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Test Code CORTR Cortisol Random

Additional Codes

  • Expanse Test Name: Cortisol Random
  • Medinet Ref Code: CORTR
  • OV Code: CHEM*CORTR

Performing Laboratory

St. Lukes Hospital Laboratory

Methodology

Competitive Chemiluminescent Immunoassay

Specimen Requirements

Draw blood in a serum gel tube(s) preferred. Plasma from a lithium heparin tube is acceptable.

Spin down and send 1 mL of serum (or plasma) refrigerated. If there is a delay in transport of 48 hours, freeze specimen in plastic vial.
Note:  Specimen can only be thawed once.

 

Unspun specimens must be transported at ambient temperature and arrive to the laboratory within one hour of draw.

Reference Values

Reference ranges vary according to the time of day the specimen is drawn.
0800:  5-25 mcg/dL

1600:  approximately half of the morning result

Interfering Substances:

Circulating cortisol results may be falsely elevated in specimens drawn from patients being treated with prednisolone or prednisone (converted to prednisolone in vivo). Caution must therefore be exercised with cortisol determinations for patients undergoing therapy with these and structurally-related synthetic corticosteroids.

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding

CPT: 82533

LOINC: 2143-6

Specimen Stability

Specimen can be refrigerated at 2° C to 8° C for 2 days, or frozen at -20° C.