Test Overview
Test Methodology

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

Reference Range *

Adults: <30 ng/dL the morning after 1mg dexamethasone dose the previous evening
140 - 295 ng/dL the morning aftr (4 x 2 mg doses) the previous day

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details
Days Set Up
Monday
Analytic Time

5 - 20 days

Soft Order Code
FDXM
Laboratory
Sendout
Reference Laboratory
Mayo FDXM (Esoterix Endocrinology 500140)
Section
Special Testing
Specimen Requirements
Collection Instructions

Draw blood in a plain, red-top tube(s). Spin down and send 3 mL of serum frozen in a plastic vial. SST is acceptable, but must be aliquoted into a screw capped plastic tube.

Red Top Tube
Normal Volume
3 mL serum
Minimum Volume
1 mL serum (min volume does not allow for repeat analysis)
Storage Temperature
Frozen
Additional Information

Test sent to Mayo Medical Laboratories; performed by Esoterix Endocrinology).

Billing
CPT Code
80375
Fee Code
AA389
LOINC
14062-4
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