You Are Called to Attend to an ER Patient Complaining

You are called to attend to an ER patient complaining of shortness of breath and severe dyspnea on exertion. Patient history is significant for a 30-year-pack smoking history, dry nonproductive cough, and occasional pedal edema. CXR findings are not remarkable except for mild cardiomegaly. You want to rule out ILD versus obstructive lung disease. Which of the following tests may help you to differentiate the diagnosis on this patient?
1) Sputum culture and sensitivity
2) High-resolution CT
3) Pulmonary function testing
4) Arterial blood gas analysis

A) 2, 3, and 4 only
B) 1, 3, and 4 only
C) 1 and 4 only
D) 3 and 4 only

Correct Answer:

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