Creatinine 800, then means 800μmol/L, blood creatinine more than 707μmol/L or more, and the patient’s renal failure is chronic renal failure, then consider uremia, the patient’s creatinine 800 reached the diagnostic criteria. For patients with uremia, if hemodialysis is done, it is recommended to do it 3 times a week, 4 hours each time; if the patient’s urine output is still good, and the residual renal function is more than 5 ml/min, which is when the patient is willing to do it or asks for it, it can also be reduced to 2 times a week of dialysis, 4 hours each time. Ensuring the adequacy of dialysis is the basis for prolonging patients’ life and reducing complications.