Blood analyzer and blood analysis method

A blood analyzer comprising:

• a specimen preparation unit configured to mix a blood sample with a hemolyzing agent which hemolyzes red blood cells and with a fluorescence-labeled antibody reagent which labels a predetermined surface antigen on blood cells, to prepare a first measurement specimen;
• a flow cell through which the first measurement specimen prepared by the specimen preparation unit is caused to flow;
• a light source unit configured to emit light to the first measurement specimen flowing in the flow cell;
• light receivers configured to respectively receive first scattered light, second scattered light, and first fluorescence which are derived from blood cells in the first measurement specimen in response to the emission of the light;
• and
• a processing unit configured to identify and count lymphocytes in the first measurement specimen by using first scattered light information based on the first scattered light and second scattered light information based on the second scattered light, and configured to identify and count blood cells having thereon the predetermined surface antigen in the first measurement specimen by using first fluorescence information based on the first fluorescence, wherein the processing unit is configured to differentiate between eosinophils and cells identified by fluorescent labelled antibody by using second scattered light information based on the second scattered light and the first fluorescence information based on the first fluorescence, and count each of the eosinophils and the cells identified by the fluorescent labelled antibody.