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Background:  The best index of adrenal dysfunction is urinary free cortisol (UFC) measurements performed using a 24-h urine collection. This measurement is also useful in the investigation of Cushing's syndrome. In this paper, we report a simple and selective method for the analysis of UFC by liquid chromatography-tandem mass spectrometry (LC-MS/MS) suitable for use in a high-volume clinical laboratory routine. The results were compared to those obtained using a commercial immunoassay method used in our laboratory.

A simple liquid chromatography-tandem mass spectrometry method for urinary free cortisol analysis: suitable for routine purpose