Used to measure the activity of Protein Disulfide Isomerase (PDI) in human biological samples such as plasma, serum, or cell lysates. This assay is commonly applied in research related to thrombosis, cardiovascular diseases, and neurodegenerative disorders where PDI plays a key role in protein folding and cellular stress response. The kit enables quantitative detection of PDI enzymatic activity, supporting studies on disease mechanisms, drug development, and biomarker validation. It is especially useful in investigating PDI release during platelet activation and its involvement in blood clot formation.