A 28-yeаr-оld pаtient with nо chrоnic heаlth problems reports moderately severe retrosternal chest pain, which worsens with breathing and lying down. Symptoms improve with sitting up and leaning forward. Symptoms starting rather abruptly one day ago. Pain was preceded by several days of a low-grade fever. Patients has no risks of VTE, such as recent immobility or injury. Vital signs show an oxygenation saturation of 98% on room air, a blood pressure of 144/88, HR of 74, and a respiratory rate of 16. What action by the NP is most appropriate?