Prothrombin Time and International Normalized Ratio (Partial Thromboplastin Time (PTT)
Why Get Tested?
To check how well the blood-thinning medication (anticoagulant) warfarin (COUMADIN®) is working to prevent blood clots; to help detect and diagnose a bleeding disorder
When to Get Tested?
When you are taking warfarin or when your doctor suspects that you may have a bleeding disorder.