What is the primary purpose of Buccal Mucosal Bleeding Time?

• A. Evaluates platelet function
• B. Both evaluates platelet function and screens for von Willebrand's disease
• C. Screens for von Willebrand's disease
• D. Measures bleeding time only

Answer: (B)

Buccal Mucosal Bleeding Time measures how long bleeding lasts after a standardized mucosal incision, reflecting primary hemostasis and platelet function. The test is sensitive to how well platelets adhere and aggregate at a wound site, which relies on von Willebrand factor. If platelet function is defective or von Willebrand factor is deficient or dysfunctional, the bleeding time is prolonged. That combination—assessing platelet function and screening for von Willebrand disease—explains why this test is used for both purposes, not merely as a generic measure of bleeding time. It’s not limited to a single use because it provides information about both platelet function and potential vWD.