Protein drugs such as hormones, enzymes, cytokines, antitoxins, and immunoglobulins play a critical role in modern therapeutics. Our Protein Drugs Monitoring ELISA Kits are designed to support pharmacokinetic (PK) studies, therapeutic drug monitoring (TDM), and immunogenicity research. With high sensitivity, specificity, and batch-to-batch consistency, these kits enable accurate quantification of therapeutic proteins in human serum or plasma.