A cyanide-free lytic reagent composition and method for measuring the total hemoglobin concentration in a blood sample, for counting the number of leukocytes and for deferential counting of leukocyte subpopulations are described. The cyanide-free lytic reagent composition cotains a quaternary ammonium...http://www.google.com.au/patents/US5882934?utm_source=gb-gplus-sharePatent US5882934 - Composition and method for hemoglobin and cell analysis
