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Glasgow-Blatchford Bleeding Score Calculator

Score upper-GI bleeding risk before endoscopy from BUN, hemoglobin, blood pressure, pulse, and symptoms. A score of 0 flags low-risk patients.

Glasgow-Blatchford Bleeding Score Calculator

Scores 2, 3, 4, or 6 points at 18.2, 22.4, 28, and 70 mg/dL.

Thresholds differ by sex. Men: 13, 12, and 10 g/dL. Women: 12 and 10 g/dL.

Scores 1, 2, or 3 points below 110, 100, and 90 mmHg.

Scores 1 point at 100 or more.

Glasgow-Blatchford score

10/ 23

High risk

BUN

30mg/dL

Serum urea

10.7mmol/L

Points by component

BUN

4 pts

Hemoglobin

3 pts

Sys. BP

1 pt

Pulse

1 pt

Melena

1 pt

Syncope

0 pts

Hepatic

0 pts

Cardiac

0 pts

What the score suggests

A score of 6 or higher is associated with a substantially higher likelihood of needing intervention such as transfusion, endoscopy, or surgery. Arrange prompt resuscitation and inpatient endoscopy, and escalate care as clinically indicated.

Medical disclaimer

This tool is for educational use only and is not a substitute for professional medical advice, diagnosis, or treatment. The Glasgow-Blatchford score is one input into the assessment of an upper-GI bleed and never replaces clinical judgment, vital-sign trends, comorbidities, or local protocols. Decisions about admission, transfusion, and endoscopy belong with a qualified clinician.

Frequently Asked Questions about the Glasgow-Blatchford Bleeding Score Calculator

What is the Glasgow-Blatchford bleeding score?
The Glasgow-Blatchford score (GBS) estimates how likely a patient with an acute upper gastrointestinal bleed is to need a clinical intervention, such as a blood transfusion, endoscopic treatment, or surgery, or to die. It uses routine data available at first assessment, so you can apply it before endoscopy. Scores run from 0 to 23, and higher scores mean greater risk.
What does a Glasgow-Blatchford score of 0 mean?
A score of 0 identifies patients at very low risk of needing intervention or dying. Studies show many of these patients can be managed as outpatients with early outpatient endoscopy rather than being admitted. The decision still rests on clinical judgment and local protocols, since the score is one factor among many.
What values do I need to calculate it?
You need blood urea nitrogen (BUN) or serum urea, hemoglobin, systolic blood pressure, and pulse, plus four yes or no findings: melena, syncope, a history of hepatic disease, and a history of cardiac failure. This calculator accepts BUN in mg/dL or urea in mmol/L and applies the matching thresholds. Hemoglobin thresholds differ for men and women, so you also select sex.
How is the score made up and interpreted?
Each component adds points: BUN up to 6, hemoglobin up to 6, systolic blood pressure up to 3, pulse 1, melena 1, syncope 2, hepatic disease 2, and cardiac failure 2, for a maximum of 23. A score of 0 is very low risk. Higher scores, especially 6 or more, are linked with a substantially higher chance of needing intervention.
How does BUN relate to serum urea?
Serum urea in mmol/L and BUN in mg/dL measure the same thing in different units. One mmol/L of urea equals about 2.8 mg/dL of BUN, because urea nitrogen weighs 28 grams per mole. The original score used urea in mmol/L with thresholds of 6.5, 8, 10, and 25, which correspond to BUN of 18.2, 22.4, 28, and 70 mg/dL.
Is this calculator a substitute for medical advice?
No. This calculator is for education and general information only and is not a substitute for professional medical advice, diagnosis, or treatment. The Glasgow-Blatchford score supports clinical decisions but never replaces the judgment of a qualified clinician who can weigh the full clinical picture. Always seek the advice of a physician with any questions about a medical condition.

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