5 - 20 days
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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.
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.