Imperial Collage Healthcare

Filter by A-Z

Cortisol (urine)


Test Background
Cortisol is secreted in a diurnal pattern with peak values occurring in the early morning. Random serum cortisol may be difficult to interpret. The diurnal rhythm may be disrupted or lost in Cushing’s syndrome. Free cortisol measured in a 24 hour urine collection may be a more useful diagnostic tool in some patients.


Clinical Indications
Most specific diagnostic indicator of Cushing’s syndrome Differential diagnosis of phaeochromocytoma and Conn’s syndrome


Reference Range
50-270 nmol/L


Sample Required
24 hour urine collection


Sample Collection
Please include time and volume for the 24 hour collection.


Sample Volume
1 mL


Transport/Storage

Stable at 2-8oC for 24 hours. Please freeze pending dispatch for analysis.

Can be sent by first class post.


Turnaround Time
2 weeks


Notes
Acidified samples are unsuitable for this assay.


Select a test from the list to view more details.