Used in research settings to quantitatively measure indoxyl sulfate levels in human biological samples such as serum, plasma, or urine. Indoxyl sulfate is a uremic toxin associated with kidney dysfunction and is studied in relation to chronic kidney disease progression, cardiovascular complications, and oxidative stress. The kit enables high-throughput analysis in clinical and preclinical studies, supporting investigations into metabolic disorders, toxin accumulation, and the effectiveness of dialysis or therapeutic interventions. It is also applied in toxicology and nephrology research to understand gut-kidney axis interactions and the role of dietary metabolites in disease.