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Mayo Clinic Laboratories

Test Code CORSF Cortisol, Free by Equilibrium Dialysis/LC-MS/MS

Clinical Indications

Screen, diagnose, and monitor diseases associated with excess or deficient cortisol production.

Additional Test Codes

Epic Order Name: SERUM FREE CORTISOL (aka CORSF)
Sunquest Order Code: CORSF
Epic Px Code: LAB2162

Specimen Collection Type

Preferred: Gold
Acceptable: Red or lavender

Minimum Collection Volume

0.6 mL

Reference Range

Age

Time of Collection

Reference Range

0 - 17 years

 

Not established

18 years of age and older

8-10 a.m. collection

0.21 - 1.04 µg/dL

18 years of age and older

4-6 p.m. collection

0.10 - 0.63 µg/dL

Critical Value

n/a

Interpretation

N/A

Rejection Criteria

Grossly hemolyzed, icteric, lipemic or heparinized specimens

Specimen Availability for Add-on Testing

2 Days

Specimen Stability

Frozen (preferred): 6 months
Ambient: Unacceptable
Refrigerated: 1 week

Day(s) Performed

Sun, Tue, Thu, Fri

Performing Lab - Department

TUKHS-BH-Mail Outs

CPT Code

82530

LOINC Code

2145-1

Test Alias

Hydrocortisone, Free

Additional Information / Notes

Recommended collection times are 8-10 a.m. or 4-6 p.m.

To convert to nmol/L, multiply µg/dL by 27.6