Used in hematology for diluting whole blood samples to facilitate accurate counting of white blood cells (WBC) in a hemocytometer or automated cell counter. The diluent lyses red blood cells while preserving the integrity and countability of white blood cells, enabling clear differentiation and enumeration. Commonly used in clinical laboratories for diagnostic testing, such as in complete blood count (CBC) procedures, infection assessment, and monitoring immune system status. Provides consistent and reliable results when properly formulated, ensuring minimal cell distortion or clumping.