Proteinuria (proteinuria)

Japanese: タンパク尿(蛋白尿) - たんぱくにょう（英語表記）proteinuria

This refers to a state in which a certain amount or more of protein is excreted in the urine, and the excreted protein is called urinary protein. Normally, the glomeruli of the kidneys allow substances with a molecular weight of 10,000 or less to pass through relatively easily, but only very small amounts of substances with a molecular weight of several tens of thousands or more, such as plasma proteins, pass through. Therefore, in the urine of healthy people, there are very small amounts of proteins that have passed through the glomeruli, as well as small amounts of proteins originating from the renal tubules and urinary tract (an average of 40 to 80 mg per day). However, the amount of protein in the urine can increase after strenuous exercise, when under mental stress, when in a certain position such as standing or lying down, or when there is a fever.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

尿中にタンパク質がある一定量以上排出される状態をいい，排出されたタンパク質を尿タンパクという。ふつう，腎臓の糸球体では分子量1万以下の物質は比較的容易に通過するが，血漿タンパク質などのように分子量数万以上の物質はきわめて微量にしか通さない。したがって，健康人の尿中にはこのような糸球体を通過したごく微量のタンパク質と，尿細管や尿路に由来するタンパク質が微量に存在している(1日平均40～80mg)。ところが激しい運動後や精神的ストレスのあるとき，立位や臥位など一定の姿勢をとったとき，また発熱時には，尿中のタンパク質量が増加することがある。

出典　株式会社平凡社世界大百科事典第２版について　情報

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