Lab value · T4
Total T4 (thyroid) in cats, explained
T4 is a thyroid hormone. Hyperthyroidism is common in older cats and often occurs alongside CKD.
What a higher total t4 (thyroid) can mean
A higher T4 suggests hyperthyroidism. Treating it can change kidney values — so your vet will watch both together.
What a lower total t4 (thyroid) can mean
A lower T4 can occur with thyroid treatment or illness.
Questions to ask your vet
Ask your vet
- How might treating my cat’s thyroid affect their kidney values?
Decode your cat’s T4
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Frequently asked questions
What is Total T4 (thyroid) in a cat blood test?
T4 is a thyroid hormone. Hyperthyroidism is common in older cats and often occurs alongside CKD.
What does a high total t4 (thyroid) mean in cats?
A higher T4 suggests hyperthyroidism. Treating it can change kidney values — so your vet will watch both together.
What does a low total t4 (thyroid) mean in cats?
A lower T4 can occur with thyroid treatment or illness.
What is a normal total t4 (thyroid) level for a cat?
A typical feline reference interval is about Example only: 0.8 – 4.7 µg/dL. Use the range printed on your cat’s report — it differs between labs., but every lab sets its own range. The range printed on your cat’s report is the one to use.
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