Disseminated intravascular coagulation (DIC) is best described as which of the following?

• A. Autoimmune destruction of platelets
• B. Hypercoagulable state with arterial thrombosis
• C. Platelet aggregation in veins
• D. Consumptive coagulopathy resulting in widespread activation of thrombin

Answer: (D)

DIC is a consumptive coagulopathy characterized by widespread activation of thrombin, which drives extensive fibrin formation throughout the microcirculation. This rapid thrombin generation uses up platelets and coagulation factors, so patients can develop severe bleeding even as clots form in small vessels. The underlying trigger (like sepsis, trauma, malignancy, or obstetric complications) sets off this systemic coagulation cascade, leading to both thrombosis and bleeding.

This differs from autoimmune destruction of platelets, which is immune thrombocytopenia and mainly features isolated low platelets without the massive coagulation activation. It also isn’t simply a hypercoagulable state with arterial clots, since DIC involves widespread microvascular thrombosis and, critically, a consumptive loss of clotting components causing bleeding. Platelet aggregation in veins describes venous thrombosis, not the systemic coagulopathy and consumption seen in DIC.