Patent ID: 7943383

Claim:
An apparatus which automatically counts a white blood cell in a blood sample, comprising: an output device; and a controller configured to perform operations comprising: obtaining a first white blood cell number by performing a first classification to classify white blood cells contained in a blood sample into at least four groups, and totaling a number of the white blood cells belong to the at least four groups, based on first measurement data obtained by measuring a first measurement sample prepared from the blood sample and a first reagent, the first measurement data having first and second optical information as parameters; obtaining a second white blood cell number by performing a second classification to classify white blood cells contained in the blood sample into basophils and other white blood cells, and totaling a number of the white blood cells belong to the basophils and the other white blood cells, based on second measurement data obtained by measuring a second measurement sample prepared from the blood sample and a second reagent different from the first reagent, the second measurement data having the second optical information and third optical information as parameters; determining whether the second white blood cell number includes a number of particles other than the white blood cells, based on at least one of the first measurement data and the second measurement data; and controlling the output device so as to output the first white blood cell number without outputting the second white blood cell number, when it has been determined that the second white blood cell number includes the number of the particles other than the white blood cells.