High creatinine in cats does not necessarily mean renal failure, but renal failure will cause high creatinine and high urea nitrogen. Normal cat creatinine is below 140. If it is higher than 140, it may be renal failure. It is best to Take the cat to the pet hospital for a urine test to confirm whether it is renal failure.
Tips:
Usually, the cat should drink more water to promote urination. Do not feed the cat food that is too salty or too oily to avoid causing kidney disease.