HAS-BLED Score Calculator
Estimate the risk of major bleeding in people with atrial fibrillation who are taking, or considering, anticoagulation.
UK guidance: NICE guideline NG196 (recommendation 1.2.2) recommends the ORBIT score rather than HAS-BLED for assessing bleeding risk in atrial fibrillation, because it predicts absolute bleeding risk more accurately. HAS-BLED is still widely used and appears in European (ESC) guidance.
Important Clinical Disclaimer:
The HAS-BLED Calculator is intended for use by qualified healthcare professionals only.
It is for educational and informational purposes and should not replace clinical judgement.
Always interpret results alongside the full clinical picture and follow your local guidelines and protocols.
HAS-BLED Score
Clinical Recommendation
About This Score
HAS-BLED Score
The HAS-BLED score estimates the risk of major bleeding for patients on anticoagulation. It helps identify and address modifiable risk factors to reduce bleeding risk.
Components:
- H: Hypertension (SBP > 160 mmHg) (1 point)
- A: Abnormal renal/liver function (1 point each, max 2 points)
- S: Stroke history (1 point)
- B: Bleeding history or predisposition (1 point)
- L: Labile INR (1 point)
- E: Elderly (Age > 65 years) (1 point)
- D: Drugs/alcohol (1 point each, max 2 points)
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
- Pisters R, Lane DA, Nieuwlaat R, et al. (2010). A novel user-friendly score (HAS-BLED) to assess 1-year risk of major bleeding in patients with atrial fibrillation: the Euro Heart Survey. Chest, 138(5), 1093-1100.
- NICE (2021). Atrial fibrillation: diagnosis and management (NG196).