GI Bleed Assessment (Gastrointestinal) is a clinical judgment topic: connect assessment data to risk, choose the first safe nursing action, and know when to delegate versus retain responsibility. Canadian items may use metric units and provincial wording; prioritization logic matches NCLEX-RN. Gastrointestinal bleeding is classified as upper (proximal to the ligament of Treitz at the duodenojejunal junction) or lower, with differing etiologies, hemodynamic consequences, and management. Upper GI bleeding from peptic ulcer disease occurs when mucosal defense mechanisms (mucus-bicarbonate barrier, prostaglandin-mediated mucosal blood flow, epithelial cell renewal) are overwhelmed by aggressive factors -- Helicobacter pylori infection (present in 60-80% of peptic ulcers) disrupts the mucus layer through urease-mediated ammonia production and vacuolating cytotoxin (VacA), while NSAIDs inhibit cyclooxygenase-1 (COX-1), reducing protective prostaglandin E2 synthesis and impairing mucosal blood flow. When ulceration erodes into submucosal arteries, brisk hemorrhage produces hematemesis (bright red or coffee-ground emesis depending on contact time with gastric acid converting hemoglobin to acid hematin) and melena (black, tarry stool from degradation of hemoglobin by intestinal bacteria). Variceal bleeding from portal hypertension (portal pressure gradient exceeding 12 mmHg) causes...