Yes! Exactly the same thing happened to me. I stopped UT and my creatinine level dropped. I also found that I had an urgent need to pee whenever I did UT so I couldn't practise any more. This was about 6 months ago.
I still do UT eye baths.
I am about to do a blood test for something different so I will ask the doctor about creatinine levels and UT. Also, I should add, the urgent need to pee has returned so I might have other health issues