Platelets are an important component of blood. Transfusions with platelets help to control bleeding in thrombocytopenic patients. Using the standard blood banking procedures, platelets can only be stored for up to 5 days. This is to help decrease the risk of contamination with bacteria. Currently, it is not possible to use cryopreserved (frozen) platelets because the platelets are damaged during the freezing process. Therefore, long-term banking of platelets or autologous donation (storing your own platelets to be given back to you at a later time) has not been possible. ThromboSol is a new solution that was designed to allow platelets to be frozen without damaging them. The use of ThromboSol may allow for long-term banking of platelets and/or autologous donations.