The BD FACSCount system is a compact, self-contained system, incorporating instrument, reagents, and controls, for automatic counting of CD4, CD8, and CD3 T lymphocytes. The BD FACSCount system uses whole blood, eliminating lyse and wash steps. A unique software algorithm automatically identifies the lymphocyte populations of interest. Easy to use, cost effective, and reliable in the clinical laboratory, the BD FACSCount system has made HIV/AIDS monitoring easy in all types of labs for over 12 years.