Composition of 4-Factor Prothrombin Complex Concentrate
4-factor PCC contains therapeutic amounts of four vitamin K-dependent coagulation factors: Factor II (prothrombin), Factor VII, Factor IX, and Factor X, plus the anticoagulant proteins C and S. 1, 2, 3
Core Components
The four clotting factors (II, VII, IX, X) are obtained from pooled human plasma and concentrated to approximately 25 times the levels found in fresh frozen plasma per unit volume 2
Protein C and Protein S are included as natural anticoagulant proteins to help balance the thrombotic risk 1, 2, 3
Small amounts of heparin are added to many formulations to reduce the risk of thrombosis 4, 2
Antithrombin is present in some formulations as an additional safety measure against thrombotic complications 4, 2
Product Characteristics
The product undergoes viral inactivation and pathogen reduction processes during manufacturing, making it free of viral contaminants 2, 5
It is stored as a lyophilized (freeze-dried) powder at room temperature, allowing for rapid reconstitution at bedside in 20-30 minutes 2, 6
No ABO blood group compatibility testing is required, unlike fresh frozen plasma 2
The product is dosed based on Factor IX content, with actual potency ranging from 20-32 Factor IX units/mL after reconstitution 3
What Distinguishes 4-Factor from 3-Factor PCC
4-factor PCCs contain adequate therapeutic levels of Factor VII, while 3-factor PCCs have low or negligible Factor VII content 4, 2, 6
This distinction is clinically important because Factor VII has the shortest half-life (approximately 6 hours) of the vitamin K-dependent factors and is critical for rapid INR reversal 2
Important Clinical Context
The half-lives of the contained factors vary significantly: Factor VII (6 hours), Factor IX (20 hours), Factor X (30 hours), and Factor II (60 hours) 2
Vitamin K must always be co-administered with 4-factor PCC because the short half-life of Factor VII means the reversal effect will wear off within 12-24 hours, while warfarin's anticoagulant effect persists much longer 1, 2
Commercial products may vary slightly in their exact composition of coagulation factors, inhibitors, and the presence/amount of heparin and antithrombin 2