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Test Directory

Test Directory Dexamethasone

Dexamethasone

Test Summary

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.

Aliases

Specimen Collection

Special Instructions

N/A

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

Patient Preparation

N/A

Storage

N/A

Transport Temperature

Refrigerated (cold packs)

Specimen Stability

Room temperature: 72 hours
Refrigerated: 14 days
Frozen: 90 days

Limitations

N/A

Other Acceptable Specimens

N/A

Unacceptable Specimens

Gross hemolysis • Grossly lipemic • Serum separator tube (SST)

Order Code

DEXA

EPIC (Premier) Code

LAB3374

Includes

N/A

CPT Code

80299

Billing Code

670851

CPT Statement

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. The FDA has determined that such clearance or approval is not necessary. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.

Physician Attestation of Informed Consent

N/A

Testing Laboratory

Quest Diagnostics Nichols Institute
33608 Ortega Highway
San Juan Capistrano CA, 92675

Department

Reference Testing

Reference Range

Baseline	Less than 20 ng/dL
1 mg dexamethasone overnight	180-550 ng/dL (8:00-10:00 AM)

Setup Schedule / Expected Turnaround Time

Monday; Report available: 3 - 11 days