Von Willebrand factor serves as a stabilizer for which of the following?

Von Willebrand factor serves as a stabilizer for which of the following?

• A. Platelets
• B. Factor IX
• C. Ristocetin
• D. Factor VIII

Answer: (D)

Von Willebrand factor stabilizes Factor VIII in the bloodstream by binding to it, forming a complex that protects FVIII from proteolytic degradation and lengthens its circulating half-life. This keeps FVIII available to participate in the intrinsic pathway when a coagulation trigger occurs, facilitating proper thrombin generation. While VWF also helps platelets adhere to damaged endothelium, that adhesive role is separate from stabilizing FVIII. Factor IX and agents like ristocetin are not stabilized by VWF, so the best match is Factor VIII.

Von Willebrand factor stabilizes Factor VIII in the bloodstream by binding to it, forming a complex that protects FVIII from proteolytic degradation and lengthens its circulating half-life. This keeps FVIII available to participate in the intrinsic pathway when a coagulation trigger occurs, facilitating proper thrombin generation. While VWF also helps platelets adhere to damaged endothelium, that adhesive role is separate from stabilizing FVIII. Factor IX and agents like ristocetin are not stabilized by VWF, so the best match is Factor VIII.