DESPINA CALAMAR POPOVICI, IOANA IONITA, CLAUDIU IONITA, ANDRADA MARINITA, RADU DUMITRU MOLERIU, HORTENSIA IONITA, DANIELA IACOB, VERONICA DANIELA CHIRIAC, IZABELLA PETRE STATISTICAL HIERARCHY OF DIAGNOSTIC CRITERIA FOR CHRONIC MYELOID LEUKEMIA The rational design of treatment is affected by two contradictory requirements: for diagnosis it is necessary to take into account all the factors of influence in the disease system, which requires long time and additional costs and also It is necessary to minimize the number of clinical determinations or the optimization of the medical act. A solution for eliminating this contradiction would be to reduce the number of parameters. The purpose of this study is to reduce the number of parameters by selecting factors with major influence in the course of the disease .This study began with the inventory of the diagnostic factors registered in the clinical observation sheet of 140 patients diagnosed with chronic myelogenous leukemia at the Hematology Department of Timisoara during January 2006 - January 2016. The statistical method of rank correlation used is a very effective solution of the problem, applicable in the medical field. The statistical hierarchy of the diagnostic criteria determines their ranks and allows focusing attention on the most important ones. The presented statistical study creates the theoretical and practical premises for the treatment to be differentiated, the disease to be recognized in a period as early as possible.