尿毒症毒素的滞留及产生增多会引发一系列尿毒症症状，对全身多系统产生影响，导致患者生活质量下降和高死亡率。2003年欧洲尿毒症毒素(the European Uremic Toxin，EUTox)工作组根据尿毒症毒素的物理化学特性将其分为水溶性小分子化合物、蛋白结合型化合物、中分子化合物三类。随着对尿毒症溶质的新认识、来源的新数据和血液透析方法及膜材料的进展，既往的分类已经不能完全适应血液净化领域的新进展。因此，2020年11月—12月Claudio R作为大会主席召开了一次专家会议并编写了一份专家共识，提出了对尿毒症毒素定义及分类的新见解。本文详述了专家组关于尿毒症毒素的新定义及更具临床导向性的新分类的共识建议。

?The retention and increase of uremic toxin will lead to a series of uremic symptoms, which will affect many systems of the whole body, and lead to the decline of patients' quality of life and high mortality. In 2003, the European Uremic Working Group classified uremic toxins into three groups according to their physical chemistry properties: water-soluble small molecule compounds, protein-binding compounds, and middle molecule compounds. With the new understanding of uremic solutes, the new data of sources and the development of hemodialysis methods and membrane materials, the previous classification can not fully adapt to the new progress in the field of blood purification. Accordingly, in november-december 2020, Claudio R, as president of the General Assembly, convened an expert meeting and prepared an expert consensus that provided new insights into the definition and classification of uremic toxin  tails the expert group's consensus recommendations for new definitions and more clinically oriented new classifications of uremic toxins.