Expected INR After Stopping Warfarin for One Week

Timeline of INR Decline After Warfarin Discontinuation

An INR between 2.0 and 3.0 typically falls to the normal range within 4 to 5 days after warfarin is stopped, according to the American College of Cardiology 1
After stopping warfarin for one week, the INR would be expected to return to normal range (≤1.2) in most patients, as recommended by the American College of Cardiology and the American College of Chest Physicians 1, 2

Patients over 75 years of age may experience delayed decay of warfarin's anticoagulant effect, as reported by the American College of Chest Physicians 2, 3

When planning for procedures requiring normal hemostasis, warfarin is typically stopped 4-5 days preoperatively to allow the INR to return to normal (≤1.2), according to the American College of Cardiology 4, 5
For high-risk patients who cannot safely remain without anticoagulation, bridging therapy with heparin or LMWH may be initiated when the INR falls below the therapeutic range, as recommended by the American College of Cardiology 4, 5
For urgent reversal of anticoagulation, vitamin K1 can be administered (2.5 mg orally) to expedite INR normalization, according to the American College of Cardiology 4, 5