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Storing platelets conventionally then switching to cold storage near expiry maintains quality. This delayed-cold storage method offers a viable strategy to extend platelet shelf life and maximize inventory for critical bleeding events.

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Area of Science:

  • Transfusion Medicine
  • Hematology
  • Blood Product Storage

Background:

  • Conventional room temperature (RT) platelet storage has limitations.
  • Cold-stored platelets exhibit rapid clearance, impacting prophylactic transfusion efficacy.
  • Platelet wastage is a significant concern in blood banking.

Purpose of the Study:

  • To evaluate the feasibility of a delayed-cold storage strategy for platelets.
  • To compare the in vitro quality of delayed-cold stored platelets with continuously cold-stored platelets.
  • To assess the potential of this method for extending platelet shelf life and optimizing inventory.

Main Methods:

  • Matched pairs of buffy-coat-derived platelets were used (n=8).
  • One unit underwent continuous cold storage (2-6°C).
  • The second unit (delayed-cold) was stored at RT (20-24°C) for 4 days, then transferred to cold storage (2-6°C). In vitro quality was assessed over 21 days.

Main Results:

  • Both storage methods maintained similar platelet counts.
  • Delayed-cold platelets showed significantly higher pH and HSR but comparable metabolic markers.
  • Platelet activation markers (phosphatidylserine, CD62P) and microparticle release were similar between groups.
  • Aggregation responses in delayed-cold platelets mirrored those of cold-stored platelets after transfer.

Conclusions:

  • Delayed-cold storage results in comparable metabolic and activation profiles to continuous cold storage.
  • Transferring platelets to refrigerated storage near expiry is a viable strategy.
  • This approach can potentially maximize platelet inventories for transfusion services.