A nurse has been assigned to an internal disaster drill team and is triaging clients. Which of the following clients should the nurse classify with a green tag?

Choice A reason: Bleeding time assesses platelet function, not warfarin’s anticoagulant effect. Warfarin inhibits vitamin K-dependent clotting factors, unrelated to platelets. Monitoring bleeding time does not reflect therapeutic anticoagulation levels, making it irrelevant for adjusting warfarin doses to prevent thrombosis or bleeding.
Choice B reason: Factor VIII, deficient in hemophilia A, is not affected by warfarin, which targets vitamin K-dependent factors (II, VII, IX, X). Measuring Factor VIII does not indicate warfarin’s efficacy, as it is unrelated to the drug’s mechanism, making it unsuitable for dose monitoring.
Choice C reason: aPTT monitors heparin’s effect on the intrinsic clotting pathway, not warfarin’s action on vitamin K-dependent factors. Warfarin requires INR for therapeutic monitoring, as aPTT is insensitive to its effects, making it inappropriate for assessing warfarin’s anticoagulation range in patients.
Choice D reason: INR standardizes prothrombin time, measuring warfarin’s effect on vitamin K-dependent clotting factors. It ensures therapeutic anticoagulation (e.g., INR 2-3), preventing thrombosis or bleeding. INR is the gold standard for warfarin monitoring, guiding dose adjustments for safe and effective therapy.

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.