About this calculator
HAS-BLED summarizes bleeding-risk factors in people with atrial fibrillation, especially when anticoagulation is being considered or reviewed. It is intended to highlight risk factors that may need attention, not to automatically deny anticoagulation.
HAS-BLED assigns 1 point each for hypertension, abnormal renal function, abnormal liver function, stroke, bleeding history/predisposition, labile INR, elderly age >65, drugs, and alcohol.
Source-mapped clinical score for education
HAS-BLED highlights bleeding-risk factors; it is not a reason by itself to withhold anticoagulation.
Formula and method
HAS-BLED = hypertension + abnormal renal function + abnormal liver function + stroke + bleeding history/predisposition + labile INR + elderly age >65 + drugs + alcohol. Maximum score: 9.
Limitations and when not to rely on this result
- HAS-BLED highlights bleeding-risk factors; it is not a reason by itself to withhold anticoagulation.
- Results should prompt review of modifiable risks such as blood pressure, renal/liver disease, interacting medicines, alcohol, and labile INR.
- Anticoagulation decisions require clinician judgment and the full clinical picture.
Frequently asked questions
What does HAS-BLED measure? +
It summarizes bleeding-risk factors in atrial fibrillation, particularly around anticoagulation decisions.
Is a high HAS-BLED score a reason to stop anticoagulation? +
Not by itself. A high score should prompt clinician review and correction of modifiable bleeding risks.
What score is considered high? +
A score of 3 or more is commonly treated as a higher-risk flag requiring caution and follow-up.
Does labile INR apply to DOACs? +
Labile INR is mainly relevant to warfarin or other vitamin K antagonist therapy.
Can I use HAS-BLED without atrial fibrillation? +
The original score was developed for atrial fibrillation populations, so use outside that context needs clinician judgment.