The nursing caring for a patient who is receiving Warfarin. The lab calls and tells the nurse the patient's INR is reported at 5.3. What action should the nurse take?

A. Continue with the current dose: An INR of 5.3 is above the therapeutic range, indicating a high risk of bleeding. Continuing the current dose without intervention could lead to serious hemorrhagic complications. Dose adjustment or reversal is necessary to ensure patient safety. B. Administer additional warfarin: Giving more warfarin would further increase anticoagulation, greatly elevating the risk of spontaneous bleeding. This action is dangerous and contraindicated when the INR is already supratherapeutic. C. Increase the dose of warfarin: Increasing the dose would exacerbate over-anticoagulation and heighten the risk of severe bleeding. The priority is to reduce the anticoagulant effect, not intensify it. D. Administer vitamin K as ordered: Vitamin K acts as an antidote to warfarin by promoting clotting factor synthesis, which lowers INR and reduces bleeding risk. Administering it under provider guidance corrects over-anticoagulation safely and prevents hemorrhagic complications.