My grandfather is about 90 years old and his creatinine value is 3.11.. his urea is 80. His blood pressure is all under control.  what should be done. Especially tell me what diet to follow and what foods to avoid because I thinkIits because of wrong diet the value has gone high..
Hello and welcome to Chat Doctor. As a Urologist, I must assure that the urea and creatinine values, show your grandfather has kidney failure. A faulty diet, is not the cause of kidney failure. The most likely cause in an 80-year-old, is an obstructive prostate gland. That will need to be evaluated, with a urine culture, PSA, and an ultrasound scan of the abdomen. Treatment of prostate gland will depend on the reports. Dietary advice is to restrict salt intake to 6gm daily, avoid fresh fruits, coconut water and any potassium rich food. Also try to restrict protein intake more than 40gm daily. When you visit your nephrologist next, meet the dietitian and get the diet sheet. You must check your urea, creatinine, sodium, potassium and uric acid.  You may contact me for any doubts. Chat Doctor. Manga.