Patent ID: 7092078

Claim:
A flow cytometer, comprising: a flow cell, through which a blood sample containing leukocytes flows; a light source, which emits a light beam in a first direction, the light beam to be incident into the flow cell and scattered by the blood sample as scattered light; a first detector, which detects an intensity of forward small scattered light out of the scattered light, the first detector arranged so as to have a maximum angle of a detection angle range for the forward small scattered light stemmed from the first direction at a position outside of the flow cell, which is 4 degrees or less; a second detector, which detects an intensity of forward large scattered light out of the scattered light; and a processor, which classifies the leukocytes so as to prepare a scattergram in which monocytes and lymphocytes contained in the blood sample are distinguishably distributed on a plane defined by a first axis associated with the detected intensity of the forward large scattered light and a second axis associated with the detected intensity of the forward small scattered light.