The normal value of 24-hour urine protein quantification is less than 150mg in 24 hours.Clinically, proteinuria is divided into two types: physiologic proteinuria and pathologic proteinuria. First of all, physiologic proteinuria is commonly found in adolescents, and it can be caused by strenuous exercise, fever, and so on. In physiologic proteinuria, urine protein is relatively small, usually not higher than (1+) number. Pathologic proteinuria, on the other hand, suggests kidney damage, such as acute and chronic glomerulonephritis, diabetic nephropathy, multiple myeloma nephropathy, lupus nephritis, etc., which suggests parenchymal kidney damage. Pathologic proteinuria, urine protein is more, also can be accompanied by hematuria. If the quantitative amount of urine protein exceeds 150mg in 24 hours, it is necessary to identify whether it is physiologic proteinuria or pathological proteinuria, which can be identified according to its clinical manifestations, and further examination, such as protein electrophoresis of urine, can be done to clarify the nature of proteinuria. If further examination, renal biopsy can be done to clarify the pathological type of renal injury and the degree of injury.