For a patient with fever, crackles throughout the lungs, and edema, which diagnostic procedure should the nurse prepare to do first?

• A. Sputum culture
• B. Chest X-ray
• C. Blood culture
• D. Urinalysis

Answer: (C)

When a patient presents with fever and signs of lung involvement (crackles) plus edema, the first step is to visualize the lungs and heart to identify the underlying problem. A chest X-ray quickly shows whether there are infiltrates suggestive of pneumonia, diffuse edema from heart failure, or other abnormalities, and can also reveal heart size and possible effusions. This imaging guides immediate treatment decisions, such as starting antibiotics for pneumonia or managing fluid overload and cardiac function for edema.

Blood cultures become important if sepsis or bacteremia is suspected, but they don’t provide the rapid, clarifying view of the lungs that imaging offers and aren’t the initial test to diagnose the cause of pulmonary findings. Sputum culture can help identify a causative organism but requires a specimen and time, whereas imaging informs the initial clinical plan. Urinalysis isn’t helpful for evaluating lung symptoms or edema.

So, obtaining a chest X-ray first gives the most immediate, actionable information about the lung and heart status in this scenario.