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Use this calculator to calculate HAS-BLED score and risk of major bleeding with anticoagulation in atrial fibrillation.

Hypertension (Systolic BP > 160 mmHg)
Abnormal Renal Function
Abnormal Liver Function
Previous Stroke
Prior Major Bleeding or Predisposition
Labile INR (<60% of time in therapeutic range)
Age >65 (Elderly)
Drugs Predisposing to Bleeding (Antiplatelet agents, NSAIDs)
Alcohol Use (>8 drinks/week)

About this calculator

The HAS-BLED score was derived from a real-world cohort of 3978 with AF and assesses the 1-year risk for major bleeding (intracranial, hospitalization, hemoglobin decrease > 2 g/L, and/or transfusion) associated with oral anticoagulation. Patients with a high risk of bleeding (HAS-BLED score >/= 3) should undergo regular clinical review following the initiation of oral anticoagulation.

“HAS-BLED” is an acronym for:

  • Hypertension
  • Abnormal Liver/Renal Function
  • Stroke History
  • Bleeding Predisposition
  • Labile INRs
  • Elderly” (Age > 65)
  • Drugs/Alcohol Usage

The HAS-BLED score can be used in conjunction with the CHA2DS2-VASc score to estimate risk of stroke in atrial fibrillation.


Pisters R, Lane DA, Nieuwlaat R, de Vos CB, Crijns HJ, Lip GY. A novel user-friendly score (HAS-BLED) to assess one-year risk of major bleeding in atrial fibrillation patients: The Euro Heart Survey. Chest. 2010 Mar 18


QxMD Cardiology contributing author: Dr. Jason Andrade, MD, FRCP(C)