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Test Code LAB61 Cortisol, Plasma

Performing Laboratory

Barnes-Jewish Hospital Laboratory

Methodology

Electrochemiluminescence Immunoassay (ECLIA)

Literature References:

1. Package insert: Cortisol II Roche Corporation 05/2021
 

Specimen Requirements

Specimen Type: Plasma

Container/Tube:  Mint-green top (lithium heparin)

Specimen Volume: Full tube

Collection Instructions: Morning (0800) and afternoon (1600) specimens are desirable.

Additional Information: Prednisone and prednisolone can interfere with this assay by causing a false-positive reaction.

Day(s) Test Set Up

Monday through Sunday
 

Turnaround Time:
STAT: 2 hours after receipt in laboratory 

Routine:4 hours after receipt in laboratory

Test Classification and CPT Coding

82533

Reference Values

MORNING
4.8 - 19.5 ug/dL
AFTERNOON
2.5 - 11.9 ug/dL
Note: This analyte undergoes marked diurnal variation. 

Specimen Transport Temperature

Ambient

Additional Information

For BJH Laboratory Use Only
Alternate Tube:

Red-top tube

Dark green tube (Li Hep)

Purple top (K2 & K3 EDTA)

Separator gel tube is acceptable

Analyte Stability:

See Analyte Stability Chart in Special Instructions.

Laboratory Processing Instructions:

Test performed in BJH Core lab.  Processed by automated line for delivery to the Cobas 8000.  Completed specimens are stored refrigerated for 5 days.        

Test performed in Ambulatory Cancer Building Lab.  Centrifuge sample and deliver to the Cobas.  Completed specimens are stored refrigerated for 5 days. 

Special Instructions

LOINC Code Information

Name LOINC code
Cortisol, Plasma 20433-9