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Under normal circumstances, human urine contains no protein or only a small amount of protein. However, when the kidney is diseased, when protein, which flows with blood circulation, flows through the kidney, protein "slips through the net" because of the decrease of renal filtration function.
Medical journals show that high urinary protein means high protein content in urine, and protein leaked into urine and excreted from urethra to form proteinuria. The higher the urinary protein, the worse the renal filtration function, which is an important index to measure renal function.