Which blood product must be separated and frozen within 8 hours to maintain all coagulation factors in normal concentrations?

• A. Platelet concentrate
• B. Cryoprecipitate
• C. Frozen fresh plasma
• D. Whole blood

Answer: (C)

Fresh frozen plasma is used to preserve the full set of coagulation factors. After collection, plasma must be separated from the cells and frozen quickly, typically within eight hours, because many clotting factors are labile and lose activity if not promptly preserved by freezing. Keeping plasma frozen within that window maintains normal factor concentrations for effective coagulation support. Platelet concentrates aren’t frozen and must be stored at cooler, non-freezing temperatures to keep platelets viable. Cryoprecipitate is made from thawed plasma and concentrates specific factors like fibrinogen and factor VIII, not the entire coagulation factor spectrum, so it isn’t the product defined by eight-hour freezing to preserve all factors. Whole blood is usually separated into components rather than kept as a single frozen product, so the eight-hour freezing requirement applies to the plasma portion specifically.