HAS-BLED Bleeding Risk Calculator

Calculate the HAS-BLED score to estimate the annual risk of major bleeding in patients on anticoagulation.

Uncontrolled hypertension (SBP >160 mmHg)

Renal disease (dialysis, transplant, Cr >2.26 mg/dL)

Liver disease (cirrhosis or bilirubin >2× + AST/ALT >3×)

Stroke history

Prior bleeding or predisposition to bleeding

Labile INR (unstable, high, or <60% time in therapeutic range)

Age >65 years

Antiplatelet agents or NSAIDs

Alcohol use (≥8 drinks/week)

How to Use the HAS-BLED Calculator

Select 'Yes' for each bleeding risk factor present.
Note: Drugs = antiplatelet agents or NSAIDs; Alcohol = ≥8 drinks/week.
Click 'Calculate' to see the score and annual bleeding risk.

Anwendungsfälle

•Estimating bleeding risk before starting anticoagulation.
•Identifying modifiable bleeding risk factors.
•Balancing stroke vs bleeding risk in AFib management.

Formel

HAS-BLED: Hypertension(1) + Renal disease(1) + Liver disease(1) + Stroke(1) + Bleeding(1) + Labile INR(1) + Age>65(1) + Drugs(1) + Alcohol(1). Max = 9.

Häufig gestellte Fragen

What is the HAS-BLED score?

HAS-BLED is a scoring system to estimate the 1-year risk of major bleeding in patients with atrial fibrillation on anticoagulation therapy. It helps balance bleeding risk against stroke prevention benefit.

How is HAS-BLED interpreted?

Score 0–1: Low risk (<1% annual major bleeding). Score 2: Moderate (~1.9%). Score ≥3: High (>3.74%) — consider correctable risk factors before prescribing anticoagulation.

Medical disclaimer

This calculator is for educational purposes only. It does not replace professional medical evaluation. Always consult a qualified healthcare provider for clinical decisions.