I believe saliva tests can be very helpful and effective. As far as the Isocort, I've heard mixed opinions. Anything in pill or tablet form is only about 10 - 20 % absorbed by the body so results tend to be average.
Nothing stimulates the adrenal glands as much as a very effective, water soluble vitamin/mineral, and antioxidant formula FIRST and then any additional adrenal supplements can be used. Without that firm foundation any additional supplements become only slightly effective as the body is not prepared to receive or absorb the supplements properly.