Which of the following clump and adhere to the wall of the injured blood vessel to begin the process of hemostasis?

1. White Blood Cell Count (WBC): WBCs are part of the immune system and play a role in fighting infections. However, they are not directly involved in hemostasis or clot formation. WBCs do not adhere to the vessel wall during hemostasis.
2. Activated Partial Thromboplastin Time (aPTT): aPTT measures the time it takes for blood to clot. It is primarily used to monitor heparin therapy, not warfarin. aPTT is not specific for warfarin monitoring.
3. Prothrombin Time (PT): PT measures how quickly blood clots. It is used to monitor warfarin therapy and assess clotting factors. PT is essential for monitoring warfarin effectiveness.
4. Platelet Count: Platelets are crucial for clot formation. Platelet count helps assess platelet function. Platelets play a direct role in hemostasis.

A. Easy bruising indicates the medication is effective: While some bruising is possible, excessive bruising doesn't necessarily mean the medication is working effectively. It could indicate excessive anticoagulation, requiring dose adjustments.

B. Inject the medication deep into the thigh muscle: Heparin is injected subcutaneously, targeting the fatty tissue layer just beneath the skin. Injecting into the muscle can be painful and decrease absorption.

C. Expect stools to become black and tarry: Black stools can be a sign of upper gastrointestinal bleeding, a potential but uncommon side effect. The nurse should instruct the client to report any black stools but not expect them as a normal occurrence.

D. Use a soft bristle toothbrush: This is important because heparin increases bleeding risk, and a soft-bristled toothbrush minimizes gum irritation and potential bleeding.