Device and method for performing a complete blood count and determining a sedimentation rate

A device for performing a complete blood count and determining a sedimentation rate, comprising:

• a first group arranged so as to sample a blood sample from a tube and to carry out a complete blood count on this sample;
• a second group arranged so as to sample a blood sample from a tube and to carry out a sedimentation rate determination;
• at least one sampling member controllable for a measurement by the first group and a measurement by the second group for sampling a blood sample so that the sample sampled for the first group is not used by the second group, and that the sample sampled for the second group is not used by the first group, the second group being provided with a sensor comprising an infrared light source and an optical sensor arranged substantially opposite one another around a tube connected to an output end of the at least one sampling member so that light emitted by the infrared light source reaches the optical sensor after having crossed said tube, the second group being further arranged so as to carry out a rinsing of the at least one sampling member and of the tube between two sedimentation rate measurement determinations and the optical sensor being arranged so as to carry out, after a rinsing operation, a blank measurement based on the light emitted by the infrared light source and crossing the tube in an absence of the blood sample;
• and
• a converter arranged so as to receive the blank measurement and one or more light transmission measurements from the optical sensor and to determine a sedimentation rate from a ratio between the blank measurement and the one or more light transmission measurements, wherein the converter is arranged so as to determine a time point of measurement of a lowest light transmission, and a time point of measurement of a final light transmission, and the optical sensor is arranged so as to implement a maximum gain between the time point of measurement of the lowest light transmission and the time point of measurement of the final light transmission, and to otherwise implement a minimum gain.