Glasgow-Blatchford Bleeding Score (GBS) Calculator
Calculate the original pre-endoscopy Glasgow-Blatchford Score for acute upper GI bleeding from measured urea/BUN, hemoglobin, blood pressure, pulse, and explicit clinical findings.
Content updated: View sources
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About
This Glasgow-Blatchford Bleeding Score calculator reproduces the original pre-endoscopy 2000 score for acute upper gastrointestinal bleeding. It derives points from measured values rather than asking you to choose pre-binned laboratory or vital-sign ranges. [1]
The derivation used 1,748 admitted patients and prospective validation used 197 patients. The admission variables were hemoglobin, blood urea, pulse, systolic blood pressure, melena, syncope, hepatic disease, and cardiac failure; no endoscopic finding is required. [1]
Formula
Interpretation
| Score | Source-labeled context | Boundary |
|---|---|---|
| 0 | Classic zero-score screen and within modern 0–1 very-low-risk guidance | Also matches NICE's zero-point early-discharge consideration threshold. |
| 1 | Within the ACG/ESGE/BSG 0–1 very-low-risk range | Above the classic and NICE zero-only threshold. |
| ≥2 | Above the current 0–1 very-low-risk GBS range | No additional high-risk action band is assigned. |
These are guideline contexts, not automatic disposition or treatment instructions. [2, 4, 5, 6, 7]
Original GBS 0 versus current 0–1 guidance
The original pathway and the 2009 prospective outpatient evaluation used GBS 0 as the classic low-risk screen. ACG 2021, ESGE 2021, and the BSG-led care bundle use 0–1 as a very-low-risk range in which outpatient management may be considered in the complete clinical context. NICE remains more conservative and says to consider early discharge at pre-endoscopy GBS 0. This page reports each boundary separately. [2, 4, 5, 6, 7]
Validation and endpoint limits
In a 3,012-patient international multicenter study, GBS performed best among the compared scores for the composite of intervention or death, and GBS ≤1 was the study's optimum very-low-risk threshold. GBS was substantially less useful for mortality prediction than for that composite endpoint. These population results are not an individual probability. [3]
GBS versus Rockall and AIMS65
- GBS: a pre-endoscopy score using initial clinical and laboratory findings, developed around need for treatment/adverse clinical course.
- Full Rockall: a different score that includes endoscopic findings.
- Pre-endoscopy Rockall: a separate model, not another name for GBS.
- AIMS65: a separate pre-endoscopy score with different variables and a more mortality-focused responsibility.
No conversion between these models is implemented, and modified GBS research variants are not calculated here. [3]
What the result cannot decide
GBS does not diagnose the bleeding source, distinguish variceal from nonvariceal bleeding, or independently determine discharge, admission, endoscopy timing, transfusion, medication, reversal, procedure, or treatment. Clinical instability or active severe bleeding must not wait for an online score. [5, 6, 7]
References
- Blatchford O, Murray WR, Blatchford M. A risk score to predict need for treatment for upper-gastrointestinal haemorrhage. Lancet. 2000;356(9238):1318–1321. PMID 11073021. DOI 10.1016/S0140-6736(00)02816-6.
- Stanley AJ, Ashley D, Dalton HR, et al. Outpatient management of patients with low-risk upper-gastrointestinal haemorrhage: multicentre validation and prospective evaluation. Lancet. 2009;373(9657):42–47. PMID 19091393. DOI 10.1016/S0140-6736(08)61769-9.
- Stanley AJ, Laine L, Dalton HR, et al. Comparison of risk scoring systems for patients presenting with upper gastrointestinal bleeding: international multicentre prospective study. BMJ. 2017;356:i6432. PMID 28053181. PMCID PMC5217768. DOI 10.1136/bmj.i6432.
- Siau K, Hearnshaw S, Stanley AJ, et al. British Society of Gastroenterology-led multisociety consensus care bundle for the early clinical management of acute upper gastrointestinal bleeding. Frontline Gastroenterol. 2020;11(4):311–323. PMID 32582423. PMCID PMC7307267. DOI 10.1136/flgastro-2019-101395.
- Laine L, Barkun AN, Saltzman JR, Martel M, Leontiadis GI. ACG Clinical Guideline: Upper Gastrointestinal and Ulcer Bleeding. Am J Gastroenterol. 2021;116(5):899–917. PMID 33929377. DOI 10.14309/ajg.0000000000001245.
- Gralnek IM, Stanley AJ, Morris AJ, et al. Endoscopic diagnosis and management of nonvariceal upper gastrointestinal hemorrhage: European Society of Gastrointestinal Endoscopy Guideline – Update 2021. Endoscopy. 2021;53(3):300–332. PMID 33567467. DOI 10.1055/a-1369-5274.
- National Institute for Health and Care Excellence. Acute upper gastrointestinal bleeding in over 16s: management (CG141). Published June 13, 2012; last updated August 25, 2016. Current recommendation page accessed September 9, 2026.
FAQ
The Glasgow-Blatchford Score is a pre-endoscopy risk score for acute upper gastrointestinal bleeding. It uses initial blood urea/BUN, sex-specific hemoglobin, systolic blood pressure, pulse, melena, syncope, hepatic disease, and cardiac failure; it does not require endoscopic findings.
Sources: [1]
The maximum is 23: blood urea/BUN 6, hemoglobin 6, systolic blood pressure 3, pulse 1, melena 1, syncope 2, hepatic disease 2, and cardiac failure 2. A maximum of 29 is not the original GBS.
Sources: [1]
Select the representation actually reported. This calculator scores blood urea against the original mmol/L table or BUN against the conventional published mg/dL table; it does not guess the unit or claim every arbitrary value is an exact cross-unit equivalent.
Sources: [1]
The original score assigns different hemoglobin brackets to male and female source categories. This calculator requires that source category explicitly and supports the exact g/dL and g/L threshold representations without inferring sex from another record.
Sources: [1]
GBS 0 is the classic zero-score screen used in the original and early outpatient pathway. ACG 2021, ESGE 2021, and the BSG-led care bundle use GBS 0–1 as a very-low-risk range in which outpatient management may be considered in the full clinical context, while NICE retains a zero-only early-discharge consideration threshold.
No. The score identifies a source-labeled very-low-risk context, but it does not independently determine discharge, admission, endoscopy timing, transfusion, medication, reversal, procedure, or treatment. Clinical instability or severe active bleeding must not wait for an online score.
No. GBS is a pre-endoscopy score built around treatment-related outcomes using initial findings. Full Rockall includes endoscopic findings, pre-endoscopy Rockall is a separate model, and AIMS65 uses different variables with a more mortality-focused responsibility. The scores are not interchangeable.
Sources: [3]
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Disclaimer
Educational and informational reference only. Not intended to replace professional medical advice, diagnosis, treatment, or independent verification.