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Calcimator

HAS-BLED Score Calculator

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

Inputs

Results

HAS-BLED Score

0/ 9

Annual Bleeding Risk

1.13%

High Bleeding Risk (≥3)0(0=No, 1=Yes)
How to Use This Calculator
  1. Enter 0 or 1 for each HAS-BLED criterion: uncontrolled hypertension, abnormal renal/liver function, prior stroke, bleeding history, labile INR, elderly (> 65), and drugs/alcohol.
  2. Review HAS-BLED Score — ≥ 3 indicates high bleeding risk requiring caution with anticoagulation.
  3. Use to prompt modifiable risk factor correction, not to withhold anticoagulation when indicated.

What each input means

Hypertension (Uncontrolled, >160 mmHg)
Uncontrolled systolic BP >160 mmHg (+1 point).
Abnormal Renal Function
Dialysis, transplant, Cr >2.26 mg/dL, or eGFR <30 (+1 point).
Abnormal Liver Function
Cirrhosis, or bilirubin >2x + AST/ALT/ALP >3x upper normal (+1 point).
Prior Stroke
History of stroke (+1 point).
Prior Bleeding
Major bleeding history or predisposition (e.g., anemia) (+1 point).
Labile INR
Unstable/high INRs, time in therapeutic range <60% (+1 point).
Elderly (Age >65)
Age greater than 65 years (+1 point).
Drugs (Antiplatelet/NSAIDs)
Concomitant use of antiplatelets or NSAIDs (+1 point).
Alcohol Excess
8 or more drinks per week (+1 point).

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Hypertension (Uncontrolled, >160 mmHg) = 0, Abnormal Renal Function = 0, Abnormal Liver Function = 0, Prior Stroke = 0 = 9 input(s) provided
  2. Calculate HAS-BLED Score
    HAS-BLED Score
    0 = 0
  3. Calculate Annual Bleeding Risk
    Annual Bleeding Risk
    1.13 = 1.13%
  4. Calculate High Bleeding Risk
    High Bleeding Risk
    0 = 0

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