The ratio of urinary NAG to urinary creatinine is usually converted to the same unit of mg/dL by multiplying the value of urinary NAG by 2.8 and dividing the value of urinary creatinine by 88.4. The converted ratio of urinary NAG to urinary creatinine is 15-25:1, with an average of 20:1. The ratio of urinary NAG to urinary creatinine reflects the function of the renal tubules, and an elevated ratio suggests tubular disease. If urine NAG is used alone to determine renal tubular function, it may have some limitations. Because urinary NAG is affected by many factors, such as the concentration of urine will also make urinary NAG rise. Therefore, the ratio of urinary NAG to urinary creatinine to reflect renal tubular function can more accurately reflect the degree of renal tubular injury, which is more commonly used in clinical practice. Urine NAG to urine creatinine ratio is mainly used in the screening of kidney disease, early detection of kidney disease and give intervention, if the patient found that the urine NAG to urine creatinine ratio is elevated, it is recommended to go to the regular hospital in time, complete the examination to clarify the cause of the disease, and then under the guidance of the doctor to give targeted treatment or therapy.