Patent ID: 6979570

Claim:
A particle analyzer including a cytometer comprising: a detector for detecting a first characteristic parameter, a second characteristic parameter and a third characteristic parameter from particles in a liquid sample being analyzed; first classifying means for classifying particles in the liquid sample into leukocytes and other particles based on the first and second characteristic parameters; second classifying means for classifying the leukocytes in the liquid sample into a plurality of subclasses based on the second and third characteristic parameters; first calculating means for calculating the number N of particles in all of the leukocytes classified by the first classifying means; second calculating means for selecting certain specific subclasses from the plurality of subclasses of leukocytes, for calculating the number of particles in the specific subclasses, and for obtaining the sum M of the numbers of the particles in the specific subclasses; means for comparing the number N with the sum M; and means for determining that a classification error exists if N<M.