You can drink water in the morning of the kidney function test, even for liver function tests such as gluten C and gluten grass, the only thing that is affected is the blood glucose level. If you need to measure fasting blood sugar, fasting is recommended. In the examination, digestive ultrasound and abdominal CT need to fasting, abdominal urological examination need to drink water, all and urological related ultrasound, CT, all need to hold urine, otherwise with the ovaries and so on is difficult to differentiate, can not clarify the kidney disease. Renal function test, can clarify the infection or renal insufficiency, nephritis, nephrotic syndrome and other items. It is recommended to actively cooperate with medical advice to get the most correct and accurate test results.