“…Different criteria have been used by different in vestigators in evaluating the influence of storage time, preservation solution and different containers. After some initial reports [9,13,37,43] claiming the superiority of plastic or siliconed glass containers more critical investigations have been published [5,19,20,21,26,31]. Kissmeyer-Nielsen [20] in a comparative study of the effects on thrombocytes in contact with untreated and siliconed glass and plastics found no essential differences between these materials after different periods of storage.…”