In disseminated intravascular coagulation (DIC), which laboratory pattern distinguishes acute (decompensated) DIC from chronic (compensated) DIC, such as that seen in giant hemangioma (Kasabach-Merritt phenomenon)?

• A Acute DIC: PT/APTT normal with isolated thrombocytopenia; Chronic DIC: thrombocytopenia with markedly elevated fibrinogen
• B Acute and chronic DIC are indistinguishable on routine coagulation studies; only TEG/ROTEM differentiates them
• C Acute DIC: PT/APTT prolonged, fibrinogen low, platelets low, D-dimer elevated; Chronic DIC: PT/APTT near-normal, fibrinogen normal/high (consumption compensated by liver synthesis), platelets low, D-dimer elevated ✓
• D Chronic DIC shows prolonged bleeding time but normal platelet count; acute DIC shows normal bleeding time with platelet consumption

Explanation

In acute/decompensated DIC, massive thrombin generation overwhelms all protective mechanisms — fibrinogen is rapidly consumed (low), clotting factors are depleted (PT/APTT prolonged), platelets are consumed (low), and D-dimer (fibrin degradation products) is markedly elevated. In chronic/compensated DIC (as in giant hemangioma, carcinoma, or aortic aneurysm), the slow ongoing activation is compensated by increased hepatic synthesis of fibrinogen (which is an acute-phase protein, often elevated) and increased thrombopoiesis; the dominant finding is thrombocytopenia with elevated D-dimer while coagulation times may be near-normal.

Reference: Robbins & Cotran Pathologic Basis of Disease, 10th ed.

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