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Maropitant citrate is also a good appetite stimulant.
Hypoadrenocorticism in cats is very rare but you can find some literature on this topic. Most of the cats have undergone the diagnosis of hypoadrenocorticism based on an ACTH stimulation test using 0.125mg of synthetic ACTH via IV while observing the flat line before and after the stimulation.
In dogs, Addison's disease cannot be completely ruled out when the baseline cortisol is under 2 (you need to do the full ACTH stimulation test), while the baseline cortisol above 2 can rule out Addison’s disease. We currently do not have such a diagnostic protocol established in cats.
Since Addison's disease is very rare in cats, it may be best to perform the ACTH stimulation test to confirm the diagnosis rather than relying only on a single value of the baseline cortisol.
Please feel free to contact your local internists regarding patients with complicated endocrinopathy if available.