HAS-BLED Score Calculator

Calculate the HAS-BLED Score to estimate bleeding risk in patients with atrial fibrillation on anticoagulation therapy. Select each clinical factor — Hypertension, Renal/Liver dysfunction, Stroke history, Bleeding history, Labile INR, Elderly (age ≥65), and Drugs/Alcohol use — and get your patient's total score along with a bleeding risk category and estimated annual bleed rate.

Uncontrolled systolic blood pressure > 160 mmHg

Dialysis, transplant, or creatinine > 2.26 mg/dL (200 µmol/L)

Cirrhosis or bilirubin >2× normal with AST/ALT/ALP >3× normal

Prior history of stroke, particularly lacunar infarct

Prior major bleeding or anemia/thrombocytopenia

Unstable/high INR or TTR < 60% on warfarin

Patient is 65 years of age or older

Concomitant use of antiplatelet agents or NSAIDs

Regular alcohol consumption of 8 or more drinks per week

Results

HAS-BLED Score

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Bleeding Risk Category

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Estimated Annual Bleed Rate

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Clinical Guidance

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Score Component Breakdown

Frequently Asked Questions

What does the HAS-BLED score stand for?

HAS-BLED is an acronym where each letter represents a risk factor: H = Hypertension (uncontrolled, SBP >160 mmHg), A = Abnormal renal or liver function, S = Stroke history, B = Bleeding history or predisposition, L = Labile INR, E = Elderly (age ≥65), D = Drugs (antiplatelets/NSAIDs) or alcohol use. Each present factor adds 1 point, with a maximum score of 9.

What HAS-BLED score indicates high bleeding risk?

A score of 0–1 indicates low risk, a score of 2 indicates moderate risk, and a score of ≥3 indicates high bleeding risk. Patients with a score ≥3 warrant caution and close review when initiating or continuing anticoagulation therapy.

Should anticoagulation be withheld in high HAS-BLED score patients?

Not necessarily. A high HAS-BLED score does not automatically mean anticoagulation should be stopped. The score is intended to flag modifiable risk factors for correction and to prompt more careful monitoring, not to exclude patients from stroke-preventing anticoagulation therapy. The CHA₂DS₂-VASc score should be weighed alongside HAS-BLED.

How accurate is the HAS-BLED score?

The HAS-BLED score was validated in the Euro Heart Survey cohort and has been endorsed by multiple international guidelines including ESC, ACC/AHA, and CCS. It performs reasonably well at identifying high-risk patients but has moderate overall discrimination (AUC ~0.6–0.7 in most studies).

What is the estimated annual bleeding rate for each score?

Based on original validation data: score 0 ≈ 1.13%/year, score 1 ≈ 1.02%/year, score 2 ≈ 1.88%/year, score 3 ≈ 3.74%/year, score 4 ≈ 8.70%/year, and score ≥5 ≈ 12.50%/year. These rates refer to major bleeding events per 100 patient-years.

Which factors in HAS-BLED are modifiable?

Several HAS-BLED components are modifiable and correcting them can reduce bleeding risk: uncontrolled hypertension can be treated, labile INR can be improved with closer monitoring or switching to a DOAC, and drugs (antiplatelets, NSAIDs) or alcohol use can be discontinued or reduced.

Is HAS-BLED used for patients on DOACs as well as warfarin?

Yes. Although HAS-BLED was originally derived in patients on warfarin, it is widely applied to all patients with atrial fibrillation being considered for anticoagulation, including those on direct oral anticoagulants (DOACs) such as rivaroxaban, apixaban, and dabigatran.

How does HAS-BLED differ from other bleeding risk scores?

Other scores like ORBIT and ATRIA are also used for AF-related bleeding risk, but HAS-BLED is the most widely validated and guideline-endorsed. ORBIT specifically focuses on factors predictive of major bleeding on anticoagulation and may outperform HAS-BLED in some populations. Clinical context should guide which score is used.

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