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肾小球滤过膜由于存在孔径屏障和电荷屏障,对血浆蛋白质有选择滤过作用.选择性尿蛋白指数(selectivity proteinuria index,SPI)可通过比较血浆中不同分子量大小的蛋白质的肾脏清除率来反映肾小球滤过膜的损伤程度及活跃肾单位整体通透性的改变,不但操作简便,适用于有肾活检禁忌证的患者和无肾活检条件的地区,还可以弥补肾活检...