For the BD FACSVia system: The BD CS&T Beads are intended for use on the BD FACSVia flow cytometer system with BD FACSVia clinical software for the verification of optical and fluidic performance and to adjust compensation on the flow cytometer. For the BD FACSLyric flow cytometer: BD CS&T beads, in conjunction with BD FACSuite Clinical software, provide a standardized method for the quality control of optics, electronics, and fluidics, and for adjusting detector voltages and fluorescence compensation on the BD FACSLyric flow cytometer.