Latex beads made of polystyrene are widely used in various scientific and industrial applications due to their uniform size, stability, and ease of functionalization. In biomedical research, they serve as calibration standards for flow cytometry and microscopy, enabling precise measurement and analysis of cell populations. These beads are also employed in immunoassays, where they act as solid supports for the immobilization of antibodies or antigens, facilitating the detection of specific biomolecules. In diagnostics, they are utilized in lateral flow assays, such as pregnancy tests, to provide visible signals for result interpretation. Additionally, polystyrene latex beads are used in drug delivery systems, where they can encapsulate or adsorb therapeutic agents for targeted release. In material science, they are incorporated into coatings, films, and composites to enhance properties like strength, texture, or optical characteristics. Their versatility and adaptability make them a valuable tool across multiple fields.