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Stability of coagulation factors in plasma prepared after a 24-hour room temperature hold


  • This study was supported by a grant from Pall Medical, Covina, CA.

Joseph Sweeney, MD, FACP, FRCPath, Director, Coagulation and Transfusion Medicine, The Miriam Hospital, 164 Summit Avenue, Providence, RI 02906; e-mail:


BACKGROUND: The manufacture of fresh-frozen plasma (FFP) requires that plasma be frozen within 8 hours of collection and 24-hour frozen plasma requires 1 to 6°C refrigeration before freezing. Manufacture of plasma after a room temperature hold for 24 hours, while convenient, could compromise clotting factor levels.

STUDY DESIGN AND METHODS: Pairs of FFP and 24-hour room temperature–frozen plasma (PLT-rich plasma [PRP]-24HRTFP) were manufactured from PRP after a room temperature hold for 8 and 24 hours, respectively. Additional whole blood (WB) donations were kept at room temperature for 24 hours before plasma manufacture (WB-24HRTFP). The frozen plasma products were stored at −18°C, thawed, and then stored at 1 to 6°C, with coagulation factor assays performed for up to 7 days.

RESULTS: On the day of thaw, Factor (F)VIII was lower in PRP-24HRTFP by 13% (p = 0.002) but not in WB-24HRTFP (p = 0.3) compared to FFP. All other clotting factors were within normal range. During the postthaw period FVIII and FV declined 25 and 6%, respectively, in WB-24HRTFP and 23 to 50% in the paired products; however, the difference between both types of 24HRTFP and FFP is insignificant by Day 7 (p > 0.05). Other clotting factors either were unchanged or showed minimal reduction (<15%).

CONCLUSION: Plasma manufactured after a 24-hour room temperature hold contains coagulation factors comparable to FFP except for a possible reduction of up to 20% in FVIII. This plasma appears suitable as a transfusable product and extension of liquid storage to 7 days merits consideration.