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HelpEpic Code LAB1231936 Dexamethasone, Serum
Test Name Alias
LAB1230895 | Quest: 29391 | Dexameth
Interface Order Alias
1231936
Clinical Information
Dexamethasone - Measurement of Dexamethasone is useful in assuring compliance with Dexamethasone treatment and documenting adequate dosing during such procedures as the Dexamethasone Suppression Test used in the differential diagnosis of Cushing's syndrome.
Specimen Requirements
Instructions
Specimen should be collected between 8 am – 10 am.
Specimen Collection Criteria
Collect: One plain Red-top tube. Gold top SST unacceptable
Physician Office/Draw Specimen Preparation
Let specimen clot 30-60 minutes then centrifuge to separate serum from cells.. Transfer serum to a plastic transport tube and refrigerate (2-8°C or 36-46°F) prior to transport.
In-Lab Processing
Let specimen clot 30-60 minutes then centrifuge to separate serum from cells. Transfer serum to a plastic transport tube and refrigerate (2-8°C or 36-46°F).
Specimen Transport Temperature
Transport: 0.85 mL serum, refrigerated (2-8°C or 36-46°F). (Minimum: 0.25 mL)
Rejection Criteria
- Gross hemolysis.
- Grossly lipemic.
- Serum separator tube (SST)
- Specimen not collected and processed as indicated.
Specimen Stability
Specimen Stability for Testing:
Room temperature (20-26°C or 68-78°F): 72 hours
Refrigerated (2-8°C or 36-46°F): 14 days
Frozen (-20°C/-4°F or below): 3 months
Specimen Storage in Department Prior to Disposal:
Specimen retention time is determined by the policy of the reference laboratory. Contact the Send Outs Laboratory with any questions.
Test Frequency
Performed: Monday.
Results available in 2-10 days.
Reference Range
|
Baseline |
Less than 20 ng/dL |
|
1 mg dexamethasone overnight |
180-550 ng/dL (8:00-10:00 AM) |
Performing Department
Send Outs
Performing Department Laboratory Location
Sent to Quest Diagnostics- Wood Dale, IL
Methodology
Chromatography/Mass Spectrometry
CPT
80299
LOINC
14062-4
Reviewed Date
11/2/2025
Orderable Regions
Send Outs