Used in biomedical research to detect and quantify protein disulfide isomerase (PDI) levels in biological samples such as cell lysates, serum, or tissue extracts. This ELISA kit is particularly valuable in studies related to endoplasmic reticulum stress, unfolded protein response, and cellular protein folding. It supports research in neurodegenerative diseases, cancer, and thrombosis where PDI activity and expression are altered. The assay enables high-throughput, sensitive, and specific measurement of PDI, facilitating both basic science investigations and potential biomarker validation in clinical samples.