The BD Leucocount™ Kit consists of the BD Leucocount™ Reagent (propidium iodide fluorescent dye) and BD Trucount™ Tubes and is intended for use with the BD FACSCalibur™, BD FACSort™, BD FACScan™, and BD FACSVia™ Flow Cytometer Systems or with a flow cytometer equipped with a 488-nm argon ion laser able to threshold on FL2, for enumerating residual white blood cells (rWBCs) in leukoreduced blood products. For in vitro diagnostic use.