Intended population
Adults with atrial fibrillation undergoing assessment of bleeding risk, particularly before or during antithrombotic treatment.
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AnticoagulationAvailable
HAS-BLED
Bleeding Risk Assessment in Atrial Fibrillation
Identifies bleeding-risk factors in patients with atrial fibrillation and highlights potentially modifiable causes that require clinical review.
Evidence basis
Validated clinical bleeding-risk score for patients with atrial fibrillation
Guideline
Used in contemporary atrial fibrillation guidance as a structured approach to identifying and correcting modifiable bleeding-risk factors.
Calculator
Clinical variables
Standard HAS-BLED factors
Select every clinical factor that applies to the patient. Each selected factor adds one point.
Abnormal renal or liver function
Renal and hepatic dysfunction are scored independently. Selecting both adds two points.
0 of 9 possible factors selected
The result updates automatically after each selection.
Clinical information
Interpretation and use
Primary clinical value
The score provides a structured method for identifying potentially modifiable factors such as uncontrolled blood pressure, labile INR, interacting drugs and excess alcohol use.
High-risk threshold
A score of 3 or more is commonly treated as a high-risk flag requiring earlier review, correction of reversible factors and more frequent clinical follow-up.
Dynamic reassessment
Bleeding risk is not static. HAS-BLED should be reassessed when blood pressure, renal or hepatic function, medication exposure, alcohol use or anticoagulation control changes.
Scientific basis
References
Original derivation study
Pisters R, Lane DA, Nieuwlaat R, de Vos CB, Crijns HJ, Lip GY. 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. 2010 Nov;138(5):1093-100. doi: 10.1378/chest.10-0134. Epub 2010 Mar 18. PMID: 20299623.
Clinical interpretation
The score is intended primarily to identify patients who require closer follow-up and correction of modifiable bleeding-risk factors. A high score is not an automatic contraindication to oral anticoagulation.
Medical disclaimer
EP-SCORE AI provides clinical decision-support tools for educational and professional use. Calculator results do not constitute a diagnosis or treatment recommendation and must not replace individualized clinical assessment, current guidelines or professional medical judgment.