Comprehensive nursing assessment at the nurse level integrates knowledge of pathophysiology with clinical reasoning to detect early deterioration and guide intervention. The registered nurse correlates physical findings with underlying physiological mechanisms: jugular venous distension reflects elevated right atrial pressure from volume overload or right ventricular failure; an S3 gallop indicates rapid ventricular filling against a non-compliant, volume-overloaded ventricle in heart failure; and a decline in Glasgow Coma Scale score signals rising intracranial pressure or decreased cerebral perfusion. Advanced assessment requires pattern recognition across body systems, the ability to distinguish compensated from decompensating states, and the clinical judgment to prioritize findings, intervene, and escalate appropriately using evidence-based frameworks such as SBAR, clinical decision rules, and early warning scoring systems.