Which product reverses the effects of anticoagulants and provides coagulation factors II, VII, IX, and X?

• A. Fresh Frozen Plasma
• B. Vitamin K
• C. Prothrombin Complex Concentrate
• D. Four-factor prothrombin complex concentrate

Answer: (D)

Warfarin and similar anticoagulants work by depleting the vitamin K–dependent clotting factors II, VII, IX, and X. Four-factor prothrombin complex concentrate provides those exact four factors in concentrated form, so it can rapidly replenish what’s reduced and quickly restore the blood’s ability to clot. This rapid correction is crucial in major bleeding or when surgery is urgent.

Vitamin K helps the body make these factors again, but its effect comes slowly, not fast enough for urgent reversal. Fresh frozen plasma can also provide the factors, but it requires transfusing larger volumes and acts more slowly than PCC. So, the product that directly and quickly supplies factors II, VII, IX, and X is the four-factor prothrombin complex concentrate.