尿酶有以下几类：①水解酶类：如N-乙酰-β-D氨基葡萄糖苷酶（N-acetyl-D-glucosaminidase，NAG）临床上应用较多，为溶酶体酶，不能为肾小球滤过，广泛存在于肾小管和泌尿道上皮细胞中。
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