A nurse is caring for a client who has a closed wound drainage system. Which of the following interventions should the nurse perform to assess the amount of drainage?

Choice A reason: Marking drainage output every 48 hours is too infrequent to accurately assess drainage in a closed wound drainage system. Frequent monitoring (e.g., every shift) is needed to track output, detect complications like excessive bleeding, and ensure system functionality, making this intervention inadequate for assessment. Choice B reason: Stripping the chest tube vigorously is not recommended, as it can increase intrathoracic pressure, risking tissue damage or bleeding. It does not assess drainage amount but manipulates the tube, potentially causing harm. Assessment requires observing output in the collection chamber, making this action incorrect. Choice C reason: Maintaining the collection chamber below the client’s chest ensures proper drainage by gravity in a closed wound drainage system, like a chest tube. This position prevents backflow and allows accurate measurement of drainage output in the chamber, essential for assessing fluid loss and detecting complications like hemothorax. Choice D reason: Adding water to the water seal chamber maintains system function but does not directly assess drainage amount. The water seal prevents air re-entry, not measures output. Assessment involves observing and recording drainage in the collection chamber, making this action irrelevant to the question’s focus.