Used in biomedical research to quantify Herceptin (trastuzumab) concentration in biological samples such as serum or plasma. Commonly applied in pharmacokinetic studies, monitoring drug levels during clinical trials, and assessing therapeutic efficacy in HER2-positive breast cancer research. Enables researchers to evaluate immune response and optimize dosing regimens. Widely used in laboratory settings for quality control and assay development in biopharmaceutical research.