ARUP's Laboratory Test Directory

0070030: Cortisol, Serum or Plasma

Test Mnemonic: CORTISOL
Methodology: Chemiluminescent Immunoassay

Performed: Sun-Sat

Reported: Within 24 hours

Specimen Required:  
Collect: One 4 mL SST or PST. Also acceptable: green (sodium or lithium heparin).

Transport: 1 mL serum or plasma at 2-8°C. (Min: 0.6 mL)  Submit specimen in an ARUP Standard Transport Tube.

Pediatric Collection/Transport: 0.4 mL serum or plasma at 2-8°C.

Remarks: Allow specimen to clot completely at room temperature.  Separate serum or plasma from cells ASAP.

Stability: After separation from cells: Ambient: 1 week; Refrigerated: 1 week; Frozen: 3 months

Interpretive Data:
0800 hours: 6-23 µg/dL
2000 hours: 0-9 µg/dL
8 hours post 1 mg dexamethasone given at midnight: 0-5 µg/dL
30-60 minutes post 25 units Cosyntropin I.V.: > 20 µg/dL



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

CPT Code(s):
82533

 

 

 
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