A patient taking warfarin requires dental treatment. Which test monitors their anticoagulation?

The INR (International Normalized Ratio) standardizes the prothrombin time (PT) and is the standard test for monitoring warfarin therapy. Target INR for most patients is 2–3. Before invasive dental procedures, INR should ideally be <3.5. CBC doesn't measure coagulation. aPTT monitors heparin, not warfarin.