For use as an isotonic buffered diluent in conjunction with a lytic reagent for counting and sizing blood cells on HmX hematology analyzers. Use with only COULTER LYSE S III diff lytic reagent. Refer to your instrument product manuals and/or online help, as applicable.  Blood cell analysis comprises diluting a whole-blood sample with a solution that functions as a diluent. The diluent provides the ability to analyze portions of the diluted blood sample for different blood cell types, such as red blood cells and platelets. When combined with a lytic reagent, the diluent is useful in the determination of hemoglobin, the enumeration of leukocytes (white blood cells), and the derivation of leukocyte subpopulations.