Clinical reference calculator · GeraClinic

HAS-BLED Bleeding Risk Score Calculator

The HAS-BLED score estimates the 1-year risk of major bleeding in people with atrial fibrillation who are considered for, or taking, anticoagulation. It scores seven factors from 0 to 9 points.

Quick answer

HAS-BLED scores seven bleeding-risk factors (uncontrolled hypertension, abnormal kidney/liver function, stroke, bleeding history, labile INR, age over 65, drugs/alcohol) from 0 to 9 to estimate 1-year major-bleeding risk on anticoagulation. A score of 3 or more flags higher risk.

Bleeding-risk factors

Hypertension (uncontrolled, systolic > 160 mmHg)+1Abnormal renal functionDialysis, transplant, or creatinine ≥ 200 µmol/L (2.26 mg/dL)+1Abnormal liver functionCirrhosis, bilirubin > 2× normal with AST/ALT/ALP > 3× normal+1Stroke history+1Bleeding history or predispositionPrior major bleed, or anaemia+1Labile INRUnstable/high INR, or time in therapeutic range < 60%+1Elderly (age > 65)+1Drugs predisposing to bleedingAntiplatelet agents or NSAIDs+1Alcohol excess (≥ 8 units/week)+1

0/ 9

Lower bleeding risk

A HAS-BLED score of 0 indicates lower bleeding risk. A score of ≥ 3 flags patients who warrant caution and more frequent review on anticoagulation — it is not a reason to withhold anticoagulation by itself; many modifiable factors (blood pressure, NSAIDs, alcohol, labile INR) can be addressed.

How to use the HAS-BLED calculator

1Tick each bleeding-risk factor. Tick the factors that apply: uncontrolled hypertension, abnormal renal or liver function, stroke, bleeding history, labile INR, age over 65, and bleeding-predisposing drugs or excess alcohol.
2Read the total. The tool totals the points (0–9).
3Interpret with a clinician. A score of 3 or more indicates higher bleeding risk — a prompt for caution and review, not a reason to stop anticoagulation on its own.

Medical disclaimer: This is general health information, not medical advice. It does not diagnose or treat any condition, and the results are estimates based on public reference formulas. Always consult a qualified doctor about your individual health. If you think you may have a medical emergency, contact your local emergency services immediately.

Talk to a doctor

Get a professional evaluation from a verified doctor by video, audio, or chat — available across 60+ countries on GeraClinic.

Book a consultation

Frequently asked questions

Does a high HAS-BLED mean I should stop anticoagulation?⌄

No. A high HAS-BLED score is a flag to address modifiable factors (blood pressure, NSAID use, alcohol, unstable INR) and review more often — not an automatic reason to withhold anticoagulation, which still prevents strokes.

What counts as a high HAS-BLED score?⌄

A score of 3 or more is generally considered high bleeding risk in the original study (Pisters 2010).

How does HAS-BLED relate to CHA₂DS₂-VASc?⌄

CHA₂DS₂-VASc estimates stroke risk and HAS-BLED estimates bleeding risk. Clinicians weigh them together when deciding on anticoagulation.

Sources & validation

This calculator reproduces the published HAS-BLED score, validated for 1-year major-bleeding risk on anticoagulation in atrial fibrillation.

Pisters R, Lane DA, Nieuwlaat R, et al. A novel user-friendly score (HAS-BLED) to assess 1-year risk of major bleeding in patients with atrial fibrillation (CHEST 2010;138:1093-1100) — verified 2026-06-18

Related clinical calculators

CHA₂DS₂-VASc Wells DVT Wells PE

Need to discuss a result? Find and book a verified doctor on GeraClinic.