SCr in medical terms means blood creatinine, which is a metabolic waste product of the human body, mainly from muscle tissue, and the daily production and excretion of blood creatinine are relatively constant. Since most of the blood creatinine needs to be excreted by the kidneys, the value of blood creatinine can reflect the good or bad kidney function, when the blood creatinine exceeds the normal value range, it indicates that there is renal insufficiency, more than 442μmoI/L can be diagnosed as renal failure, more than 707μmoI/L can be diagnosed as uremia. There are many clinical diseases that can cause high blood creatinine, such as chronic nephritis, diabetic nephropathy, hypertensive kidney damage, etc. Treatment plans need to be made according to the specific condition and cause of the patient. Once the kidney disease enters the uremic phase, renal replacement therapy needs to be started.