A 38-year-old woman with acute promyelocytic leukemia (APL) presents with fever, bleeding, and a platelet count of 15,000/μL. Laboratory studies show PT 18 s (control 12 s), aPTT 52 s (control 35 s), fibrinogen 80 mg/dL, and D-dimer >10 μg/mL. Which finding best distinguishes DIC secondary to APL from primary fibrinolysis?

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