Latex beads made of polystyrene are widely used in biomedical research and diagnostics. They serve as calibration standards in flow cytometry, helping to ensure the accuracy and consistency of cell analysis. These beads are also employed in immunoassays, where they act as solid supports for the immobilization of antibodies or antigens, enhancing the detection of specific biomolecules. In addition, polystyrene latex beads are utilized in the development of drug delivery systems, where they can encapsulate therapeutic agents and provide controlled release. Their uniform size and surface properties make them ideal for use in various laboratory applications, including cell separation and protein purification. Furthermore, they are used in educational settings to demonstrate principles of colloidal chemistry and particle behavior.