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Updated: May 22, 2026

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Published on: July 15, 2015
Normal and pathologic concentrations of uremic toxins
Flore Duranton1, Gerald Cohen, Rita De Smet
1RD-Néphrologie, Montpellier, France.
This review updates knowledge on uremic toxins in chronic kidney disease (CKD). It identifies new solutes and provides updated concentration data, aiding future research on toxin effects.
Area of Science:
- Nephrology
- Biochemistry
- Toxicology
Background:
- Uremic toxins are a significant concern in chronic kidney disease (CKD).
- Previous reviews have classified these toxins, but updated information is needed.
- Understanding uremic toxin concentrations is crucial for managing CKD progression.
Purpose of the Study:
- To update the classification and concentration data of uremic retention solutes.
- To identify newly reported solutes associated with uremic toxicity.
- To facilitate the design of experimental studies on the biologic effects of uremic toxins.
Main Methods:
- Conducted a literature search for articles on uremic toxicity published after 2003.
- Analyzed 87 records reporting serum or blood solute measurements in CKD patients.
- Identified and categorized previously known and newly reported uremic solutes.
Main Results:
- Identified 32 known and 56 newly reported uremic solutes from 621 reviewed articles.
- Commonly reported solutes include beta2-microglobulin, indoxyl sulfate, homocysteine, uric acid, and parathyroid hormone.
- Observed updated concentration data for several solutes, with some showing increased and others decreased uremic levels compared to previous reports.
Conclusions:
- This review provides an updated classification of uremic retention solutes and their concentrations.
- The findings extend the understanding of solute changes in CKD.
- This updated knowledge base will support the design of future research investigating the biological impacts of uremic toxins.
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