A relative came to the provincial capital to see a doctor, said it was not good to eat, see the gastroenterology department, the results of a check is uremia, Mr. Wang was surprised by the results of his relatives, incidentally, they also did a comprehensive examination, fortunately safe and sound. Kidney disease is a silent killer, in many cases not easy to be detected, early discomfort symptoms may also be ignored, many even if the patient has entered the uremic phase of patients, may be found because of anemia, gastrointestinal nausea, vomiting or other clinical manifestations in non-nephrology department after further examination. In fact, the easiest and most effective way to rule out early detection of kidney disease, whether or not there is edema, hematuria, foamy urine and other manifestations of kidney disease, is to check the urine. A seemingly simple urine test can indeed initially screen for early signs of disease hidden in the kidneys and even other organs of the body such as the liver and endocrine system. Urinalysis includes routine urine analysis, detection of organic components in urine (such as urine red blood cells, white blood cells, etc.), quantitative determination of protein components, and urine enzyme determination. If problems are found, further urine tests such as urine organic fraction analysis and ultrasound, blood creatinine and other kidney function indicators can be done under the advice of a nephrologist. A simple urinalysis in a tertiary care hospital costs only a dozen dollars and the results can be ready in a few minutes. Therefore, do not miss the urine test when you go for a systematic physical examination or your own physical examination. Of course, the retention of urine should be standardized and sent in a timely manner to avoid false positives or false negatives due to contamination or irregular retention. The correct retention of urine: women should avoid menstruation; should stay in the middle of the urine, as far as possible, is the morning urine (the first urine in the morning before eating); to avoid the interference of certain drugs. Experts recommend that the general public regularly check urine routine once a year; cardiovascular disease patients, long-term anemia, older people with frequent bone pain, and people who use high doses of antibiotics after repeated infections, every six months.