Mechanism of error caused by isotope-labeled internal standard: accurate method for simultaneous measurement of vitamin D and pre-vitamin D by liquid chromatography/tandem mass spectrometry.


RATIONALE Bias of up to 25% has been observed for vitamin D3 and D2 samples exposed to heating during sample preparation, even when isotope-labeled internal standards are used. The goals of this study were to identify the mechanism of the positive bias observed in measuring vitamin D3 and D2 by liquid chromatography/tandem mass spectrometry (LC/MS/MS) and… (More)
DOI: 10.1002/rcm.6987


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