A nurse is teaching a client who takes warfarin daily. Which of the following statements by the client indicates a need for further teaching?

A. "I eat a green salad every night with dinner." – While green leafy vegetables contain vitamin K, which can affect warfarin, consistent intake is acceptable. The key is to avoid sudden changes in vitamin K consumption. B. "I take this medication at the same time each day." – This is correct practice. Taking warfarin at the same time daily helps maintain a stable INR. C. "I had my INR checked three weeks ago." – While INRs should be checked regularly, especially when dosing changes or risks arise, a three-week interval may be acceptable if the INR has been stable. D. "I have started taking ginger root to treat my joint stiffness." – (Needs further teaching). Ginger root can increase the risk of bleeding when taken with warfarin due to its antiplatelet effects. Clients should be instructed to avoid herbal supplements that may interact with warfarin unless approved by their provider.