【Objective】 To study the changes of blood coagulation function of donors before and after peripheral blood stem cell(PBSC)mobilization and collection, so as to evaluate the safety of the current scheme. 【Methods】 30 donors who received PBSC mobilization and collection in Zhujiang Hospital from October 2018 to October 2020 were enrolled. After mobilization by G-CSF, the correlation between coagulation function, blood routine indexes and TEG indexes of donors was analyzed, and the influence of PBSC mobilization and collection on coagulation function of donors was evaluated. 【Results】 The TEG indexes R(min), K(min), α(°), MA(mm) and CI before and after PBSC collection were 6.12±1.18 vs 7.25±2.16, 1.98±0.41 vs 2.45±0.64, 62.82±4.98 vs 57.3±6.67, 60.93±3.26 vs 55.37±4.41, and -0.31±1.40 vs -2.32±2.18, respectively(P<0.05), suggesting that there was no risk of hypercoagulability after PBSC mobilization and collection. The peak values of WBC (×10⁹/L), Plt (×10⁹/L) and Hb (g/L) were 62.02, 357 and 162, respectively, which indicated that the blood routine indexes after PBSC mobilization and collection were in the safe range. After PBSC collection, the CI value of 26.7% (8/30) donors was less than -3, showing hypocoagulability. 【Conclusion】 The current mobilization and collection scheme of PBSC has little effect on the coagulation function. Most of the donors had no risk of hypercoagulability, but a few showed a trend of hypocoagulability after PBSC collection.

【Objective】 To explore the effects of blood routine parameters on the peripheral blood hematopoietic stem cell collection of healthy donors, and predict collection timing based on these parameters. 【Methods】 The blood routine parameters pre-donation and the total number of mononuclear cells post-donation of 249 donors who applied blood cell separator to collect peripheral blood hematopoietic stem cells in our hospital from January 2018 to August 2020 were collected. Taking total nucleated cells of circulating blood per litre as the main evaluation index, and its collection with blood routine parameters pre-collection was analyzed. The relevant influencing factors were analyzed using multiple linear regression analysis. The blood routine parameters of healthy donors who donated peripheral blood hematopoietic stem cells in our hospital from September 2020 to October 2020 were substituted into the equation to obtain the predicted values, which were then compared with the actual values obtained from actual product using t test for verification. 【Results】 The analysis showed that the parameters of Hb, RBC, Hct, leukocyte count, neutrophil, lymphocyte, monocyte and Plt were statistically correlated with the total number of mononuclear cells of circulating blood per liter volume (P<0.05). There was a linear relationship between lymphocyte, monocyte, Plt and leukocyte count and the total number of mononuclear cells of circulating blood per liter. The total number of mononuclear cells of circulating blood per liter was set to (Y), and the variables such as lymphocyte (X1), monocyte (X2), Plt (X3), leukocyte count (X), and neutrophil were used as dependent variables for multiple linear regression, and the equation was: Y=9.814+ 3.131X1+ 1.666X2+ 0.020X3+ 0.124X4. There was no statistical difference between the predicted value and the calculated value (P>0.05). 【Conclusion】 The blood routine parameters of lymphocyte, monocyte, platelet count and leukocyte count of donors before collection can effectively predict the collection efficiency, therefore help predict the collection time.

【Objective】 To analyze the characteristics of peripheral blood mononuclear cells (PBMC) collection in healthy children, and explore the factors affecting collection efficiency (CE). 【Methods】 The PBMC data, involving 70 episodes of apheresis from 42 children during January 2017 and June 2020 were retrospectively analyzed All children were collected in Zhujiang Hospital of Southern Medical University. 【Results】 Multiple linear regression analysis showed that mononuclear cells (MNC) in donor collections from healthy children were positively correlated with anticoagulant dosage, lymphocyte count and monocyte count (P<0.05), meanwhile, negatively correlated with age and platelet count. The PBMC CE was negatively correlated with age, platelet count, and processed whole blood volume (P<0.05). CD34⁺ cells (×10⁷ /kg)was negatively correlated with age, meanwhile, positively correlated with numbers of collection and processed whole blood volume(r=-0.79). No statistical differences in red blood cell count, platelet count, lymphocyte count, monocyte count of healthy child donors were notable before versus after apheresis. 【Conclusion】 MNC can be collected effectively in children of different ages. The PBMC collection efficiency was related to age. Meanwhile, the higher the lymphocytes and monocytes were before apheresis, the more MNC were collected. The efficiency of MNC collection would decrease when the apheresis volume of the children exceeded their total blood volume twice. However, the absolute value of CD34+ cells in the final yields would increase.