Used for the quantitative measurement of thioredoxin reductase (TR) activity in human biological samples such as serum, plasma, and cell lysates. This ELISA kit enables researchers to assess oxidative stress levels and redox status in various disease conditions including cancer, neurodegenerative disorders, and inflammatory diseases. It is widely applied in clinical research and drug development to evaluate the impact of therapeutic agents on cellular antioxidant systems. The assay is suitable for high-throughput screening and provides a reliable, sensitive, and specific detection method for TR activity, supporting studies in immunology, oncology, and molecular biology.