Beatriz +32 more
core +1 more source
PLoS ONE, 2014 Background & aimsTo explore vitamin D status and its dynamic changes during pregnancy in women living in Northeast China. The association between 25-hydroxyvitamin D and serum calcium, phosphate and parathyroid hormone was studied.
Yuhang Zhao +6 more
doaj +1 more source
Performance evaluation of four 25-hydroxyvitamin D assays to measure 25-hydroxyvitamin D2
Clinical Biochemistry, 2015 The ability of current immunoassays to accurately measure equimolar amounts of 25(OH)D2 and 25(OH)D3 has been recently questioned. This study determined serum 25(OH)D2, 25(OH)D3 and total serum 25(OH)D concentrations in healthy vitamin D2-supplemented subjects by isotope dilution liquid chromatography mass spectrometry (ID-LC-MS/MS); and, evaluated the
Freeman, James +4 more
openaire +2 more sources
JCRPE, 2019 Reports suggesting that vitamin D may have extraskeletal roles have renewed interest in vitamin D research and stimulated publication of an increasing number of new studies each year. These studies typically assess vitamin D status by measuring the blood
Gary M. Kiebzak +4 more
doaj +1 more source
Reduction of circulating 25‐hydroxyvitamin D by antipyrine. [PDF]
British Journal of Clinical Pharmacology, 1979 1 Twenty‐four Asian vegetarians had significantly lower 25‐ hydroxyvitamin D (25‐OHD) levels and longer antipyrine half‐lives than twenty white non‐vegetarians (P less than 0.001). 2 Treatment with oral antipyrine over 4 or 5 weeks in seven vegetarian Asians and five racially different non‐vegetarians increased drug oxidation significantly in both ...
P F, Wilmana +9 more
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25-Hydroxyvitamin D Assays: The Quest For Accuracy [PDF]
Clinical Chemistry, 2009 The recently reported difficulties experienced by Quest Laboratories (1) have once again highlighted concerns about the reliability of 25-hydroxyvitamin D (25-OH-D)1 results, particularly those generated by liquid chromatography–tandem mass spectrometry (LC-MS/MS), the method used by Quest.
openaire +2 more sources
BMC Veterinary Research, 2020 Background Vitamin D deficiency and related metabolic bone diseases in pet rabbits have been intermittently debated. In human research, the parathyroid hormone concentration in relation to the 25-hydroxyvitamin D concentration is used to determine ...
J. Mäkitaipale +3 more
doaj +1 more source