Due to first pass metabolism, the liver will have a much higher level of thyroid hormones than the rest of the tissues. (holtorfmed.com)
If the kitty had his annual physical, more weight loss would have been apparent and new blood levels would have been analyzed showing even higher levels of thyroid hormone. (askthecatdoctor.com)
Your cat will need to have its blood pressure checked in order to rule out hypertension, and the blood will be tested for high levels of thyroid hormones. (cattime.com)