TPN Line Care Basics (Nutrition & Elimination) is a clinical judgment topic: connect assessment data to risk, choose the first safe nursing action, and know when to delegate versus retain responsibility. US NCLEX-RN items often test unstable vs stable, delegation, and first action. Connect Total Parenteral Nutrition and Central-Line Safety to bedside cues you will reassess first: vitals trends, work of breathing, perfusion, mentation, and pain or ischemic equivalents when relevant. NCLEX items often reward recognizing when subtle instability outweighs reassurance, then selecting nursing actions that protect airway, circulation, and neurologic status before routine tasks.