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A 70-year-old gentleman presents to your ED with pleuritic chest pain and dyspnea. His vital signs are: HR 110, BP 140/90, SpO2 94% on RA, RR 22, T 37. His right leg is swollen compared to his left. He denies any hemoptysis, any recent surgery or immobilization, any history of malignancy or previous venous thromboembolic disease. What is your next step?