For more than ten years, cytometers, based on electric resistance mothod , has been widely used in most clinical laboratories due to the advantages of simple operation, time- saving procedures and good reproducibility. However, during the measuring of cell count some parameters of cytometer are influenced by many factors,one of which is erythocyte de- formability. The authors probe into the impact of erythocyte deformability on the mean cell volume (MCV)and other parameters when using electri...