Specimen Requirements
Title
Cortisol, Free, Urine
Specimen Requirement
24-hour urine collection required. Refrigerate during collection. Mix well and send 2.0 mL minimum aliquot refrigerated in a screw-capped plastic urine container.
Record total volume on request form and sample label.
Methodology
Stability
Refrigerated 7 days; Frozen 14 days
Reference Range
By Report*
Turnaround
1-4 days
Clinical Use
Assess adrenal function; particularly useful in the diagnosis of Cushing syndrome. Recent data suggest that urinary free cortisol concentrations can be significantly altered in patients taking inhaled corticosteroids
Test Code
UFCPW