The present prospective study was carried out in the department of transfusion medicine Forties Escorts Heart Institute, New Delhi from Sep. 2011 to Feb 2012.the study was carried out with the aim to evaluate the effect of automated donation by fresenius.com.tec on the haematological values (HB, PLT count, WBC count, PDW,MPV) pre and post donation and to further evaluate the efficiency of platelet collection by fresenius.com.tec in terms of processing time, platelet yield, type of procedure(SN and DN)and ACD used. A total of 240 donors were subjected for apheresis out of these 229 are male donor and 11 were the female donors and 71 donors were subjected to the donation by SN procedure and 169 underwent donation by DN procedure. Majority of the donor (87%) was between the age group 18-40 years very few donors were (13%) observed between the age group of 41-60 years of age. Total of 240 donors were subjected for apheresis out of them 229 male (95%) donor and very few (5%) are the female donors. A total of 240 donors were subjected for apheresis out of them 71 underwent SN apheresis and 169 were subjected DN apheresis procedure. Majority of the donor (70.42%) underwent DN procedure. The majority of the donors were male in DN (99.41%) and in SN (85.92%) the female donor population was an (0.59%) in DN procedure and ( 14.08%) in SN procedure as inferred from above data the majority of donor for PHPL were male the percentage of female donor were a little more in SN procedure (14.08%) as compared to DN procedure. The mean platelet count before apheresis was 246 lac/ɥL with the range of 144-478 lac/ɥL and the mean platelet count after apheresis 172 lac/ɥL with the range of 53-367 lac/ɥL. The mean value of platelet count dropped significantly in post-donation. Similarly the mean Hb level before apheresis was 15 g/dl with the range of 12.5-20.9 g/dl and after apheresis 14 g/dl with the range of 10.2-19.5 g/dl the mean value of Hb dropped marginally in post-donation and the mean WBC count before the apheresis is 8 X 10³ /mm³ with the range of 3.9-15.1 X 10³ /mm³ and after apheresis it is 7 X 10³ /mm³ with the range of 3.8-15 X 10³ /mm³. There was no change in PDW and MPV before and after the apheresis. In SN procedure the mean platelet count pre-donation was 241.52 lac/ɥL with a range of 152-478 lac/ɥL the mean platelet count post donation was 169.59 lac/ɥL with a range 71-335 lac/ɥL the mean platelet count in DN procedure pre-donation was 247.88 lac/ɥL with range of 144-448 lac/ɥL and post-donation 173.50 lac/ɥL with range of 53-367 lac/ɥL the mean platelet count dropped significantly following apheresis procedure the mean platelet count between either of the procedure was not significantly different. In SN procedure the mean Hb pre-donation was 14.67 g/dl with range of 12.5-18.4 g/dl the mean Hb post donation was 14.7 with range of 10.2 - 18.2 g/dl the mean Hb in DN procedure pre-donation was 15.6 g/dl with range of 12.5 - 20.9 g/dl and in post donation was 14.6 g/dl with range of 12 - 19.5 g/dl the mean Hb dropped significantly following apheresis procedure the mean Hb level in either of procedure was not significantly different. After each procedure, there was no change in WBC count, PDW and MPV. Meantime taken in the procedure performed by SN was 86.48 min and in DN procedure it was 69.12 min. The product yield in SN was 3.10lac/ɥL and in DN it was 3.13 lac/ɥL and the difference of final product count is 8.85 lac/ɥL in SN and 8.95 lac/ɥL in DN according to mean values. The product yield, final product count, and time taken by DN procedure were comparatively better than with SN procedure. The volume of ACD used varied from one procedure to another in the procedure performed on fresenius.com.tec it ranged from 220ml to 460ml with the mean of 306 ml. The volume of mean ACD used by SN procedure was 324.87 ml with a range of 210 - 460 ml. The mean ACD volume used in DN procedure was 297.75 ml with a range of (210 - 410ml). The mean ACD volume used was lesser in DN procedure when compared to the SN procedure. The comparison of overall pre-donation means platelet count with mean platelet yield was carried out and student t-test was applied to ascertain the significance of value the p-value of 0.060 was not significant. The overall mean value of various parameter of the present study were analysed and to ascertain the significance of the value the student t-test was applied and out of all the parameter the time taken in the procedure was found to be significant p-value was <0.000 and ACD volume used was also found to be significant were p-value is <0.001. During a total span of six months of study period donation was performed on 240 donors and 35 were temporarily deferred and 09 were permanently deferred for various reasons and the most common cause for donor defer for donation in present study was platelet count below 1.5 lac/ɥL (10 deferred), Hb value below 12.5g/dl. On critical analysis of data following facts emerged:- 1. On critical analysis of data that apheresis donor with low normal pre-procedure platelet count 150 – 200 X 10⁹ /L and Hb concentrate 12.5-13 g/dl should be examined for post-donation drops in these haematological parameters. 2. The donor with significant decrements should be reviewed to screen them from a future donor so to avoid iatrogenic anemia and thrombocytopenia. 3. A comprehensive prospective study on this aspect is required to establish the guidelines for donor safety in apheresis and also in assessing donor suitability. Especially with the double product apheresis collection. 4. This information can be a value an establishing post donation range which could be utilised when reviewing the suitability of donors for subsequent donation. 5. Haematological parameters should be monitored carefully in donor when are undergo long-term regular apheresis.