ABSTRACT
BACKGROUND: Fresh frozen plasma (FFP) is used to treat coagulation disorders. Even though the activity of labile coagulation factors gradually decreases once thawed, it can be used up to 24 h after thawing, if stored properly. In this study, the level of coagulation factor activity was evaluated in thawed plasma during a 5 day storage period. MATERIALS AND METHODS: This cross-sectional study was performed on 40 FFP units prepared in Yazd Blood Center. Samples were thawed in a waterbath for 20-30 min at 30-37°C and then stored in the hospital blood bank refrigerator. The level of fibrinogen concentration, as a stable factor and, coagulation factors V and VIII, as labile factors, were measured in the plasma immediately following the thawing process as well as 24 and 120 h after the process. Data analysis was performed using SPSS software 20. RESULTS: The fibrinogen level remained stable for up to 24 h after thawing; after 120 h there was a 1.66% decrease with the mean level of 334.0 ± 53.3 mg/dl. The mean activity of factors V and VIII levels decreased by 12.3%, and 26% respectively over 120 h after thawing when compared to that after 24 h. A 120 h after thawing Factor V activity was above 70% in 87.5% of thawed plasmas and its mean activity was 81.6 ± 11.8. Factor VIII activity was above 70% in only 35% of thawed plasmas with the mean activity of 64.4 ± 17.2. CONCLUSION: Thawed plasma can be used for up to 5 days in all therapeutic applications of FFP since it still has the essential hemostatic effects. However, in situations where higher levels of FVIII are needed, Thawed Plasma is not a suitable alternative. In such cases FFP, FVIII concentrate or cryoprecipitated antihemophilic factor should be used.
