Medicine Best assay for deficiency of von Willebamd factor is: A Bleeding time B BT + APTT C BT + APTT + vWF-ristocetin factor assay D PT 💡 Explanation Best assay for deficiency of von Willebamd factor is: ✓ Correct Answer: C. BT + APTT + vWF-ristocetin factor assay