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Test Code FDXM Dexamethasone

Reporting Name


Performing Laboratory

Esoterix Endocrinology

Specimen Type


Specimen Required

Draw blood in a plain, red-top tube(s). Spin down and send 3 mL of serum frozen in a plastic vial.


Note: Serum gel tube is acceptable, but must pour off into a plastic vial.

Specimen Minimum Volume

Pediatric minimum: 1 mL
Note: Does not allow for repeat analysis.

Specimen Stability Information

Specimen Type Temperature Time
Serum Frozen (preferred) 365 days
  Refrigerated  14 days
  Ambient  6 days

Reference Values

Units = ng/dL


Adults baseline:                        <30

8:00 AM following 1 mg dexamethasone

previous evening:                      140 - 295

8:00 AM following 8 mg dexamethasone

(4 x 2 mg doses) previous day:  1600 - 2850

Day(s) and Time(s) Performed


CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
FDXM Dexamethasone 14062-4


Result ID Test Result Name Result LOINC Value
Z1745 Dexamethasone 14062-4

Method Name

High-pressure liquid chromatography/tandem mass spectrometry (HPLC/MS-MS)

Barnes-Jewish Hospital Additional Information:

For BJH Laboratory Use Only

BJH Chemistry will forward to the performing laboratory.