The assay provides total RBC and WBC values for the Abbott CELL-DYN® 3200, 4000, Sapphire™ and Ruby™; Beckman Coulter® LH 750/LH 755 and LH 780 (levels 2 and 3 only); and Sysmex® XE-2100™, XT-2000i™, and XT-1800i™ instruments. Cell-Chex Auto is a three-level control packaged in a plastic 3.0ml vial with a pierceable cap. Cell-Chex Auto has 75-day closed-vial stability and 30-day open-vial stability when stored at 2¡-10¡C.