Background-Platelet storage adversely affects platelet structure and function in vitro, and is associated with decreased platelet recovery and function in vivo. In pediatric transfusion medicine, it is not uncommon for small residual volumes to remain in parent units following aliquot preparation of leukoreduced apheresis-derived platelets (LR-ADP). However, limited data exists regarding the impact of storage on residual small volume LR-ADP.