5 - 20 days
Test Updated:
Looking to order a test?
We’ve provided helpful links to make ordering easy.
Find a RequisitionAll specimens should be accompanied by a requisition.
Submitting SpecimensLearn about how to properly label and where to ship specimens.
Order Kits and SuppliesMLabs provides all the supplies necessary for the collection of specimens.
Test FAQVisit our provider FAQ and learn about common questions to ordering tests.
Test Overview
High-pressure liquid chromatography/tandem mass spectrometry (HPLC/MS-MS)
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.
Specimen Requirements
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.