Cortisol, Free
Label Mnemonic: CORTF
Epic Lab Code: LAB7775
Downtime Form: A-1a Miscellaneous Request
Commercial Mail-out Laboratory
5231 RCP
356-8593
Specimen(s):
Serum
Specimen Instructions:
Recommended collection times are 8-10 a.m. or 4-6 p.m.
Collection Medium:
Red top tube 5 mL (Clot Activator)
Minimum:
Preferred Minimum: 1 mL serum collected in a red-top tube.
Absolute Minimum: 0.6 mL serum collected in a red-top tube.
Indicate time of draw on test request form and specimen tube.
Rejection Criteria:
Grossly hemolyzed, icteric, lipemic or heparinized specimens.
Turn Around Time:
2-5 days upon receipt at reference laboratory
Reference Range:
0 - 17 years Not established 18 years of age and older 8-10 a.m. collection 0.11-1.04 μg/dL 18 years of age and older 4- 6 p.m. collection 0.10-0.63 μg/dL
Comments:
To convert to nmol/L, multiply μg/dL by 27.6.

This test is recommended to screen, diagnose, and monitor diseases associated with excess or deficient cortisol production.
Methodology:
Equilibrium Dialysis/Quantitative
Performance Liquid Chromatography-Tandem Mass Spectrometry
CPT Code:
82530