HAS-BLED Score

Bleeding risk on anticoagulation in atrial fibrillation.

Risk Factors

Hypertension(max +1)

Uncontrolled SBP >160 mmHg

Abnormal Renal/Liver Function(max +2)

1 point each: Dialysis/Cr>2.3, cirrhosis/bili>2×/AST/ALT>3×

Stroke(max +1)

Prior stroke history

Bleeding History(max +1)

Prior major bleeding or predisposition

Labile INRs(max +1)

Unstable/high INRs, TTR <60%

Elderly (>65)(max +1)

Age greater than 65 years

Drugs or Alcohol(max +2)

1 point each: Antiplatelets/NSAIDs, alcohol ≥8 drinks/week

HAS-BLED Score

0 / 9

Annual Major Bleeding: 1.0%

Low Risk

Continue anticoagulation as indicated by CHA₂DS₂-VASc.

Remember: High HAS-BLED does NOT contraindicate anticoagulation. It identifies patients needing closer follow-up and risk factor modification.

Frequently Asked Questions
How to Use

About the HAS-BLED Calculator

What it calculates

Estimates bleeding risk in atrial fibrillation patients on anticoagulation using the HAS-BLED score.

When to use it

Use alongside CHA₂DS₂-VASc when deciding on anticoagulation — high HAS-BLED does not contraindicate therapy but signals need for monitoring.

Example

A HAS-BLED score ≥3 indicates high bleeding risk; address modifiable factors like uncontrolled hypertension.

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