A client who fell at home fractured the left hip. The client has a history of atrial fibrillation and is currently taking warfarin 5 mg by mouth daily. The nurse receives a call from the laboratory regarding the client's INR value of 20. After writing down and reading back the value, which intervention should the nurse implement first?
A. Give a dose of Vitamin K intramuscular (IM) now as prescribed
B. Assess the client's oral mucosa for signs of bleeding
C. Hold the next dose of warfarin as instructed