What lab test is primarily monitored for patients on warfarin?

The primary lab test monitored for patients on warfarin is the PT/INR. Warfarin works as an anticoagulant by inhibiting certain clotting factors in the coagulation cascade, which is monitored through prothrombin time (PT). The International Normalized Ratio (INR) is a standardized measure derived from the PT, which helps in assessing and maintaining the therapeutic range for anticoagulation. It is crucial to monitor the INR closely, as it indicates how well the warfarin therapy is working and helps to minimize the risk of bleeding or thromboembolic events.

Monitoring PT/INR allows healthcare providers to adjust warfarin dosages based on the patient's individual needs. Maintaining the INR within the target range significantly helps in preventing complications associated with too much or too little anticoagulation. Therefore, understanding the importance of PT/INR testing is essential for safe and effective management of patients on warfarin therapy.