ARUP's Laboratory Test Directory

Cortisol, Serum or Plasma : 0070030

Mnemonic: CORTISOL

Methodology: Chemiluminescent Immunoassay
Performed: Sun-Sat
Reported: Within 24 hours
Specimen Required: Collect:  One 4 mL serum separator tube or plasma separator tube. 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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