Used in biomedical research to accurately measure proinsulin levels in rat serum or plasma samples. This assay is essential for studying insulin synthesis and beta-cell function in type 2 diabetes and metabolic syndrome models. Researchers use it to evaluate pancreatic response under experimental treatments, including drug therapies or dietary interventions. The kit supports high-throughput screening and provides reliable quantification, making it valuable in preclinical studies focused on glucose metabolism and insulin regulation.