Cortisol, Free, LC/MS/MS, 24-Hour Urine

Test Code

CORTFU

Quest Code

11280X

Alias/See Also

QNI Test Code 11280X

CPT Codes
82530

Includes

CPT code 81050 may be added at an additional charge for volume measurement

Preferred Specimen

2 mL urine from a 24-hour collection (no preservatives)

Minimum Volume

0.5 mL

Other Acceptable Specimens

25 mL 6N HCl • 10 mL concentrated glacial acetic acid • 10 g boric acid

Instructions

Record 24-hour urine volume on test requisition and urine vial. Reference ranges do not apply to random urine samples.

Transport Temperature

Refrigerated (cold packs)

Specimen Stability

Room temperature: 14 days
Refrigerated: 21 days
Frozen: 90 days

Methodology
Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)

Setup Schedule

Night Sets up 6 days a week.

Reference Range

Cortisol, Free, 24-Hr Urine

Adult	4.0-50.0
Pediatric
1-4 Years	0.9-8.2 mcg/24 hrs
5-9 Years	1.0-30.0 mcg/24 hrs
10-13 Years	1.0-45.0 mcg/24 hrs
14-17 Years	3.0-55.0 mcg/24 hrs

Creatinine, 24-Hour Urine

<3 Years	Not established
3-8 Years	0.10-0.80 g/24 hours
9-12 Years	0.20-1.40 g/24 hours
13-17 Years	0.40-1.90 g/24 hours
>17 Years	0.50-2.15 g/24 hours

Clinical Significance

Urinary Free Cortisol is useful in the detection of patients with Cushing's syndrome for whom Free Cortisol concentrations are elevated.

Performing Laboratory
Quest Diagnostics Nichols Institute
33608 Ortega Highway
San Juan Capistrano, CA 92675-2042

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.