A nurse is teaching a client about warfarin therapy. Which of the following statements by the client indicates a need for further teaching?

The correct answer is D: "I can double my dose if I miss one." This statement indicates a need for further teaching because doubling the dose of warfarin can increase the risk of bleeding significantly. The client should never double the dose. Taking a higher dose without consulting the healthcare provider can lead to serious complications. Reporting any signs of bleeding to the provider (B) is important for monitoring and adjusting the dosage if necessary. Consistency in timing of medication (C) is crucial for maintaining therapeutic levels. Avoiding large amounts of spinach (A) is important as spinach is high in vitamin K, which can interfere with warfarin's effectiveness.