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 the attachment of antibodies or antigens, facilitating 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 release them in a controlled manner. Their uniform size and surface properties make them ideal for use in various laboratory techniques, including microscopy and particle analysis.