The article presents in formation about the in virto technique to predict in vivo behavior of transfused, stored platelets. The storage of platelet concentrates (PCs) is restricted to 5 days because of the danger of bacterial contamination. Pathogen inactivation of PCs, or testing them for bacterial contamination, may be implemented in the future. It will then become possible to increase the storage time from 5 to 7 days. The information was obtained by sending questions to the experts in the field.