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Acute upper gastrointestinal bleeding

ACG-based emergency risk assessment, resuscitation, transfusion, endoscopy, hemostasis and post-endoscopic care for overt upper GI bleeding.

JurisdictionUnited States
Source check2026-08-20
Clinical reviewiatroX editorial team 路 Clinical editorial review 路 reviewed 2026-08-20 路 due 2027-08-20
AudienceUnited States healthcare professionals
This is an iatroX educational summary of named United States sources, not an official guideline. It does not replace the complete source documents, local policy, specialist advice or clinical judgement. Use the named authority, current FDA labeling, applicable state law, payer rules and local protocol where relevant.

Scope of this summary

Adults with overt hematemesis, coffee-ground emesis or melena and suspected upper gastrointestinal bleeding. The 2021 ACG guideline centers on upper GI and ulcer bleeding. Suspected variceal hemorrhage, pregnancy, children, lower GI bleeding and antithrombotic reversal require additional dedicated protocols.
sources for this section:acg-upper-gi-bleeding-2021

The Bottom Line

  • Stabilize airway, breathing and circulation, establish intravenous access and assess shock before pursuing a diagnostic label; involve critical care and gastroenterology early for unstable bleeding.
  • Use emergency-department risk assessment to identify the very-low-risk patient鈥攕uch as a Glasgow-Blatchford score of 0 or 1鈥攚ho may be discharged with reliable outpatient follow-up; do not use a score to override instability or judgment.
  • For hospitalized upper GI bleeding, ACG suggests a restrictive red-cell transfusion threshold of 7 g/dL, individualized for active ischemia, ongoing exsanguination and the overall clinical context.
  • Perform upper endoscopy within 24 hours after presentation once resuscitation is underway, using evidence-based hemostasis for active bleeding or a nonbleeding visible vessel.
  • After successful endoscopic hemostasis, use high-dose proton-pump-inhibitor therapy for three days followed by twice-daily oral therapy for the first two weeks in high-risk ulcer bleeding, and eradicate H. pylori when present.
sources for this section:acg-upper-gi-bleeding-2021

Practical clinical workflow

1
Confirm bleeding features, timing, syncope, liver disease, ulcer history, NSAIDs, anticoagulants and antiplatelets; obtain serial vital signs, complete blood count, metabolic and coagulation tests and type-and-screen or crossmatch.
2
Resuscitate with monitored crystalloid and blood as indicated, protect the airway when necessary and use a multidisciplinary protocol for antithrombotic management rather than delaying hemostasis.
3
Calculate a validated risk score after initial data, admit all but reliably very-low-risk patients and arrange endoscopy within 24 hours after appropriate stabilization.
4
Apply source-supported endoscopic therapy, then match acid suppression, diet, level of observation and repeat intervention to lesion and rebleeding risk.
5
For recurrent bleeding, repeat endoscopy and endoscopic therapy before transcatheter arterial embolization when feasible; obtain surgical input when endoscopic and radiologic control fails or is unsuitable.
sources for this section:acg-upper-gi-bleeding-2021

Safety boundaries and escalation

  • Ongoing hematemesis, shock, altered consciousness, severe hypoxemia or inability to protect the airway requires immediate resuscitation and may require intubation before endoscopy.
  • Cirrhosis or portal-hypertension signs raise concern for variceal bleeding and require immediate vasoactive, antibiotic and endoscopic management under the variceal protocol.
  • A hemoglobin concentration may initially underestimate acute blood loss; use physiology, ongoing bleeding and comorbidity rather than waiting for one laboratory threshold.
  • Anticoagulant reversal and antiplatelet interruption must balance bleeding control against thrombosis using the specific drug, indication, timing and current multidisciplinary guidance.
sources for this section:acg-upper-gi-bleeding-2021acg-h-pylori-2024

Localization

US emergency, transfusion, interventional-radiology and endoscopy resources differ by hospital. Apply the ACG pathway with local massive-hemorrhage and antithrombotic protocols.
sources for this section:acg-upper-gi-bleeding-2021

Source documents

Use the linked source documents for complete recommendations, evidence grading, exclusions and implementation detail.

  1. American College of GastroenterologyACG Clinical Guideline: Upper Gastrointestinal and Ulcer BleedingDOI 10.14309/ajg.0000000000001245 路 incorporates published correction DOI 10.14309/ajg.0000000000001506 路 published 2021-05-01 路 accessed 2026-08-20
    view source
  2. American College of GastroenterologyACG Clinical Guideline: Treatment of Helicobacter pylori InfectionDOI 10.14309/ajg.0000000000002968 路 published 2024-09-01 路 accessed 2026-08-20
    view source
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