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Glasgow-Blatchford Score (GI Bleed)

Glasgow-Blatchford Score — Upper GI Bleed Risk

Blodureakvävigt (urea)

mmol/L

Haemoglobin

g/dL

Sex

Systoliskt blodtryck

mmHg

Pulse ≥ 100 bpm (+1)

Melena (+1)

Synkopé vid presentation (+2)

Leverssjukdomshistoria (+2)

Hjärtsvikt (+2)

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Detailed Guide Coming Soon

We're working on a comprehensive educational guide for the Glasgow-Blatchford Score (GI Bleed) in your language. The content below is shown in English.

Vad är Glasgow-Blatchford Score (GI Bleed)?

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The Glasgow-Blatchford Score (GBS) is a validated clinical risk stratification tool used to identify patients presenting with acute upper gastrointestinal bleeding (UGIB) who require urgent hospital intervention — including endoscopy, blood transfusion, or surgery — and those who are safe for outpatient management. First described by Blatchford and colleagues in 2000 using data from Glasgow hospitals, the score uses exclusively pre-endoscopic clinical and laboratory parameters, making it immediately applicable upon first patient assessment in the emergency department. The GBS evaluates blood urea nitrogen (BUN), haemoglobin (Hb), systolic blood pressure (SBP), heart rate, presence of melena, presence of syncope, known hepatic disease, and known cardiac failure. Each component contributes points ranging from 0 to 6, with a maximum possible score of 23. The key clinical utility of the GBS is its negative predictive value at zero: a score of 0 identifies patients at very low risk (approximately 0.5% rebleeding rate and near-zero 30-day mortality), who may be safely discharged from the emergency department without urgent endoscopy and managed as outpatients. This has been validated in multiple large prospective cohorts and reduces unnecessary hospital admissions. Conversely, scores of 6 or above are associated with a high likelihood of requiring clinical intervention. The GBS consistently outperforms the Rockall score for pre-endoscopic risk stratification and is recommended by multiple international guidelines including NICE and the British Society of Gastroenterology.

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Formel

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f(x)

GBS = points(BUN) + points(Hb) + points(SBP) + points(pulse≥100bpm) + points(melena) + points(syncope) + points(hepatic disease) + points(cardiac failure); Score 0–23

Variabelbeskrivning

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Symbol	Namn	Enhet	Beskrivning
BUN	Blood Urea Nitrogen	mg/dL	Rises in UGIB due to protein digestion of luminal blood; the BUN-to-creatinine ratio is a classic marker of upper GI bleeding source.
Hb	Haemoglobin	g/dL	Reflects acute blood loss. Sex-specific thresholds are used because normal haemoglobin ranges differ between males and females.
SBP	Systolic Blood Pressure	mmHg	Haemodynamic marker — hypotension indicates significant volume loss and haemodynamic compromise.
HR	Heart Rate	beats per minute	Tachycardia (≥100 bpm) is a compensatory response to volume depletion and adds 1 point to the GBS.

Hur man Glasgow-Blatchford Score (GI Bleed)

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1Measure BUN (blood urea nitrogen) and assign points: 0 pts for <18.2 mg/dL, 2 pts for 18.2–22.3, 3 pts for 22.4–27.9, 4 pts for 28–69.9, 6 pts for ≥70 mg/dL.
2Measure haemoglobin and assign points by sex: males — 0 pts for ≥13 g/dL, 1 pt for 12–12.9, 3 pts for 10–11.9, 6 pts for <10; females — 0 pts for ≥12 g/dL, 1 pt for 10–11.9, 6 pts for <10.
3Measure systolic blood pressure: 0 pts for ≥110 mmHg, 1 pt for 100–109, 2 pts for 90–99, 3 pts for <90 mmHg.
4Assess heart rate: add 1 point if pulse ≥100 beats per minute at presentation.
5Assess for melena (black tarry stools, indicating upper GI bleeding): add 1 point if present.
6Assess for syncope (loss of consciousness at presentation or during the bleeding episode): add 2 points if present.
7Assess history of known hepatic disease (cirrhosis, portal hypertension): add 2 points if present. Assess history of cardiac failure: add 2 points if present. Sum all points for the GBS.

