A method of controlling a blood analyzer for measuring platelets is provided. The method comprises: determining a relationship between at least one first measurement value obtained by detecting platelets in at least one previous test by an electrical type detector of the blood analyzer and at least one second measurement value obtained by detecting the platelets in the at least one previous test by an optical type detector of the blood analyzer, and controlling the blood analyzer to prepare the first and/or second measurement sample for a current test according to the determined relationship.

An optical flow cytometer for blood cell characterization, comprising: a flowcell providing a blood cells flow, at least one light-emitting diode for illuminating blood cells that are flowing in the flowcell, an epifluorescence module in which a same first lens group is used for focusing theexcitation light in the blood cells flow and for collecting fluorescence light coming from each blood cell, and a unitary photodetector for detecting the epifluorescence light coming from the first lens group, at least one of the following measurement modules includes: a light scattering measurement module, an axial light losses measurement module, a particle impedance measurement module.

The analysis method includes a step of measuring cytometry parameters for each biological cell contained in a biological sample; a step of determining, for each biological cell of the biological sample, a point in a N-dimensional space whose coordinates are defined depending on the cytometry parameters measured for the corresponding biological cell, where N is an integer greater than or equal to 3; a step of automatic clustering of the points into different cell clusters depending on the measured cytometry parameters, so as to define a sample cluster file; and a step of comparing the sample cluster files with reference cluster files, each of the reference cluster files being defined from cytometry parameters of a respective pathological or abnormal biological sample.