× Test Guide Collection Guides Guidelines News Contact Useful Links

Laboratory Test Reference Guide

Laboratory Information

Test Name

Cortisol urine 24h

External Price (excl. GST)

Price

$23.32

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

< 380  nmol/24 hr.

Uncertainty Of Measurement

15%

Diagnostic Use Or Instructions

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

Testing for "non medically indicated reasons" can be performed if the patient is willing to pay $25.

To arrange payment ph: 07 8398606 ext 96142.

Dr Stephen Du Toit, Chemical Pathologist (07 8398606 ext94921)

Additional Information

Interfering substances with % cross reactivity (this applies to the urinary cortisol assay only) 

Corticosterone                            5.8%

Cortisol-21-sulfate                      0.04%

Cortisone                                    0.3%

11-Deoxycorticosterone             0.69%

11-Deoxycortisol                        4.1%

21-Deoxycortisol                        45.4%

6-Beta-OH Cortisol                    158% 

Dexamethasone                         0.08%

17 OH progesterone                  1.5%

Prednisone                                 0.28%

Prednisolone                              171%

6 Alpha methylprednisolone       389%

 

Minimum Volume

3 ml of 24 hour urine. State total volume.

Electronic Information

Registration Code

CORTU

HL7Mapping Code

$CORTU

LOINC Code

30173-9