Blood coagulation time (PT) or simply its normalized ratio (INR) is expected to be between 0.8 and 1.2. Lower INR means faster clotting while higher INR means slower clotting. According to medical condition of some patients (for instance the ones with heart surgery) may require higher levels of INR. Hence frequent and regular testing is required to meet desired INR levels for patients on Warfarin (anti-coagulation drug) Therapy. Such frequent testing have a better chance to prevent;