The drainage in the chest tube of a client with emphysema has changed from viscous green to clear watery fluid. Which action is best for the nurse to take?

Rationale: A. "Milk" the tube to remove any clots: Milking the chest tube is only indicated if there is obstruction or clot formation preventing proper drainage. In this scenario, the change in fluid character does not suggest blockage, so this intervention is not appropriate. B. Maintain the current IV antibiotic schedule: Continuing antibiotics may be necessary for infection management, but the change in drainage from green viscous to clear watery fluid could indicate a new process, such as serous drainage or resolution of infection, and warrants assessment before assuming current therapy is adequate. C. Obtain a specimen of the drainage for culture: A sudden change in the appearance of chest tube drainage may indicate a shift in the type of fluid or a new infection. Sending a specimen for culture helps identify any pathogens and guides appropriate antibiotic therapy. D. Schedule a portable chest x-ray per PRN protocol: Imaging may be useful to assess lung expansion and tube placement, but it does not directly address the need to identify the cause of the altered drainage. Culture and lab analysis take priority in guiding treatment.