Update Type: Replacement Test
Test Updated: 04/20/2022
Test Overview
Test Methodology

Liquid chromatography/tandem mass spectrometry (LC/MS-MS)

Reference Range *

Adults: Baseline <30 ng/dL
8:00 am following 1mg Dexamethasone the previous evening: >100 ng/dL
8:00 am following 8mg Dexamethasone (4x2mg doses) previous day: >800 ng/dL

Test Details
Days Set Up
Tuesday, Thursday
Analytic Time

3 - 6 days

Soft Order Code
DEXA
Laboratory
Sendout
Reference Laboratory
Mayo DEXA
Section
Special Testing
Specimen Requirements
Collection Instructions

Draw blood in a plain, red-top tube(s). Spin down within an hour of collection, and send 2 mL of serum frozen in a plastic vial. SST is acceptable, but must be aliquoted into a screw capped plastic tube.

Normal Volume
2 mL serum
Minimum Volume
0.6 mL serum
Storage Temperature
Frozen
Additional Information

Test sent to Mayo Clinic Laboratories

Billing
CPT Code
80299
Fee Code
AB046
LOINC
14062-4
NY State Approved
No