A client is receiving IV heparin and oral warfarin after a pulmonary embolism (PE). The nurse determines the client's activated partial prothromboplastin time (APTT) value is two times the control value; the prothrombin time (PT) level is the same as the control, and the international normalized ratio (INR) is 1. Which protocol prescription should the nurse implement? Reference Range: Activated Partial Prothromboplastin Time (APTT) [Anticoagulant therapy: 1.5 to 2 times the control value in seconds.] Prothromboplastin Time (PT) [Anticoagulant therapy: greater than 1.5 to 2 times the control value.] International Normalized Ratio (INR) [0.8 to 1.1]