Upper GI Endoscopy for Acute Upper Gastrointestinal Bleeding

Clinical Indications and Guidelines

The American College of Radiology recommends upper endoscopy as the most appropriate test for nonvariceal upper gastrointestinal bleeding (UGIB) due to its ability to identify the bleeding source in 95% of cases and provide simultaneous therapeutic intervention 1
Upper endoscopy should be performed within 24 hours of presentation after hemodynamic stabilization, as it allows for both diagnosis and treatment in a single procedure 1
The American College of Radiology explicitly states that upper endoscopy is the most appropriate test in clinical scenarios involving nonvariceal UGIB 1

The post-surgical status does not contraindicate upper endoscopy if the surgery was not on the upper GI tract, as there are no fresh upper GI anastomoses at risk 2
The American College of Radiology guidelines specify that endoscopy is contraindicated only when there are new upper GI anastomotic sites, vascular post-surgical edema of the upper GI tract, or concern for upper GI perforation 2

CT scan, including CT angiography (CTA), is generally reserved for cases where endoscopy has failed to identify the source or when endoscopy cannot be performed, as it is purely diagnostic and does not allow therapeutic intervention 3, 4, 5
CTA has 79-85% sensitivity for detecting active bleeding but is typically reserved for cases in which endoscopy is unsuccessful in localizing the bleeding source 3, 4, 5
Ultrasound has no role in the acute evaluation of GI bleeding and cannot visualize mucosal lesions or active bleeding sites 1, 3