Background: During the plateletpheresis procedure the number of thrombocytes in the donor’s blood significantly decreases, and the levels of the hematocrit, hemoglobin, and leukocyte diminish as well. Influence of the cell separator is one of the factors that affects the levels of HCT, Hgb and WBC. Objective: In this study, the goal was to determine the value difference of HCT, Hgb, WBC, and platelets after the platelet pheresis process between performance on Fenwal AMICUS and on COBE Spectra LRS Methods: The criteria for participation: male in the age range of 25-45. We have formed two groups: group I–180 separation were performed on 60 participants were the values of hematocrits, concentration of hemoglobin and number of leukocytes ware established before and after separation using the single-needle intermitent flow cell separation (SN-IFCS) on the Fenwal AMICUS device. Group II – presented 180 separation that were performed on 60 participants, were the values of hematocrits, concentration of hemoglobin and number of leukocytes ware established before and after separation using double-needle continuous flow cell separation (SN-IFCS) on the COBE Spectra LRS. device. To confirm the statistical differences we have used Student t-test for independent or dependent samples, as well as Mann-Whitney U test as non-parametric alternative. To compare differences between the values of four parameters (P1-P2) from two groups (using two devices–Fenwal AMICUS and Fresenius Com Tec) we have performed the ANOVA variance analyze. The possibility of errors were accepted for α<0,05, and the difference between groups as statistical relevant were accepted for p<0,05. Results Statistically significant lower values were noted for all researched parameters after separation on both devices (Fenwal AMICUS and COBE Spectra LRS). Comparing the parameters of hematocrit, leukocytes and hemoglobin’s, we found a statistical significant difference in the decrease of the parameter’s value after separation, there was a significant decrease change in using COBE Spectra LRS cell separator compared to using Fenwal AMICUS cell separator with the same procedure. For the platelets (Plt) there was no statistical significant difference (p> 0,05-α=0,05), between average level obtained using either Fenwal AMICUS or COBE Spectra LRS. Conclusion: The type of cell separator had the influence on the decrease value of the observed parameters.

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CONFLICT OF INTEREST: NONE DECLARED Introduction The collection of platelets by apheresis is considered as a very great progress in transfusion medicine. A larger yield (total number of collected platelets) is obtained if the donor has a greater number of initial platelets and if the separation is done in a shorter time. One of the parameters is also the efficiency of the platelet collection (expressed in percentage) on the value of which different factors may have direct or indirect influence. Aims To calculate the efficiency of platelet collection with the separator Fenval Baxter AMICUS and to compare the efficiency of platelet collection with this separator in relation to the initial value of donor hematocrit. Donors and Methods The donors who participated in this study were divided into groups according to the value of the donor’s ‘hematocrit before separation. Group C consisted of donors whose initial value of the hematocrit was lower or equal to 46%. Group D consisted of donors whose initial value of the hematocrit was higher than 46%. The process was carried out on Fenval Baxter AMICUS. The expected efficiency of the collection was obtained by dividing the total number of collected cells by the expected total number of processed cells, i.e. the total number of cells passed through the equipment. Results In the 258 separations which satisfied the fixed criteria were men in 226 cases (87.6%) and women in 32 (12.4%). There is a statically significant difference in the platelet value between the groups and this value is higher in group D than in group C. The average value of platelets before separation was 46.66. The range of minimal and maximal value is from 38.8 to 52.4 ±2.78. The initial value of hematocrits of the donor does not intervene in the length of the separation, but it has a significant effect on the efficiency of the platelet collection. Increases in the number of hematocrits significantly decrease the efficiency of platelet collection. In practice it means that we can base on this fact make a better selection of donors. In this kind selection, one should prefer a donor with a higher number of initial platelets and lower levels of hematocrits. In that way we can collect a more important yield, have a shorter length of separation and increase the efficiency of platelet collection. Its advantage is as well medical because of a more important yield but also financial because of the decrease of the length of the separation and the increase in efficiency. Key words: value of hematocrits, donors, apheresis, platelets, efficiency.