Laboratory Test Reference Guide

Laboratory Information

Test Name

Cortisol urine 24h

External Price (excl. GST)

27

Specimen Collection

Specimen Collection and Transport Protocols

24 hr urine collection. No preservative

Test Information

Department

Biochemistry

Test Availability

Fortnightly

Laboratory Turnaround Time

14 days

Method

Cobas e411

Unit of measurement

nmol/24hr

Reference interval

< 280  nmol/24 hr.

The current assay was implemented on 30 October 2023. Compared with the previous assay ( RI <380 nmol/24 hr) results are approximately 55% lower.

Reference interval Attachments

Uncertainty of measurement

10%

Diagnostic Use Or Instructions

Urinary cortisol is restricted to patients being investigated or monitored for Cushing's Syndrome.

Testing will not be performed if supportive clinical information is not provided

 

Additional Information

For interfering substances with % cross reactivity (this applies to the urinary cortisol assay only) see the attachment in reference interval attachments

 

Minimum Volume

3 ml of 24 hour urine. State total volume.

Electronic Information

Registration Code

CORTU

HL7 mapping code

$CORTU

LOINC Code

30173-9