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Abstract
In order to assess the significance of the intestinal absorption of oxalate from food for the hyperoxaluria of the individual patient, an oxalate absorption test has been developed using doubly 13C-labelled oxalate and a gas chromatographic selected ion monitoring mass spectrometric assay. This test has been applied to volunteers and patients with urinary stones. The percentage of dose absorbed (range 1–48%) could be determined with a coefficient of variation of 15.2%. The assay to measure doubly 13C-labelled oxalate in the presence of unlabelled oxalate in urine, using the homologue malonic acid as internal standard, is described.
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Schedule a callMore From: Journal of Chromatography B: Biomedical Sciences and Applications
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