Used in life science research to detect and quantify activin A levels in biological samples such as cell culture supernatants, serum, and plasma. Widely applied in studies related to reproductive biology, inflammation, immune regulation, and tissue repair. Enables researchers to monitor activin A expression in disease models including fibrosis, cancer, and metabolic disorders. Supports high-throughput screening and preclinical evaluation of therapeutic agents targeting the TGF-β signaling pathway. Provides a reliable, sensitive, and specific measurement method for both in vitro and in vivo experiments.