Which parameter is commonly used to assess bleeding risk before invasive procedures, describing the threshold?

• A. Serum sodium
• B. Platelet count and coagulation tests (PT/INR, aPTT); commonly threshold >50,000
• C. Blood pressure
• D. Cholesterol

Answer: (B)

Assessing bleeding risk before invasive procedures hinges on how well the body's clotting system works. Platelets provide the initial plug to stop bleeding, so the platelet count is a key measure; too few platelets mean a higher risk of prolonged bleeding. In addition, coagulation tests examine the enzymatic cascade that strengthens the clot: PT/INR assesses the extrinsic pathway, and aPTT assesses the intrinsic pathway. Together, these tests reveal whether a coagulopathy could lead to excessive bleeding during or after a procedure. A common threshold used in practice is about 50,000 platelets per microliter for many minor procedures; counts below this increase bleeding risk and may prompt delay or correction. Serum sodium, blood pressure, and cholesterol do not directly gauge the hemostatic ability needed for procedures.