A complication is not merely an abnormal finding. It is a new problem, or an expected risk becoming clinically important, that threatens recovery. Safe nursing recognition depends on knowing the patient's baseline, the expected course of the illness or procedure, and which changes require immediate action. The RN compares trends rather than isolated numbers, identifies the most dangerous plausible explanation, protects airway, breathing, circulation, and neurologic function, and escalates with a concise account of what changed and when. On the exam, writers often pair stable-sounding options with unstable data—notice the mismatch before you commit. If the stem names a license or role, reread that line; scope errors are classic trap answers even when the clinical topic is familiar. Run a 60-second scan: breathing work and oxygenation, perfusion and end organs, neuro baseline, likely infection sources, and devices that can fail quietly. When two answers feel partly right, pick the one that reduces imminent harm and matches orders for the role you were given. Train yourself to state the primary risk in one short phrase before you read the options so...