Latex beads, carboxylate-modified polystyrene, are widely used in biomedical research and diagnostics. They serve as essential tools in immunoassays, where they are coated with antibodies or antigens to detect specific biomolecules. These beads are also employed in flow cytometry for cell sorting and analysis, providing precise and reliable results. In addition, they are utilized in drug delivery systems to encapsulate and release therapeutic agents in a controlled manner. Their carboxylate groups enable easy surface modification, making them versatile for various bioconjugation applications. Furthermore, these beads are used in calibration standards for particle size analysis and instrument validation, ensuring accuracy in scientific measurements.