Patent ID: 7465584

Claim:
A method for classifying leukocytes in canine or feline blood, comprising the steps of: preparing a measurement sample by mixing a canine or feline blood sample with a lysing reagent, the lysing reagent comprising a first alkyl trimethyl ammonium salt having an alkyl group having a carbon number of 10 to 12 and a second alkyl trimethyl ammonium salt having an alkyl group having a carbon number of 16 to 18, wherein erythrocytes are lysed and leukocytes are shrunk in the measurement sample; measuring data correlated with the size of leukocytes in the measurement sample; and classifying the leukocytes, on the basis of the measured data, into a first group consisting essentially of lymphocytes, a second group consisting essentially of neutrophils and monocytes and a third group consisting essentially of eosinophils.