A nurse is providing medication teaching to a client who has been prescribed warfarin. Which statement should the nurse include in the teaching?

A. While a cane might be used if a client has preexisting mobility issues, warfarin therapy does not inherently cause gait instability or ataxia. The medication focuses on the coagulation cascade and does not affect the musculoskeletal or neurological systems responsible for balance. The nurse should focus the teaching on the pharmacological risks of the drug rather than general mobility assistance unless a specific deficit exists. B. Warfarin is an anticoagulant prescribed specifically to decrease the risk of thromboembolic events by inhibiting vitamin K-dependent clotting factors. Telling a client they have a greater risk for blood clots while on this medication is factually incorrect and would cause unnecessary anxiety. The nurse must explain that the medication is intended to "thin" the blood and prevent the formation of dangerous clots in the heart or lungs. C. Seeking immediate medical care after a head injury is vital because warfarin significantly increases the risk of intracranial hemorrhage even with minor trauma. Because the medication prolongs the time it takes for blood to clot, a small internal bleed can quickly expand and become life-threatening. The nurse must ensure the client understands that any significant impact requires professional evaluation to rule out occult bleeding. D. Frequent testing is required for warfarin therapy, but the correct laboratory value to monitor is the Prothrombin Time (PT) and International Normalized Ratio (INR). Partial Thromboplastin Time (PTT) is used to monitor heparin therapy, not warfarin. Providing the incorrect lab name would lead to confusion and potentially dangerous errors in the client's self-management of their anticoagulant therapy and clinic visits.