The kidney function labs mainly look at the blood creatinine, the blood creatinine is elevated indicating the decline in kidney function, if the blood creatinine >707umol/L, it means that the patient enters the end stage of chronic renal failure, that is, the uremic phase, if the blood creatinine is at a critical high value, it is necessary to improve the relevant tests,, for example, to check the urinary routine. Because creatinine value is affected by age, gender, muscle activity, nutritional status, so it is recommended that patients check endogenous creatinine clearance for further investigation. If endogenous creatinine clearance decreases, it can be initially determined that renal function is declining, and hospitals with conditions can do renal ECT to objectively assess glomerular filtration rate and perform assessment of renal function.