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- W2022127911 abstract "Abstract Background: Presence of the 3-epi-25-hydroxyvitamin D 3 [3-epi-25(OH)D 3 ] metabolite affects accurate determination of 25(OH)D 3 by most routine liquid chromatography-tandem mass spectrometry (LC-MS/MS) methods and to an unknown extent in present immuno- and protein binding assays. We studied 3-epi-25(OH)D 3 cross-reactivity in a competitive protein binding (CPB) assay (Roche Elecsys). Methods: Neonatal samples, containing up to 58% of 3-epi-25(OH)D 3 were used for measurement by the CPB assay and by an LC-MS/MS method separating 25(OH)D 3 and 3-epi-25(OH)D 3 . Analytical recovery was also studied by addition of exogenous 3-epi-25(OH)D 3 . Results: The CPB assay showed approximately 51% cross-reactivity to 3-epi-25(OH)D 3 at exogenous addition. In contrast, there was minimal 3-epi-25(OH)D 3 recognition by the CPB assay when present as the natural endogenous metabolite. Conclusions: The automated CPB assay displays minimal 3-epi-25(OH)D 3 cross-reactivity in samples containing significant concentrations of endogenous 3-epi-25(OH)D 3 . Exogenous 3-epi-25(OH)D 3 added to human serum or plasma seems to behave different from endogenous presence, and caution is warranted when using samples spiked with vitamin D metabolites for testing analytical specificity or external quality assurance in immuno- or protein binding assays." @default.
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- W2022127911 date "2013-10-09" @default.
- W2022127911 modified "2023-10-01" @default.
- W2022127911 title "Evaluation of 3-epi-25-hydroxyvitamin D<sub>3</sub> cross-reactivity in the Roche Elecsys Vitamin D Total protein binding assay" @default.
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- W2022127911 doi "https://doi.org/10.1515/cclm-2013-0702" @default.
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