[en] BACKGROUND: Chronic kidney disease (CKD) is diagnosed and explored through the determination of the glomerular filtration rate (GFR). Our goal was to develop a simple LC-MS method for the determination in serum of 2 popular GFR markers, contrast agents iohexol and iothalamate, for routine use and comparison studies between the two markers. A similar contrast agent, ioversol, was used as an internal standard and the method underwent a rigorous validation protocol based on beta-expectation tolerance intervals. METHODS: We adapted the HPLC-UV method from Cavalier et al. to our LC-MS system. Data treatment for the validation was performed using Multiquant 3.0 (Sciex, Framingham, MA, USA) and e.noval 3.0 software (Arlenda, Liege, Belgium). RESULTS: According to the validation results our method will give accurate and reliable results for concentrations ranging from 6.8 to 250mug/ml for iohexol and 6.15mug/ml to 250mug/ml for iothalamate. In our practice these intervals are sufficient to determine both compounds in most patient samples. Samples with higher detected concentrations can always be diluted into range. CONCLUSION: With its internal standard and extensive validation, our method is now ready for routine and clinical research use.
Disciplines :
Laboratory medicine & medical technology
Author, co-author :
Nyssen, Laurent ; Université de Liège > Département de pharmacie > Chimie médicale
DELANAYE, Pierre ; Centre Hospitalier Universitaire de Liège - CHU > Service de néphrologie
Le Goff, Caroline ; Université de Liège > Département de pharmacie > Chimie médicale
PEETERS, Stéphanie ; Centre Hospitalier Universitaire de Liège - CHU > Service de chimie clinique
Cavalier, Etienne ; Université de Liège > Département de pharmacie > Chimie médicale
Language :
English
Title :
A simple LC-MS method for the determination of iohexol and iothalamate in serum, using ioversol as an internal standard.
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