Lösta exempel

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Exempel 1Very low-risk — safe for outpatient discharge

Givet:BUN 15 mg/dL, Hb 14 g/dL (male), SBP 120 mmHg, HR 72, no melena, no syncope, no liver disease, no cardiac failure

Resultat:GBS = 0

0.5% rebleeding rate — safe for outpatient management without urgent endoscopy

A score of 0 meets the validated threshold for safe discharge. This patient can be managed with proton pump inhibitor therapy and outpatient follow-up endoscopy.

Exempel 2Intermediate risk — hospital admission required

Givet:BUN 30 mg/dL, Hb 11 g/dL (male), SBP 105 mmHg, HR 95, melena present, no syncope, no liver disease, no cardiac failure

Resultat:GBS = 9

Requires urgent hospital admission and early endoscopy

A GBS of 9 indicates significant risk of requiring intervention. Early endoscopy within 24 hours is indicated, along with IV PPI therapy and crossmatch for potential transfusion.

Exempel 3High risk with liver disease — urgent intervention

Givet:BUN 45 mg/dL, Hb 9.5 g/dL (female), SBP 88 mmHg, HR 110, melena, syncope, known cirrhosis, no cardiac failure

Resultat:GBS = 19

Very high risk — emergency endoscopy and ICU-level monitoring required

Multiple high-risk features combine to produce a very high GBS. This patient needs immediate resuscitation, urgent endoscopy (ideally within 12 hours), and vasopressor/blood product support.

Exempel 4Female patient with anaemia and cardiac comorbidity

Givet:BUN 25 mg/dL, Hb 10.5 g/dL (female), SBP 100 mmHg, HR 98, no melena, no syncope, no liver disease, known cardiac failure

Resultat:GBS = 7

Requires admission — cardiac failure increases transfusion trigger

The cardiac failure comorbidity not only adds 2 points but also lowers the haemoglobin transfusion threshold. This patient needs inpatient monitoring and early endoscopy.

Praktiska tillämpningar

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Primary care physicians and internists use Glasgow Blatchford during routine clinical assessments to screen patients, establish baselines for longitudinal monitoring, and identify individuals who may need referral to specialists for further diagnostic evaluation or therapeutic intervention.

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Hospital clinical pharmacists apply Glasgow Blatchford to verify drug dosing calculations, particularly for medications with narrow therapeutic indices like warfarin, aminoglycosides, and chemotherapy agents where patient-specific factors such as renal function and body weight critically affect safe dosing ranges.

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Public health epidemiologists use Glasgow Blatchford in population-level screening programs to calculate disease prevalence, assess screening test sensitivity and specificity, and determine the number needed to screen to detect one case in various demographic subgroups.

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Clinical researchers incorporate Glasgow Blatchford into study design protocols to calculate sample sizes, determine statistical power for detecting clinically meaningful differences, and establish inclusion criteria based on quantitative physiological thresholds.

Specialfall

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Pediatric versus adult reference ranges

In practice, this edge case requires careful consideration because standard assumptions may not hold. When encountering this scenario in glasgow blatchford calculations, practitioners should verify boundary conditions, check for division-by-zero risks, and consider whether the model's assumptions remain valid under these extreme conditions.

Pregnancy and hormonal variations

Extreme body composition

Chronic anaemia at baseline

Patients with pre-existing chronic anaemia (from iron deficiency, renal disease, or haemolysis) may have a low haemoglobin at baseline unrelated to acute bleeding, potentially inflating the GBS. Always review the patient's baseline haemoglobin when interpreting the score.

Glasgow-Blatchford Score Components and Points

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Variable	Threshold	Points
BUN (mg/dL)	< 18.2	0
BUN (mg/dL)	18.2–22.3	2
BUN (mg/dL)	22.4–27.9	3
BUN (mg/dL)	28–69.9	4
BUN (mg/dL)	≥ 70	6
Hb male (g/dL)	≥ 13	0
Hb male (g/dL)	12–12.9	1
Hb male (g/dL)	10–11.9	3
Hb male (g/dL)	< 10	6
Hb female (g/dL)	≥ 12	0
Hb female (g/dL)	10–11.9	1
Hb female (g/dL)	< 10	6
SBP (mmHg)	≥ 110	0
SBP (mmHg)	100–109	1
SBP (mmHg)	90–99	2
SBP (mmHg)	< 90	3
Pulse ≥ 100 bpm	Present	1
Melena	Present	1
Syncope	Present	2
Hepatic disease	Present	2
Cardiac failure	Present	2

Vanliga frågor

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What is the maximum Glasgow-Blatchford Score?

