a 42 year-old female who smokes 1 pack of cigarettes a day presents with acute onset of shortness of breath and pleuritic chest pain for the past 3 hours. her medications include ortho tricyclen for birth control. ct angiogram shows a clot in the anterior segmental artery in the left lung. the patient is treated with unfractionated heparin. what should be included in the laboratory orders of this patient to monitor the heparin dosing and ensure the therapeutic goal?