My senior cat's T4 is high. Does she need hyperthyroidism meds now?
Updated On September 23rd, 2025
Pet's info: Cat | Domestic Shorthair | Female | spayed | 13 lbs
I have changed vets recently. The new vet recommended a blood test for my cat. The result of the thyroid test was 4.9. A free T4 was done as a follow up to the thyroid testing done last week,, and that was a little bit elevated., The vet said the numbers are suggestive of hyperthyroidism. She said a symptom would be weight gain. My cat now weighs about 13 lbs and she is a senior cat. There is nothing different in her behavior. The vet wants to put my cat on medication now. What is your advic
2 Answers
Most Helpful Answer
Published on March 8th, 2018
Hi, thanks for using Petco Pet Education Center, formerly Petcoach! Symptoms of hyperthyroidism (over active thyroid) in cats are: weight LOSS not gain, increased thirst and urination, increased hunger and vocalizing especially at night. They can have heart murmurs and arrhythmia. The side effects on not treating is heart disease and weight loss. I recommend treating if her T4 is above the high end of the reference range. Please feel free to post her blood work results. I hope this helps and I wish Sofi the best!
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Related Answers from Veterinarians
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Published on March 6th, 2020
Although most cats with hyperthyroidism will have elevated T4 and fT4, there is a condition known as 'occult hyoerthyroidism' there the T4 is otherwise suppressed and only fT4 appears above reference range. The increased appetite, weight loss and normal glucose (lack of diabetes) all increase suspicion of thyroid disease. Repeated blood tests and hills y/d food to limit iodine intake would all be helpful and you should discuss your concerns about treatment with the prescribing vet - we are not in a position to alter the prescribed medications
1Pet Parents found this answer helpful
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