What is the most appropriate next step for a patient presenting with hemoptysis and normal vital signs?

In the context of a patient presenting with hemoptysis, the most appropriate next step is to obtain a chest X-ray. This initial imaging study is crucial because it allows for a quick assessment of the lungs and thoracic structures to identify any obvious sources of bleeding, such as pneumonia, lung masses, or other abnormalities. Given that the patient has normal vital signs, they are likely stable, which makes it appropriate to start with a non-invasive diagnostic approach.

A chest X-ray can help determine whether there is a structural issue or infection that might be causing the hemoptysis, guiding further management. If the X-ray is normal but hemoptysis continues or worsens, further investigations, like a CT scan or bronchoscopy, might be warranted depending on the clinical context. However, starting with a chest X-ray is a standard and logical approach in this scenario, providing valuable information efficiently and safely.