Cryopreservation of Platelets Simplified: A Modified Glycerol‐Glucose Method

Abstract
Human platelets were prepared for freezing in liquid N by prediluting with 1 ml glycerol-glucose freezing solution, allowing the platelet concentrate to set for 10 min at 29.degree. C, and then adding an additional 8 ml at glycerol-glucose freezing solution. A 3-mm thick cardboard holder was constructed and used to hold the platelet concentration during immersion and storage in liquid N. The mean recovery of frozen thawed platelets was 79%. EM examination of the frozen thawed platelets showed the platelets to be structurally intact. In vitro testing showed the platelets to be functional.