CT, CAT, Computerized Tomography Scan: The focusing of extremely narrow X-rays on a specific level of plane of the body. There may or may not, be an injection of dye to help get a better image. You must lie as absolutely still while you are on the table while the CT scanning unit revolves around you. It is picked up by an electronic instrument called a Scintillator rather than being exposed on X-ray film. The Scintillator reads the density that tissue X-rays pass through. A computer prints out the densities as an illustration of the cross-section. There is no pain involved with this test.
A few natural products vie for the Canine Cushing’s market. You mentioned Supraglan and Cushex, neither of which am I qualified to talk about although I’m sure they are fine products. My recommendation is one of our Primalix naturopathic-veterinary Herbal Extract “Functional Food Drops” formulated specifically to ameliorate and eliminate symptoms of Cushing’s in all dog breeds. It’s called Primalix CortiQuel and everything I have to say about this safe and effective herbal remedy can be found at Cushing’s in Dogs.
Testing this axis is not as easy as it sounds. The mammalian body is a dynamic system with thousands of chemical reactions and interactions occurring simultaneously. Also, levels of cortisol are in a continual state of flux, depending on the time of day, the season, medications, diet, and stress levels. Underlying diseases like Urinary Tract Infections can affect these screening tests, and need to be controlled first. Because of all this variability, interpreting these tests can be problematic, and it is not uncommon to repeat them in the future to look for consistent findings and monitor trends.