It is essential that all flow cytometers are fully qualified and monitored to ensure that the output generated is reproducible and precise. When flow cytometric assays are incorporated into global clinical trials the instrument qualification and monitoring must also include cross-standardization. This poster describes an approach for instrument performance qualification (PQ) and cross-standardization of two BD® FACSymphonyA5, Spectrally Enabled, 5-laser (349nm, 405 nm, 488 nm, 561 nm, and 637 nm), 48-color flow cytometers.