HAS-BLED Score Calculator
HAS-BLED Score Calculator for Cardiology. Higher scores identify patients needing closer monitoring and correction of modifiable bleeding risk factors; they do not automatically mean anticoagulation should be withheld.
How this calculator works
HAS-BLED estimates major bleeding risk in patients with atrial fibrillation using hypertension, renal or liver dysfunction, stroke, bleeding history, labile INR, age, drugs, and alcohol.
Inputs used
- Blood pressure
- Renal/liver disease
- Stroke history
- Bleeding history
- INR control
- Age
- Drugs/alcohol
Clinical interpretation
Higher scores identify patients needing closer monitoring and correction of modifiable bleeding risk factors; they do not automatically mean anticoagulation should be withheld.
Limitations and safety notes
Bleeding and stroke risk must be interpreted together. Apply current AF guidelines, anticoagulant choice, renal function, and shared decision-making.
References
- Pisters R, Lane DA, Nieuwlaat R, et al. A novel user-friendly score to assess bleeding risk in atrial fibrillation. Chest. 2010.
- ACC/AHA/HRS atrial fibrillation guideline resources.
Editorial review and citation methodology
Reviewed by the Quick Medical Calculator Editorial Team. Last reviewed: June 19, 2026. The review checks calculator inputs, intended population, interpretation, limitations, and source alignment.
- Prefer original validation studies for scoring systems and prediction tools.
- Use current specialty society guidance, transplant allocation policy, public health guidance, or regulator resources when they govern clinical use.
- Include limitations and safety notes when a calculator is population-specific, context-dependent, or unsuitable as a standalone decision tool.