Debbie,
 There is a blood test for adrenal tumors in ferrets commonly called a
"Tennessee Panel".  Have your vet contact the following:
 
Please call prior to submitting samples for the first time
 
Shipping Address
UTCVM Clinical Endocrinology Laboratory Tests
Department of Comparative Medicine, Rm A105
2407 River Drive
Knoxville, TN 37996-4500
(865) 974-5638
 
The test takes at least a few weeks because they run them in batches.
 
It is my understanding that ferrets don't get Cushing's disease.  Dr
Williams?
 
Blessings,
cb
[Posted in FML issue 3326]