Glasgow-Blatchford Score Calculator
Calculate the Glasgow-Blatchford Bleeding Score (GBS) for upper gastrointestinal bleeding. Predicts need for intervention (transfusion, endoscopy, surgery) and identifies low-risk patients suitable for outpatient management. Recommended by NICE NG141.
Glasgow-Blatchford Score Parameters
About Glasgow-Blatchford Score
The Glasgow-Blatchford Bleeding Score (GBS) was developed in 2000 to predict the need for intervention in patients with acute upper GI bleeding.
Key advantages:
- Can be calculated before endoscopy
- Good at identifying low-risk patients (GBS 0-1)
- Predicts need for transfusion, endoscopy, or surgery
- Endorsed by NICE (NG141) and BSG guidelines
GBS Scoring Criteria
| Parameter | Value | Points |
|---|---|---|
| Blood Urea | 6.5-7.9 mmol/L | 2 |
| 8.0-9.9 mmol/L | 3 | |
| 10.0-24.9 mmol/L | 4 | |
| ≥25 mmol/L | 6 | |
| Haemoglobin (Men) | 120-129 g/L | 1 |
| 100-119 g/L | 3 | |
| <100 g/L | 6 | |
| Haemoglobin (Women) | 100-119 g/L | 1 |
| <100 g/L | 6 | |
| Systolic BP | 100-109 mmHg | 1 |
| 90-99 mmHg | 2 | |
| <90 mmHg | 3 | |
| Pulse ≥100 bpm | Yes | 1 |
| Melaena | Present | 1 |
| Syncope | Present | 2 |
| Hepatic Disease | Present | 2 |
| Heart Failure | Present | 2 |
Risk Stratification
| Score | Risk | Need for Intervention |
|---|---|---|
| 0 | Very Low | <1% need intervention |
| 1 | Low | ~5% need intervention |
| 2-5 | Intermediate | ~25-30% need intervention |
| ≥6 | High | >50% need intervention |
NICE NG141 Management Recommendations
GBS 0: Consider Outpatient Management
Patients with GBS 0 may be suitable for:
- Early discharge from ED
- Outpatient endoscopy within 24 hours
- PPI therapy (e.g., omeprazole 40mg BD)
- Clear safety-netting advice
- GP follow-up arranged
GBS ≥1: Admit for Assessment
Patients with GBS ≥1 should be:
- Admitted for observation and investigation
- IV access and bloods (FBC, U&E, LFTs, clotting, G&S)
- IV PPI (e.g., omeprazole 40mg)
- Endoscopy timing based on risk:
- Unstable: Immediate after resuscitation
- High risk: Within 24 hours
- Lower risk: During admission
- Transfusion if Hb <70 g/L (or <80 with ACS)
Endoscopy Timing (NICE NG141)
| Timing | Indication | Clinical Features |
|---|---|---|
| Immediate (after resuscitation) |
Unstable patients with severe acute upper GI bleed |
|
| Within 24 hours | Unstable patients who respond to resuscitation |
|
| During admission | Stable patients with low-intermediate risk |
|
Frequently Asked Questions
Glasgow-Blatchford Score (GBS):
- Use at initial presentation (pre-endoscopy)
- Best for identifying low-risk patients (GBS 0)
- Predicts need for intervention
- Helps decide admission vs outpatient management
Rockall Score:
- Pre-endoscopy Rockall can be used initially
- Full Rockall requires endoscopic findings
- Better for predicting mortality and rebleeding
- Useful post-endoscopy for prognostication
In practice: Use GBS at presentation to triage patients. If admitted, calculate full Rockall after endoscopy for ongoing risk assessment.
Patients with GBS 0 have very low risk (<1%) of needing intervention and can be considered for outpatient management. However, you must also consider:
- Social factors: Reliable adult at home? Access to transport/telephone?
- Patient understanding: Can they recognise warning symptoms?
- Access to care: Can they return quickly if needed?
- Other concerns: Any clinical suspicion not captured by GBS?
Safety-netting must include:
- Written advice on warning symptoms (fresh haematemesis, dizziness, syncope)
- Instructions to return immediately if symptoms recur or worsen
- PPI prescription (e.g., omeprazole 40mg BD for 2-4 weeks)
- Outpatient endoscopy arranged (usually within 2 weeks)
- GP follow-up letter
Anticoagulation is not directly included in the GBS, but these patients require special consideration:
- Warfarin: Check INR urgently. Consider vitamin K and/or PCC if INR elevated and significant bleeding
- DOACs: Consider reversal agents if severe bleeding (idarucizumab for dabigatran, andexanet alfa for factor Xa inhibitors where available)
- Lower threshold for admission: Even with GBS 0, consider admission if on anticoagulants
- Haematology/cardiology input: Discuss timing of anticoagulant restart
NICE recommends discussing anticoagulant management with haematology and the relevant specialty (e.g., cardiology for AF).
NICE NG141 recommends:
- General patients: Transfuse if Hb <70 g/L, target 70-90 g/L
- Acute coronary syndrome: Transfuse if Hb <80 g/L
- Massive bleeding: Follow major haemorrhage protocol
Restrictive transfusion is associated with better outcomes in GI bleeding. Avoid over-transfusion, especially in variceal bleeding where it may worsen portal pressure.
Note: These are general guidelines. Individual patient factors (symptoms, comorbidities, ongoing bleeding) should guide transfusion decisions.
Multiple studies have validated GBS for identifying low-risk patients:
- Original Blatchford study (2000): GBS 0 had <1% need for intervention
- Stanley et al. Lancet 2009: International validation, GBS 0 predicted low risk with 100% sensitivity
- NICE systematic review: Confirmed GBS 0 as safe threshold for outpatient management
Limitations:
- May miss some high-risk pathology (e.g., malignancy) identified on endoscopy
- Does not predict mortality (use Rockall for this)
- Clinical judgement should always be applied
Disclaimer
This calculator is provided for educational and informational purposes only. It is not intended to be a substitute for professional medical advice, diagnosis, or treatment.
- Always seek the advice of a qualified healthcare provider with any questions regarding a medical condition.
- Never disregard professional medical advice or delay seeking it because of information from this tool.
- Clinical decision-making should always incorporate the full clinical context, patient preferences, and local protocols.
- The creators of this tool accept no liability for decisions made based on its output.
If you are a patient: please discuss any results with your healthcare provider. This tool is designed for use by medical professionals and may not be appropriate for self-assessment.
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. doi:10.1016/S0140-6736(00)02816-6
- NICE. Acute upper gastrointestinal bleeding in over 16s: management (NG141). 2016 (updated 2019). https://www.nice.org.uk/guidance/ng141
- 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.
- Gralnek IM, et al. Diagnosis and management of nonvariceal upper gastrointestinal hemorrhage: European Society of Gastrointestinal Endoscopy (ESGE) Guideline. Endoscopy. 2015;47(10):a1-a46.
- Laine L, et al. ACG Clinical Guideline: Upper Gastrointestinal and Ulcer Bleeding. Am J Gastroenterol. 2021;116(5):899-917.
- British Society of Gastroenterology. UK guidelines on the management of variceal haemorrhage in cirrhotic patients. Gut. 2015;64(11):1680-1704.