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HAS-BLED Score (Major Bleeding Risk)

Written by the Elysia Tools team · Last updated：2026-08-06

This tool is for informational purposes only and does not constitute medical, financial, or legal advice; consult a qualified professional for advice.

Calculate the HAS-BLED score to estimate major bleeding risk in patients on oral anticoagulation (most commonly combined with CHA₂DS₂-VASc in atrial fibrillation). Each component scores 1 point: Hypertension (uncontrolled, systolic BP >160), Abnormal renal function (dialysis/transplant/Cr >2.26 mg/dL), Abnormal liver function, prior Stroke, prior major Bleeding/predisposition, Labile INR (TTR <60% on warfarin), Elderly (age >65), Drugs (antiplatelet/NSAID), Alcohol (≥8 drinks/week). Range 0–9 (renal/liver and drugs/alcohol can each contribute up to 2). Interpretation: 0 low, 1–2 moderate, ≥3 high risk — regular review and correct reversible factors; a high score alone does NOT justify withholding anticoagulation. Derived from Pisters 2010 (Chest) and the 2023 ACC/AHA/ACCP/HRS AF guideline. The 'labile INR' criterion mainly applies to warfarin users; predictive value is lower for DOACs. Not medical advice.

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Tool usage guide

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Key facts

Category
Health
Input types
checkbox
Output type
json
Sample coverage
4
API ready
Yes

Overview

The HAS-BLED Score calculator estimates major bleeding risk in patients taking oral anticoagulants. Select the applicable clinical factors to calculate a score from 0 to 9 and view the corresponding risk category: low, moderate, or high.

When to use

  • Assess bleeding risk in a patient receiving oral anticoagulation, especially for atrial fibrillation.

© 2026 Elysia Tools. All rights reserved.

Review modifiable bleeding risk factors such as uncontrolled hypertension, NSAID use, or excess alcohol intake.
  • Support a broader anticoagulation review alongside stroke-risk assessment and clinical judgment.

    • How it works

    1. 1Select each applicable HAS-BLED factor, including hypertension, renal or liver dysfunction, prior stroke, bleeding history, labile INR, age over 65, drugs, and alcohol.
    2. 2The calculator assigns points to the selected factors and adds them to produce the total score.
    3. 3The result categorizes the score as low, moderate, or high bleeding risk.
    4. 4Use the result to identify factors for review; a high score alone does not justify withholding anticoagulation.

    Use cases

    • Cardiology and atrial fibrillation reviews where bleeding risk is considered alongside CHA₂DS₂-VASc.
    • Anticoagulation clinics reviewing warfarin control, medication use, and modifiable risk factors.
    • Clinical education and documentation of the factors contributing to a bleeding-risk assessment.

    Examples

    1. Elderly warfarin patient with several modifiable risks

    Anticoagulation clinician

    Background

    A patient taking warfarin is over 65 and has uncontrolled hypertension, unstable INR control, and concurrent NSAID use.

    Problem

    Estimate the patient's HAS-BLED score and identify factors that require review.

    How to use

    Select Hypertension, Labile INR, Age > 65 years, and Drugs (antiplatelet / NSAID). Leave the other factors unselected.

    hypertension=true; renal=false; liver=false; stroke=false; bleeding=false; labileInr=true; elderly=true; drugs=true; alcohol=false

    Outcome

    The calculator returns a total score of 4, categorized as high risk (≥3), supporting review of blood pressure, INR stability, and NSAID use.

    2. Single risk factor in an older anticoagulated patient

    Primary care clinician

    Background

    A patient receiving oral anticoagulation is over 65 but has no reported hypertension, renal or liver dysfunction, prior stroke, bleeding history, labile INR, relevant drugs, or excess alcohol use.

    Problem

    Calculate the score when age is the only selected HAS-BLED factor.

    How to use

    Select Age > 65 years only and leave the remaining checkboxes unselected.

    hypertension=false; renal=false; liver=false; stroke=false; bleeding=false; labileInr=false; elderly=true; drugs=false; alcohol=false

    Outcome

    The calculator returns a total score of 1, categorized as moderate risk (1–2), with continued attention to modifiable factors.

    FAQ

    What does the HAS-BLED Score measure?

    It estimates the risk of major bleeding in patients taking oral anticoagulants.

    What is the HAS-BLED score range?

    The score ranges from 0 to 9.

    How is the HAS-BLED score interpreted?

    A score of 0 is low risk, 1–2 is moderate risk, and 3 or higher is high risk.

    Does a high HAS-BLED score mean anticoagulation should be stopped?

    No. A high score calls for regular review and correction of reversible factors, but does not by itself justify stopping anticoagulation.

    Does the labile INR criterion apply to DOAC users?

    It mainly applies to patients taking warfarin; its predictive value is lower for DOACs.

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