The kidney is an important organ in the human body, which plays a very important role in maintaining the water-electrolyte balance, hemoglobin production and bone metabolism in the body. For kidney examination, we mainly check the kidney ultrasound, urine routine, blood creatinine and blood urea to evaluate the kidney condition. If these tests are normal, then there is nothing wrong with the kidney. In some early kidney injury, it often shows abnormal urine test, positive urine protein or occult blood, which often indicates early kidney disease, and further examination in the nephrology department of the hospital is needed, such as urine protein quantification, kidney ultrasound, or even kidney puncture to clarify the pathological type of the kidney. If there is an elevation of creatinine and urea, it often means there is a decrease of glomerular filtration rate, you can check the kidney ECT to evaluate the glomerular filtration rate specifically. When the kidney is damaged to a certain extent, some complications will occur, such as renal anemia and renal bone disease, and it is necessary to check the level of erythropoietin, as well as blood calcium and phosphorus and parathyroid hormone to assess the systemic condition. The treatment of kidney disease focuses on early detection, early diagnosis and early medication, which can delay or stop the deterioration of kidney function, pay attention to low salt and low fat, have a diet, avoid staying up late, overwork and overeating to avoid increasing the burden on the kidneys.