Elevated D-dimer with prolonged PT and aPTT suggests?

• A. A consumptive coagulopathy such as DIC or massive thrombosis with consumption of coagulation factors
• B. Isolated liver disease
• C. Inherited bleeding disorder
• D. Vitamin K deficiency

Answer: (A)

Active clot formation with simultaneous fibrinolysis drives this pattern. D-dimer is a product of crosslinked fibrin breakdown, so it rises when clots are being formed and destroyed. Prolonged PT and aPTT indicate a depletion or inhibition of clotting factors, which occurs in a consumptive process like disseminated intravascular coagulation (DIC) or in massive thrombosis where factors are consumed faster than they’re produced. So the combination points to a consumptive coagulopathy.

Liver disease can prolong PT and aPTT because factor production drops, but D-dimer is not typically elevated unless there’s an accompanying thrombosis. Inherited bleeding disorders and vitamin K deficiency affect clotting times in ways that don’t usually produce a high D-dimer.