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- W2473340307 abstract "Abstract Variations in vitamin D quantification methods are large and influences of vitamin D analogues and blood collection methods have not been systematically examined. We evaluated the effects of vitamin D analogues 25OHD 2 and 3-epi 25OHD 3 and blood collection methods on vitamin D measurement, using five immunoassay systems and liquid chromatography-tandem mass spectrometry (LC-MS/MS). Serum samples (332) were selected from routine vitamin D assay requests, including samples with or without 25OHD 2 or 3-epi 25OHD 3 and analysed using various immunoassay systems. In samples with no 25OHD 2 or 3-epi 25OHD 3 , all immunoassays correlated well with LC-MS/MS. However, the Siemens system produced a large positive mean bias of 12.5 ng/mL and a poor Kappa value when using tubes with clot activator and gel separator. When 25OHD 2 or 3-epi 25OHD 3 was present, correlations and clinical agreement decreased for all immunoassays. Serum 25OHD in VACUETTE tubes with gel and clot activator, as measured by the Siemens system, produced significantly higher values than did samples collected in VACUETTE tubes with no additives. Bias decreased and clinical agreement improved significantly when using tubes with no additives. In conclusion, most automated immunoassays showed acceptable correlation and agreement with LC-MS/MS; however, 25OHD analogues and blood collection tubes dramatically affected accuracy." @default.
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- W2473340307 date "2015-09-30" @default.
- W2473340307 modified "2023-10-11" @default.
- W2473340307 title "25OHD analogues and vacuum blood collection tubes dramatically affect the accuracy of automated immunoassays" @default.
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- W2473340307 doi "https://doi.org/10.1038/srep14636" @default.
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