The urine albumin creatinine ratio is normally less than 30 mg/g. Urine albumin creatinine ratio is mostly used to assess renal injury and clarify the presence of pathologic states. It is widely used for early screening of renal disease, evaluation of the efficacy of treatment, and guidance of drug application. The urine albumin/creatinine ratio is normally <30mg/g, 30~300mg/g for microalbuminuria, >300mg/g for clinical proteinuria. Meanwhile, elevated urine albumin creatinine ratio is mostly related to renal diseases, common ones are nephrotic syndrome, chronic glomerulonephritis, diabetic nephropathy, rheumatoid nephritis and so on. In addition, some tumors or trauma may also lead to changes in the ratio. If patients find that the urine albumin creatinine ratio is elevated, it is recommended to go to the regular hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy under the guidance of the doctor.