Why is my cat's potassium low if kidney tests are normal?
Updated On September 23rd, 2025
Pet's info: Cat | Domestic Shorthair | Male | neutered | 18 years old | 9.5 lbs
Hi my vet says Tony's potassium is low. On 12/28/17 it was 3.2, recheck on 1/3/18 was up to 3.6, and now a recheck today says he’s low again. His blood work shows kidney values and SDMA are normal but she thinks I should have him get a Kidney ultrasound. Any advice.. could this be a kidney issue even tho blood work says kidneys are normal. Fyi..other issues tony has, and takes meds for, are hi blood pressure and hyperthyroidism thanks!!!
2 Answers
Most Helpful Answer
Published on January 31st, 2018
Hello, sorry to hear about Tony. A low potassium may be secondary to a decrease dietary intake. However, if Tony is on amlodipine, then this can cause a low potassium as well. If his kidney values are normal, then it is less likely that he has kidney disease. I would recommend continuing to monitor him and if he is otherwise eating, drinking, and acting normally then you may not need to pursue an abdominal ultrasound at this point. Hope this helps and best of luck.
1Pet Parents found this answer helpful
Related Answers from Veterinarians
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Published on February 1st, 2018
That is great that Tony’s kidney values are normal! Depending on the lab results Tony will likely need to stay on potassium supplementation. That is something your veterinarian will determine, but based on the information you have shared, it is likely to be a long term treatment. The levels will need to be checked regularly and the dose might be adjusted. I hope Tony does well.
1Pet Parents found this answer helpful
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