A number of protocols are available.
The most common protocol is to administer 1.0 mg of Dexamethasone at 11 PM and to draw the specimen the next morning at 8 AM.
It is not recommeded to do this test on patients treated with Prednisolone.
Gold serum separator (SST) tube
PST - spin
Dk green/lavender - spin and separate
Refrigerated (preferred) - 14 days
Frozen - 30 days
< 5.0 µg/dL