HAS-BLED Calculator

Point score of bleeding-risk factors during anticoagulation

Uncontrolled hypertension (systolic BP >160 mmHg)

Abnormal renal function (dialysis / transplant / creatinine >200 µmol/L)

Abnormal liver function (cirrhosis, or bilirubin >2× normal)

Prior stroke

Bleeding history or predisposition

Labile INR (time in therapeutic range <60%)

Age > 65

Drugs predisposing to bleeding (antiplatelets / NSAIDs)

Alcohol use (≥8 units/week)

Equation & limitations

Equation: Score = hypertension 1 + abnormal renal 1 + abnormal liver 1 + stroke 1 + bleeding 1 + labile INR 1 + elderly (>65) 1 + drugs 1 + alcohol 1
Version: HAS-BLED (Pisters 2010)
Source: Pisters R, Lane DA, Nieuwlaat R, de Vos CB, Crijns HJ, Lip GY. A novel user-friendly score (HAS-BLED) to assess 1-year risk of major bleeding. Chest. 2010;138:1093–1100.
Appropriate in: Adults with atrial fibrillation being considered for anticoagulation.
Limitations: The score is one input to a shared clinician–patient decision; a high score alone must not be used to withhold anticoagulation.
Correctable factors (blood pressure, labile INR, alcohol, drug interactions) are the practical point of the score.
HAS-BLED was derived in AF populations; using it in other anticoagulated groups is an extrapolation.

For educational use. Results support, and do not replace, clinical judgement — check them against the patient and local guidelines.