Glasgow Blatchford is a specialized calculation tool designed to help users compute and analyze key metrics in the health and medical domain. It takes specific numeric inputs — typically drawn from real-world data such as measurements, rates, or quantities — and applies a validated mathematical formula to produce actionable results. The tool is valuable because it eliminates manual calculation errors, provides instant feedback when exploring different scenarios, and serves as both a decision-support instrument for professionals and a learning aid for students studying the underlying principles.

How is the Glasgow-Blatchford Score calculated?

The Glasgow-Blatchford Score is calculated based on several clinical parameters, including urea, hemoglobin, systolic blood pressure, and the presence of melena or syncope. Each parameter is assigned a score, and the total score ranges from 0 to 23. For example, a urea level above 6.5 mmol/L is assigned 2 points, while a hemoglobin level below 10 g/dL is assigned 6 points. The score is then used to predict the need for clinical intervention.

What is the significance of a high Glasgow-Blatchford Score?

A high Glasgow-Blatchford Score is associated with an increased risk of requiring urgent hospital intervention, including endoscopy, blood transfusion, or surgery. Studies have shown that patients with a score above 5 are more likely to require intervention, with a score above 10 indicating a high risk of mortality. For instance, a patient with a score of 12 is at higher risk of needing immediate medical attention compared to a patient with a score of 3. The score helps clinicians prioritize patients who require prompt evaluation and treatment.

Can the Glasgow-Blatchford Score be used in patients with liver disease?

Yes, the Glasgow-Blatchford Score can be used in patients with liver disease, but with caution. Liver disease can affect the urea and hemoglobin levels, which are components of the score. For example, a patient with cirrhosis may have a lower urea level due to decreased hepatic function, which could result in a lower Glasgow-Blatchford Score. Clinicians should consider the patient's underlying liver disease when interpreting the score and use their clinical judgment to determine the need for intervention.

How does the Glasgow-Blatchford Score compare to other risk stratification tools?

The Glasgow-Blatchford Score has been compared to other risk stratification tools, such as the Rockall score, and has been shown to be more accurate in predicting the need for clinical intervention. A study found that the Glasgow-Blatchford Score had a higher sensitivity and specificity than the Rockall score in predicting outcomes in patients with acute upper gastrointestinal bleeding. The Glasgow-Blatchford Score is also easier to calculate, as it requires fewer variables, making it a more practical tool for clinicians to use in emergency settings.

Vanliga misstag att undvika

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!Using SI units (mmol/L) for BUN without converting to mg/dL (multiply mmol/L by 2.8 for BUN in mg/dL) — the GBS thresholds are defined in mg/dL.
!Applying male haemoglobin thresholds to female patients, underestimating risk in women whose lower baseline Hb means a higher GBS component.
!Forgetting that syncope contributes 2 points, not 1 — its higher weighting reflects the severity of haemodynamic compromise it represents.
!Confusing GBS with the Rockall score — the Rockall includes endoscopic findings while GBS is pre-endoscopic only.
!Discharging a GBS 0 patient without confirming haemodynamic stability, ability to take oral fluids, and a clear outpatient follow-up plan.
!Omitting the cardiac failure and hepatic disease history fields, which collectively contribute up to 4 points and can elevate a low-risk score into the intermediate-risk category.

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Proffstips

Always convert BUN from SI units (urea in mmol/L) to mg/dL if your laboratory reports in SI: multiply mmol/L by 2.8. This is one of the most frequent calculation errors with the GBS in countries using SI units.

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Visste du?

The Glasgow-Blatchford Score was developed by analysing 1,748 consecutive patients presenting with acute upper GI bleeding to hospitals in Glasgow, Scotland, in the mid-1990s. The study was remarkable for including a prospective validation cohort — rare for clinical prediction tools of that era — giving the GBS unusually robust evidence from the outset.

Referenser

📖Svårighetsgrad:Medel

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