Latex beads, carboxylate-modified polystyrene, are widely used in biomedical research and diagnostics due to their uniform size and surface functionality. They serve as excellent carriers for the immobilization of biomolecules such as antibodies, proteins, and nucleic acids, making them essential in immunoassays, flow cytometry, and cell separation techniques. Their carboxylate groups enable easy conjugation with targeting ligands, enhancing specificity in applications like targeted drug delivery and imaging. Additionally, these beads are utilized in calibration standards for particle size analyzers and as model systems in colloidal science studies. Their biocompatibility and customizable surface properties make them a versatile tool in both research and clinical settings.