A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # |
Dexamethasone
Test CodeDEXA
Alias/See Also
29391
CPT Codes
80299
Preferred Specimen
0.85 mL serum collected in a red-top tube (no gel)
Minimum Volume
0.25 mL
Instructions
Draw specimen between 8:00 a.m. and 10:00 a.m.
Please note: SST tubes are unacceptable, and will cause interference with the results
Please note: SST tubes are unacceptable, and will cause interference with the results
Transport Temperature
Refrigerated (cold packs)
Specimen Stability
Room temperature: 72 hours
Refrigerated: 14 days
Frozen: 90 days
Refrigerated: 14 days
Frozen: 90 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis • Grossly lipemic • Serum separator tube (SST)
Methodology
Chromatography/Mass Spectrometry
FDA Status
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by the U.S. Food and Drug Administration. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.
Setup Schedule
Monday Morning Report available: 2 Days after receipt at the performing laboratory. Add three (3) days for transport.
Reference Range
Baseline | Less than 20 ng/dL |
1 mg dexamethasone overnight | 180-550 ng/dL (8:00-10:00 AM) |
Clinical Significance
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.
Performing Laboratory
Quest Diagnostics Nichols Inst San Juan Capistrano
33608 Ortega Highway
San Juan Capistrano, CA 92690-6130
Last Updated: May 5, 2023