What level of creatinine 204μmol/L renal function is at usually needs to be assessed according to glomerular filtration rate to determine the severity of renal impairment, and cannot be generalized. Normal serum creatinine ranges from 53 to 106 μmoI/L in men and 44 to 97 μmoI/L in women, and creatinine 204 μmol/L suggests impaired renal function. Clinical laboratory data such as urea, creatinine, cystatin C, etc. are commonly used, combined with the patient’s gender, age, ethnicity and other information by a variety of formulas to derive the glomerular filtration rate, to assess the level of renal function, so as to determine the severity of renal impairment, and can not be generalized. For patients with elevated creatinine level, it is recommended to go to regular hospitals in time to improve the examination and clarify the cause of the disease, and then give targeted treatment or therapy under the guidance of doctors.