The ReadiUse™ 6-Color Human TBNK Antibody Kit for flow cytometry utilizes dried multicolor beads to delineate principal lymphocyte subsets - CD4+ T cells, CD8+ T cells, B cells, and NK cells – in whole blood specimens. Each TBNK dried reagent contains a cocktail of fluorescently-labeled monoclonal antibodies directed against human CD3, CD4, CD8, CD16, C19, CD45, and CD56. The kit is designed to be used in a “lyse/no-wash” format for quick and easy sample preparation, with less inconsistencies. Also included in this kit is a viability stain to identify dead cells and a precise number of fluorescent counting beads to determine absolute lymphocyte subset cell concentrations.