Investigations for Upper Gastrointestinal Bleeding
Esophagogastroduodenoscopy (EGD) is the primary diagnostic investigation for all patients with suspected upper GI bleeding and should be performed within 24 hours of presentation 1, 2. This is the gold standard that allows both diagnosis and therapeutic intervention in a single procedure.
Risk Stratification Tools (Pre-Endoscopy)
Before proceeding with investigations, use the Glasgow Blatchford Score (GBS) to identify very low-risk patients (score ≤1) who can be safely discharged without hospitalization or urgent endoscopy 1. These patients may undergo outpatient endoscopy. Do not use the AIMS65 score for this purpose, as guidelines explicitly recommend against it 1.
Nasogastric Tube Placement
Consider nasogastric tube placement selectively for prognostic value—the presence of blood or coffee-ground material suggests active or recent bleeding and helps guide urgency of endoscopy 1.
Primary Investigation: Endoscopy
Timing and Indications
- Standard timing: Within 24 hours for hospitalized patients 1, 2
- Earlier timing (within 12 hours): For patients with suspected variceal bleeding or portal hypertension 3
- Immediate/emergent: For hemodynamically unstable patients with massive bleeding
What Endoscopy Provides
EGD identifies the bleeding source, characterizes lesion severity (Forrest classification for ulcers), and allows immediate therapeutic intervention through injection therapy, thermal coagulation, mechanical clips, or band ligation for varices 2, 4.
Alternative/Adjunctive Investigations
CT Angiography (CTA)
Use multiphase CTA when endoscopy cannot be performed due to massive bleeding, clinical instability, or when the bleeding source location (upper vs. lower GI) is unclear 5. CTA requires:
- Noncontrast phase
- Late arterial phase
- Venous phase
CTA detects active bleeding and helps guide subsequent angiographic intervention. Dual-energy CT with virtual noncontrast images and low-keV reconstructions can improve diagnostic confidence 5.
Visceral Angiography
Perform emergent visceral angiography for patients with overt massive bleeding who are too unstable for endoscopy or when endoscopy fails to identify the source 5. Key characteristics:
- Detects bleeding rates ≥0.5 mL/min
- Allows simultaneous therapeutic embolization
- Identifies bleeding source in 72-80% of cases 5
- Perform within first 5 hours of presentation for highest diagnostic yield 5
Critical limitation: May miss venous bleeding and intermittent bleeding 5.
When Endoscopy Fails to Identify Source
If initial endoscopy is negative but bleeding continues:
- Repeat endoscopy for recurrent bleeding 2
- Angiography with embolization if endoscopic therapy fails 2, 6
- Consider push enteroscopy, capsule endoscopy, or technetium-99m-tagged RBC scan for suspected small bowel sources 7
Investigations NOT Recommended
Do not use standard CT abdomen/pelvis with or without IV contrast (as distinct from CTA protocol) for acute GI bleeding evaluation—there is no supporting evidence 5.
Common Pitfalls to Avoid
- Don't delay endoscopy in patients on anticoagulants (warfarin or DOACs)—proceed with endoscopy regardless 1
- Don't routinely use prokinetic agents (like erythromycin) before endoscopy to increase diagnostic yield, though erythromycin may be considered selectively 1, 2
- Don't perform angiography too late—early performance (within 5 hours) significantly increases detection rates 5
- Don't use tranexamic acid in upper GI bleeding 6
Algorithm Summary
- Assess hemodynamic stability → Resuscitate if unstable
- Calculate Glasgow Blatchford Score → If ≤1, consider outpatient management
- If score >1 or unstable → Hospitalize
- Standard presentation → EGD within 24 hours (within 12 hours if variceal suspected)
- Massive bleeding/too unstable for endoscopy → CTA or emergent angiography
- Endoscopy negative but bleeding continues → Repeat endoscopy or angiography
- Persistent unidentified source → Consider small bowel investigations