2.尿中低分子量蛋白的测定溶菌酶（lysozyme）、视黄醇结合蛋白（retinol-bindingprotein，RBP）以及尿中κ、λ轻链都属低分子量蛋白，绝大多数在肾近端小管重吸收，如果尿中浓度升高，往往说明肾小管回吸收功能减低。
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