Which of the following tests is commonly used to assess a patient suspected of having Acute Respiratory Distress Syndrome?

Chest X-ray is the commonly used test to assess a patient suspected of having Acute Respiratory Distress Syndrome (ARDS). In cases of ARDS, chest X-rays typically reveal bilateral infiltrates that suggest fluid accumulation in the lungs. This imaging technique helps to rule out other conditions that could lead to similar respiratory symptoms and provides insight into the extent of lung involvement.

While other imaging studies, such as a CT scan, can provide more detailed visualizations of lung pathology, they are not routinely used as the first-line diagnostic tool in this scenario. Similarly, a treadmill test evaluates cardiovascular fitness and is not applicable in diagnosing ARDS. An electrocardiogram is used to assess heart function rather than lung conditions, making it irrelevant for diagnosing ARDS. Therefore, a Chest X-ray is the most appropriate initial diagnostic test for evaluating potential cases of Acute Respiratory Distress Syndrome.