[Flow cytometry in hematologic diagnosis]. 
The paper presents flow cytometry method in haematology diagnostics.  Beside to the estimation of blast cells phenotype in acute leukaemia, flow cytometry allows to evaluate the presence of minimal residual disease (MRD) and multi drug resistance protein (MDR).  Flow cytometry plays a crucial role in the estimation of DNA profile in cancer cells and evaluation of stem cells.  Repeatedly flow cytometry is used to estimate platelets and reticulocytes.