Twenty-Four-Hour Urinary Free Cortisol
Endocrine Laboratory Assessment and Functional Testing
Twenty-Four-Hour Urinary Free Cortisol
Twenty-four-hour urinary free cortisol estimates integrated urinary excretion of unbound cortisol over the collection period.
Separate biological and analytical effects
Hormone results depend on secretion rhythms, binding, clearance, sample handling and the measurement method. Reference intervals and decision thresholds serve different purposes. Assay-specific interpretation is especially important near low concentrations and when results conflict with the clinical picture.
Interpreting the mechanism
Incomplete collection and renal impairment can affect results, and mild or intermittent cortisol excess may require additional assessment.
Define the testing question
Dynamic tests examine a regulated response under specified conditions. Their protocols, contraindications and thresholds require clinical oversight. A glossary explanation supports understanding and does not provide a self-testing or medication-adjustment protocol.
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