Estimated urinary protein excretion = Urinary creatinine × Random urinary protein / Random urinary creatinine

Urinary protein has certain diagnostic significance for some kidney diseases. When urinary protein quantification >120mg/24h urine, it is called proteinuria, which is divided into mild, moderate, and severe proteinuria. The causes of proteinuria are divided into physiological proteinuria, postural proteinuria, and pathological proteinuria. Pathological proteinuria is further divided into glomerular proteinuria, tubular proteinuria, mixed proteinuria, tissue proteinuria, and overflow proteinuria.