Latex beads, carboxylate-modified polystyrene, are widely used in biomedical research and diagnostics due to their uniform size and surface functionality. They serve as essential tools in immunoassays, where they are coated with antibodies or antigens to detect specific biomolecules. These beads are also utilized in flow cytometry for cell sorting and analysis, as their carboxylate groups allow for easy conjugation with various biomolecules. Additionally, they play a role in drug delivery systems, where they can be loaded with therapeutic agents and targeted to specific tissues or cells. In material science, they are employed as calibration standards for particle size analyzers and in the development of advanced coatings and composites. Their versatility and modifiable surface make them valuable in a wide range of scientific and industrial applications.