An accurate, fast and easy-to-use CD4 testing solution. The BD FACSPresto™ System includes the instrument, integrated software, sample incubation workstation and single-use disposable cartridges. The system is designed to provide absolute and percentage results of CD4 T lymphocytes and total hemoglobin (Hb) concentration in whole blood samples. The BD FACSPresto™ system is one of the most innovative testing solutions available. Its sophisticated technologies incorporate many checks to ensure quality and consistency of testing, and its user interface and workflow make the instrument very easy to learn, use, and maintain.