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
AA389
LOINC
14062-4
NY State Approved
No