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History of allo- or autoantibodies, TCD velocity, and erythrocytapheresis use were not significant predictors of a pretransfusion HbS http://www.selleckchem.com/products/XL184.html transfusions. In the STOP2 study, where children with abnormal TCD velocities whose Doppler readings became normal were randomly assigned to continue or stop transfusions, 24% of the patients had pretransfusion HbS levels greater than 30% [9]. These findings indicate that even in the context of a prospective clinical trial, maintaining HbS http://www.selleck.cn/products/MLN8237.html with SCA who are at risk for primary stroke with transfusions to maintain HbS http://www.selleckchem.com/products/CP-690550.html of chronic transfusion therapy on TCD velocities, the pretransfusion HbS levels for 88 children who were identified to have abnormal TCD velocities during screening for STOP2 was noted to be 37 �� 20% [10]. A single institution retrospective study from France involving 17 children with SCA with abnormal TCD velocities reported mean pretransfusion HbS levels were 30 �� 10% during chronic transfusion therapy, but with a follow-up period of only 39 patient-years [11]. We have conducted a similar survey analyzing chronic transfusion practice for 295 children with SCA and previous stroke at 23 US institutions [6]. Results of that study were very similar to the current study including an average pretransfusion %HbS of 35 �� 11%. Receiving scheduled transfusions on time was identified as the most significant factor to maintain HbS at ��30%. Finally, in a prospective cohort study, the mean pretransfusion %HbS values of 39 children with SCA and stroke followed at seven academic centers was 26.9% (range, 3.94�C48.3%) [12].