Henny van Daal

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Citrulline is a nonessential free amino acid, detectable in various biological fluids such as plasma, urine and cerebrospinal fluid. The plasma citrulline concentration is increasingly considered to(More)
The plasma 25-OH vitamin D concentration is a reliable biomarker for vitamin D status but assay's variability makes adequate monitoring of vitamin D status difficult. We employed isotope-dilution(More)
BACKGROUND An LC-MS/MS method was developed for simultaneous quantification of 25-hydroxyvitamin D3 (25(OH)D3), 3-epi-25(OH)D3, and 25(OH)D2 in human serum. METHODS Sample preparation consisted of(More)
BACKGROUND Structural hemoglobin variants can affect the accuracy of hemoglobin A1c (HbA1c) testing and represent the most common pitfall in the determination of HbA1c. We here describe the(More)
BACKGROUND Presence of the 3-epi-25-hydroxyvitamin D3 [3-epi-25(OH)D3] metabolite affects accurate determination of 25(OH)D3 by most routine liquid chromatography-tandem mass spectrometry (LC-MS/MS)(More)
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