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Background: Urinary oxalate is commonly measured with an enzymatic assay that is specific but requires a manual clean-up step to reduce ascorbic acid interference. We developed a urinary oxalate assay that uses liquid chromatography-tandem mass spectrometry (LC-MS/MS) with anion exchange chromatography and simple sample preparation.

Methods: We added calibrator or urine sample (10 microL) to 10 microL of (13)C2 oxalate and 400 microL of water and performed separation on a Waters OASIS WAX column, flow rate 0.

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