A nurse is caring for a client prescribed warfarin for a his…

A nurse is caring for a client prescribed warfarin for a history of deep vein thrombosis (DVT). The lab results are available for viewing. Based on the lab results, the nurse plans to implement which nursing action first? Lab Result Potassium 3.5 mEq/L Hemoglobin 9 g/dL Hematocrit 29% International Ratio 6