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Under normal circumstances, human urine contains no protein or only a small amount of protein. When the kidney is sick, when protein flows through the kidney with blood circulation, protein "slips through the net" due to the decline of the renal filtration function.
According to medical journals, high urinary protein means high protein content in urine, and protein leaks into urine and excretes through urethra to form proteinuria. The higher the urinary protein, the worse the renal filtration function, which is an important index to measure renal function.