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• W2019521917 abstract "Background:Now emerging as an important risk factor for type 1 diabetes, vitamin D deficiency is also associated with obesity, metabolic syndrome, and type 2 diabetes and has been identified as a potential cardiometabolic risk factor. A simple, accurate screening test for 25-hydroxy vitamin D [25(OH)D] deficiency is needed. We developed a liquid chromatography/tandem mass spectrometry assay for 25-hydroxy vitamin D2 [25(OH)D2] and 25-hydroxy vitamin D3 [25(OH)D3] in dried blood spots.Method:Blood spots were collected by finger stick simultaneously with serum samples obtained by venipuncture from healthy volunteers. Disks punched from the dried blood spots were sonicated with an internal standard solution of deuterated 25(OH)D3 (26,26,26,27,27,27-d6). Methanol was added to precipitate proteins prior to extraction with hexane. The extracted samples were dried and reconstituted in 50:50 methanol:H2O before injection into a Varian 320-MS TQ mass spectrometer.Results:Blood spot assay precision was good over the reportable range: interassay coefficients of variation were 13, 13, and 11% at concentrations of 14, 26, and 81 ng/ml, respectively, for 25-hydroxy vitamin D3 and 12% at 23 ng/ml for 25(OH)D2. The 25(OH)D3 assay was linear from 3.5 to 75 ng/ml (R > 0.99). Blood spot and serum values showed excellent correlation for 25(OH)D2 (R = 0.90, n = 54) and 25(OH)D3 (R = 0.91, n = 83).Conclusions:This blood spot assay for 25(OH)D2 and 25(OH)D3 provides a convenient and cost-effective alternative to serum assays and can be automated. This may be valuable in large-scale screening for risk of type 1 diabetes, for cardiometabolic risk screening, and for monitoring vitamin D supplementation." @default.
• W2019521917 created "2016-06-24" @default.
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• W2019521917 date "2009-01-01" @default.
• W2019521917 modified "2023-09-26" @default.
• W2019521917 title "A Liquid Chromatography/Tandem Mass Spectrometry Method for Determination of 25-Hydroxy Vitamin D₂and 25-Hydroxy Vitamin D₃in Dried Blood Spots: A Potential Adjunct to Diabetes and Cardiometabolic Risk Screening" @default.
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• W2019521917 doi "https://doi.org/10.1177/193229680900300118" @default.
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