Cardiology

HAS-BLED Score

Major bleeding risk on anticoagulation in atrial fibrillation.

Education and reference only. Not a substitute for clinical judgement, local policy or product labelling. Always verify before clinical use. Values are calculated in your browser and never stored.

When to use

Use alongside stroke-risk scoring in AF to estimate 1-year major bleeding risk on anticoagulation and to flag modifiable risk factors.

Why use

It highlights correctable bleeding risks rather than withholding anticoagulation, and complements CHA₂DS₂-VASc.

Advice

A score ≥3 indicates higher bleeding risk and warrants caution and regular review, but is NOT a reason to withhold anticoagulation — address the modifiable factors.

Evidence & references

Pisters R et al. A novel user-friendly score (HAS-BLED) to assess 1-year risk of major bleeding in atrial fibrillation. Chest. 2010.

About the creator

Pisters R, Lip GYH et al.

Related calculators

Need a calculator we don't have — or a custom tool?

We build evidence-led clinical calculators, dashboards and reference tools for teams.

Request a Custom Tool ☎ +44 7448 439750