Why use it

Best validated tool for identifying low-risk UGI bleeding patients safe for outpatient management. GBS = 0 identifies ~15% of UGI bleeders who can avoid hospitalization with >99% safety. Endorsed by BSG, ACG, and AGA guidelines for risk stratification.

About

The Glasgow-Blatchford Bleeding Score (GBS) predicts the need for clinical intervention (transfusion, endoscopic therapy, or surgery) in patients with acute upper gastrointestinal (UGI) bleeding before endoscopy. A score of 0 identifies patients at very low risk who may be safely managed as outpatients. The GBS is more sensitive than the Rockall score for predicting need for intervention and identifying low-risk patients.

When to use

Acute upper GI bleeding before endoscopy
Identifying patients safe for outpatient endoscopy (GBS = 0)
Determining urgency of endoscopic intervention
Emergency department triage for UGI bleed

Formula

Points assigned to BUN, Hgb (sex-specific), SBP, HR, Melena, Syncope, Hepatic disease, Cardiac failure Total: 0–23 GBS 0 = low risk; ≥ 1 = not low risk

Pearls & pitfalls

GBS = 0 has NPV >99% for need for intervention — strongest evidence for safe outpatient management.
GBS is superior to AIMS65 for predicting need for intervention; AIMS65 is better for mortality prediction.
Syncope and low hemoglobin are the highest-weighted items in GBS.
Hemoglobin thresholds are sex-specific: < 13 g/dL (male) and < 12 g/dL (female) score differently.
British Society of Gastroenterology 2019 guidelines recommend GBS = 0 as threshold for safe discharge.
BUN elevation (> 6.5 mmol/L ≈ > 18 mg/dL) reflects digested blood protein and is an early GI bleed marker.

Next steps

GBS 0: Very low risk (~5% need for intervention) — consider outpatient management, elective endoscopy. GBS 1–2: Low risk — may consider early discharge with next-day outpatient endoscopy. GBS ≥ 3: Moderate-high risk — admit for inpatient endoscopy. GBS ≥ 7: High risk — urgent endoscopy within 24h.

Evidence

Derived by Blatchford et al. (Lancet 2000) from 1,748 patients. Validated in multiple international cohorts. AUC 0.88–0.92 for need for intervention. Outperforms Rockall score pre-endoscopy for this endpoint. BSG guideline recommended.

References

Blatchford O et al. A risk score to predict need for treatment for upper-gastrointestinal haemorrhage. Lancet. 2000;356(9238):1318-1321. — link
Stanley AJ et al. Outpatient management of patients with low-risk upper-gastrointestinal haemorrhage: multicentre validation and prospective evaluation. Lancet. 2009;373(9657):42-47. — link

Glasgow-Blatchford Bleeding Score (GBS)

Calculator