Patent claim: A blood analyzer comprising a sample preparation portion configured to prepare a first measurement sample from a blood specimen and a first reagent and second measurement sample from a blood specimen and a second reagent a light source configured to irradiate the first measurement sample and the second measurement sample with light a light receiving portion configured to receive fluorescence and scattered light from cells in the first measurement sample which is irradiated with light by the light source to output a first fluorescence signal relating to the received fluorescence and a first scattered light signal relating to the received scattered light and configured to receive fluorescence and scattered light from cells in the second measurement sample which is irradiated with light by the light source to output a second fluorescence signal relating to the received fluorescence and a second scattered light signal relating to the received scattered light and a cell analysis portion configured to perform a first detection process to detect abnormal lymphocytes based on the first fluorescence signal and the first scattered light signal and a second detection process to detect nucleated erythrocytes based on the second fluorescence signal and the second scattered light signal wherein the cell analysis portion is configured to perform a determination process for determining whether abnormal lymphocytes are present in a blood specimen based on the results of the first detection process and the second detection process.

Related passage: Fig.13A is a scattergram particle size distribution of sidescattered light intensity and side fluorescenceintensity in the first measurement data.Fig.13B is a scattergram of forwardscattered light intensity and side fluorescence intensity in the first measurement data.On the scattergram of sidescattered light intensity and side fluorescence intensity in the first measurement data shown in Fig.13A there are appeared a cluster of myeloblasts a cluster of immature granulocytes a cluster of basophils a cluster of a blood cell group composed of neutrophils and eosinophils a cluster of lymphocytes a cluster of monocytes and a cluster of a lymphoblastnucleated red blood cell group.In addition on the scattergram of forwardscattered light intensity and side fluorescence intensity in the first measurement data shown in Fig.13B there are appeared a cluster of a blood cell group composed of immature granulocytes and myeloblasts a cluster of granulocytes a blood cell group composed of neutrophils eosinophils and basophils a cluster of monocytes a cluster of lymphocytes and a cluster of a lymphoblastnucleated red blood cell group.As shown in these scattergrams the use of the fluorescence intensity of the first measurement data can provide discrimination of the lymphoblastnucleated red blood cell group cluster from other clusters.In processing of Step S302 the CPU 51a distinguishes the lymphoblastnucleated red blood cell group from other clusters using sidescattered light intensity and fluorescence intensity of the first measurement data and therefore detects thelymphoblastnucleated red blood cell group Step S302A.And the CPU 51a counts the number of blood cells contained in the detected lymphoblastnucleated red blood cell group Step S302B.