Hello. Thanks for writing in. My name is***** and I would be happy to help you. I am not set up to do phone calls but would be happy to answer any questions you do have online. In order to give an informative and concise answer, it may take a few minutes before I respond back to you, so don't be alarmed if you don't hear back immediately if you have responded back to me within 10 minutes of my response. I do have a couple more questions, though, to see if I can better assess your situation.
Does he have any vomiting or diarrhea?
Thanks for the information. With the blood tests, I assumed that they checked liver and kidney enzymes, blood cell counts, protein levels, calcium levels and blood glucose; or they will do that tomorrow? If all that is negative, I would definitely be looking at the thyroid. Normally, with a hyperthyroid cat, there will be an elevated T4, but if they are sick for some other reasons, it is possible that the T4 could be normal. Not common but is possible. I would consider asking your vet to run a full thyroid panel. That would include a T4, a Free T4 and a TSH. That may give a better indication of the thyroid function. A thyroid antibody test can't hurt, but it is as important to do as in dogs. If the thyroid values all seem normal, though, I would really be thinking about inflammatory bowel disease or intestinal lymphoma. Either of these diseases can produce symptoms very similar to hyperthyroidism in cats. Please let me know if you have any other questions or concerns. Hope this helps.
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It looks like they checked basic blood work (complete blood cell count, serum chemistries and electrolytes) with the Feline Leukemia and Feline AIDs testing. I would request a Thyroid profile and even consider a GI panel that tests Feline Pancreatic Lipase, TLI and serum cobalamin/folate. I did forget to mention that some of these cats may have a chronic, low grade pancreatitis that eventually lead to pancreatic insufficiency and inability to digest and absorb food normally. Hope this helps.
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I am not set up to make phone calls, but I can answer any questions you may have online still.