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Cortisol, Serum or Plasma
MessageTo convert to nmol/L, multiply µg/dL by 27.6.
Test Code
2509
Alias/See Also
Dexamethasone Suppression
Preferred Specimen
Serum separator tube or plasma separator tube. Also acceptable: Green (sodium or lithium heparin).
Minimum Volume
Refrigerated.
Instructions
Allow specimen to clot completely at room temperature. Separate serum or plasma from cells ASAP or within 2 hours of collection. Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.6 mL)
Transport Temperature
Refrigerated.
Specimen Stability
After separation from cells: Ambient: 1 week; Refrigerated: 1 week; Frozen: 3 months
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Saliva (refer to Cortisol, Saliva, ARUP test code 0080117).
Methodology
Quantitative Chemiluminescent Immunoassay
Setup Schedule
Sun-Sat
Report Available
Within 24 hours
Clinical Significance
0800 hours: 6-23 µg/dL2000 hours: 0-9 µg/dL8 hours post 1 mg dexamethasone given at midnight: 0-5 µg/dL30-60 minutes post 25 units Cosyntropin I.V.: > 20 µg/dL
