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. Also try the calculate Wells Score (PE).

Disclaimer: This tool is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making any health-related decisions.

H — Uncontrolled Hypertension (SBP > 160 mmHg) *

Uncontrolled systolic blood pressure > 160 mmHg

A — Renal Disease *

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

A — Liver Disease *

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

S — Stroke History *

Prior history of stroke, particularly lacunar infarct

B — Bleeding History or Predisposition *

Prior major bleeding or anemia/thrombocytopenia

L — Labile INR *

Unstable/high INR or TTR < 60% on warfarin

E — Elderly (Age ≥ 65) *

Patient is 65 years of age or older

D — Antiplatelet Drugs or NSAIDs *

Concomitant use of antiplatelet agents or NSAIDs

D — Alcohol Use (≥ 8 drinks/week) *

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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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. See also our MCA Calculator (Middle Cerebral Artery).

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). You might also find our calculate HAS-BLED Score, Bleeding Risk Category & Estimated Bleeds per 100 Patient-Years — HAS-BLED useful.

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.