Blood urea nitrogen, blood creatinine at the same time down to normal values can generally suggest that the basic recovery of renal function, but also need to be based on the patient’s glomerular filtration rate to make a comprehensive judgment. Blood creatinine and urea nitrogen are clinically important indicators of renal function, which are of great significance in reflecting renal function. Urea: Urea is the end product of protein metabolism in the organism, which is mainly excreted from the urine through glomerular filtration. The production of urea increases significantly and the blood urea increases, when the renal function decreases, the excretion of urea decreases and the blood urea increases, when the renal function recovers, the excretion of urea is normal and the blood urea decreases. Serum creatinine: blood creatinine is the metabolism product of muscle tissue in the body, which is generally not elevated at the beginning of renal function injury, and shows elevated creatinine only when the injury reaches a certain degree. To sum up, the decrease of blood creatinine and urea back to normal usually indicates the recovery of renal function, but not absolutely; at the same time, renal diseases such as glomerulonephritis and other diseases may recur, so it is recommended that the patients should consult the hospital in time if they have any discomfort, and take active treatment under the guidance of the doctor.