@bgaro - They really can’t do any testing regarding your adrenal gland until you get down to 5 mg. The Prednisone makes your adrenal gland go to sleep. It gets a rest and then you have to just hope it wakes up. I did have to ask for the ACTH test at Mayo Clinic and then they referred me to their Endocrinologist and she ordered the test. I was on the Prednisone for 1 1/2 years and was very happy when the test came back that my adrenal gland was ready to work.