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Overnight urinary free cortisol determination: A screening test for the diagnosis of Cushing's syndrome

The collection of urine over 24 h to measure free cortisol (UFC) is used to diagnose Cushing's syndrome. However, a complete collection of urine is not easy to achieve and the sampling is frequently inaccurate, so a 24 h collection for the determination of UFC excretion is used as a confirmatory rather than a screening test for Cushing's syndrome. Our objective was to evaluate a more convenient urine collection for screening patients suspected of Cushing's syndrome.