A system for evaluating particles of a biological sample obtained from an individual, comprising: a volumeter assembly having a conduit adapted to receive a fluid suspension containing the particles therethrough, the conduit defining an axial conduit wall length having a central region of higher electrical resistivity disposed between a first distal region of lower electrical resistivity and a second distal region of lower electrical resistivity; a first chamber in fluid communication with a first orifice of the volumeter assembly conduit, the first chamber adapted to contain at least a first portion of the fluid suspension; a second chamber in fluid communication with a second orifice of the volumeter assembly conduit, the second chamber adapted to contain at least a second portion of the fluid suspension; and a current source and sensing circuit module (120, 130) in direct electrical connectivity with the first and second distal regions of the volumeter assembly, wherein the current source and sensing circuit module (120, 130) is configured to provide an electrical excitation current to the first and second distal regions to establish a particle-sensitive zone within the conduit, and wherein the current source and sensing circuit module (120, 130) is configured to detect current changes occasioned by particles of the biological sample passing through the particle-sensitive zone, wherein the conduit wall length is provided by a semiconductor wafer which is doped with an electrically active impurity to provide the central region of higher electrical resistivity disposed between the first distal region of lower electrical resistivity and the second distal region of lower electrical resistivity. a volumeter assembly having a conduit adapted to receive a fluid suspension containing the particles therethrough, the conduit defining an axial conduit wall length having a central region of higher electrical resistivity disposed between a first distal region of lower electrical resistivity and a second distal region of lower electrical resistivity; a first chamber in fluid communication with a first orifice of the volumeter assembly conduit, the first chamber adapted to contain at least a first portion of the fluid suspension; a second chamber in fluid communication with a second orifice of the volumeter assembly conduit, the second chamber adapted to contain at least a second portion of the fluid suspension; and a current source and sensing circuit module (120, 130) in direct electrical connectivity with the first and second distal regions of the volumeter assembly, wherein the current source and sensing circuit module (120, 130) is configured to provide an electrical excitation current to the first and second distal regions to establish a particle-sensitive zone within the conduit, and wherein the current source and sensing circuit module (120, 130) is configured to detect current changes occasioned by particles of the biological sample passing through the particle-sensitive zone, wherein the conduit wall length is provided by a semiconductor wafer which is doped with an electrically active impurity to provide the central region of higher electrical resistivity disposed between the first distal region of lower electrical resistivity and the second distal region of lower electrical resistivity.