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Dexamethasone Suppression Test

Source
Mnemonic

Refer to Cortisol page.

CLS staff: If only "Dexamethasone" is ordered, refer to Dexamethasone Assay.

Specimen Requirements To monitor this drug, serum pre and post cortisol is performed. Refer to Cortisol for collection requirements.
Specimen Handling

For Oral Dexamethasone Suppression test:

Day 1:
Collect a base level cortisol sometime during the day.  Note time of collection on the tube.
At 23:00 (11:00 p.m.) the same evening, the patient takes 1 mg Dexamethasone orally, which is provided by the physician.

Day 2:
At 08:00 to 10:00 the next day collect specimen for a.m. cortisol.
At 8 hours later on the same day, collect specimen for p.m. cortisol.

Note time of collection on each tube.

Additional Information

Testing Location Chemistry-DSC
Testing Frequency
Alternate Name(s)
Reference Interval