HAS-BLED Bleeding Score Calculator
The HAS-BLED score estimates one-year major bleeding risk in people with atrial fibrillation who are taking, or being considered for, anticoagulation. It awards points for Hypertension, Abnormal renal or liver function, Stroke history, Bleeding history or predisposition, Labile INR, Elderly (over 65), and Drugs or alcohol use, for a maximum of 9. A high score highlights modifiable risks to correct and the need for closer monitoring, not an automatic reason to stop anticoagulation. Mark each factor present below. This is an educational tool, not a diagnosis or treatment decision.
HAS-BLED scoring
Score = H + renal + liver + S + B + L + E + drugs + alcohol
Each item present = 1 point; maximum total = 9
0 to 2 = lower risk; 3 or more = high risk
Renal/liver and drugs/alcohol are separate sub-items
The total is the sum of the present risk factors. Abnormal renal and liver function are scored separately, as are drugs and alcohol, so the maximum is 9 points.
HAS-BLED context
- Designed for atrial fibrillation patients on or considering anticoagulation.
- A score of 3 or more is considered high bleeding risk.
- High scores prompt correction of modifiable risks and closer review.
- It is not, by itself, a reason to withhold anticoagulation.
- Often weighed against a stroke-risk score such as CHA2DS2-VASc.
HAS-BLED score: frequently asked questions
What does HAS-BLED stand for?
HAS-BLED is an acronym for its risk factors: Hypertension, Abnormal renal or liver function, Stroke, Bleeding history or predisposition, Labile INR, Elderly (over 65), and Drugs or alcohol use. It estimates one-year major bleeding risk in people with atrial fibrillation on anticoagulation.
How is the score totaled?
Each factor scores 1 point, but abnormal renal/liver function and drugs/alcohol are each split into two sub-items that can score 1 point each, so the maximum total is 9. Higher scores indicate greater bleeding risk.
How is the HAS-BLED score interpreted?
A score of 0 to 2 is generally considered low to moderate bleeding risk, and 3 or more is considered high risk, prompting caution and closer review rather than automatic withholding of anticoagulation.
Does a high score mean anticoagulation should stop?
No. A high HAS-BLED score flags modifiable bleeding risks to address (such as blood pressure control) and the need for closer monitoring. It is not on its own a reason to withhold anticoagulation. That balance is a clinical decision.
Is this a diagnosis?
No. HAS-BLED is a risk-estimation tool. This calculator is educational and does not replace assessment by a clinician.
Official sources
- National Library of Medicine (NCBI): HAS-BLED bleeding risk literature.
- National Heart, Lung, and Blood Institute: Atrial fibrillation and anticoagulation.
Reviewed by the CalculatorHub team, edited by James Graham, 17 June 2026. See our methodology.