Cal-Chex is a whole blood product manufactured for calibrating multi-parameter hematology analyzers. Assigned values are derived from replicate analysis on whole blood calibrated hematology analyzers. Cal-Chex calibration material is available in plastic cap-pierceable vials for analyzer autosampling. Cal-Chex is assayed on Beckman Coulter, Abbott, Horiba Medical, Siemens Healthcare Diagnostics and Mindray hematology instruments and provides a cost-effective alternative to whole blood calibration procedures.