Used to measure levels of thioredoxin-1 (Trx1) in human biological samples such as serum, plasma, or cell lysates. It is commonly applied in research settings to study oxidative stress, inflammation, and redox regulation in diseases like cancer, cardiovascular disorders, and autoimmune conditions. The kit enables accurate quantification of Trx1, supporting biomarker discovery and evaluation of therapeutic responses in clinical and preclinical studies.