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Labcorp Oklahoma, Inc.
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Cortisol, Dexamethasone Suppression Test

Order Name CORTISL DX
Test Number: 4500725
Revision Date 09/07/2023
Test Name Methodology LOINC Code
Cortisol, Dexamethasone Suppression Test
Chemiluminescence Assay 47844-6 
SPECIMEN REQUIREMENTS
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 1 mL (0.5) Serum Clot Activator SST Refrigerated
Alternate 1 1 mL (0.5) Plasma Lithium Heparin PST (Light Green Top) Refrigerated
Instructions Specimen should be drawn at 0700 next morning after 1.0 mg of dexamethasone administered orally at bedtime.
Stability: Ambient 8 hours, Refrigerated 14 days, Frozen 30 days
GENERAL INFORMATION
Testing Schedule Mon - Fri 
Expected TAT 1-3 days  
Clinical Use Dexamethasone Suppression test is used to document hypersecretion of the adrenocortical hormones and evaluation of depression. 
CPT Code(s) 82533
Lab Section Chemistry