Latex beads made of polystyrene are widely used in biomedical research and diagnostics. They serve as calibration standards in flow cytometry, helping to ensure accurate measurements of cell size and fluorescence intensity. These beads are also employed in immunoassays, where they act as solid supports for antibodies or antigens, facilitating the detection of specific biomolecules. In addition, polystyrene latex beads are utilized in the development of biosensors, where their uniform size and surface properties enhance sensitivity and reproducibility. They are also used in drug delivery systems, where they can encapsulate therapeutic agents and release them in a controlled manner. Furthermore, these beads are applied in material science for the creation of model colloids to study the behavior of particles in various environments.