Calculator Inputs
What this tool summarizes
- Standard nine-point HAS-BLED scoring structure
- Automatic age and blood-pressure checks
- Warfarin-sensitive labile INR handling
- On-page score summary, CSV, PDF, and chart output
For educational and clinician-supported use. It is not a standalone diagnosis or treatment decision.
Plotly Graph
The chart below shows how each criterion contributes to the total score.
Example Data Table
| Example Input | Value | Point Rule | Points |
|---|---|---|---|
| Age | 76 years | Age over 65 | 1 |
| Systolic blood pressure | 168 mmHg | Above 160 mmHg | 1 |
| Abnormal renal function | No | Unchecked | 0 |
| Abnormal liver function | No | Unchecked | 0 |
| Stroke history | Yes | Checked | 1 |
| Bleeding history | No | Unchecked | 0 |
| Warfarin / VKA with TTR | Yes, TTR 48% | TTR below 60% | 1 |
| Bleeding-risk drugs | Yes | Checked | 1 |
| Alcohol excess | No | Unchecked | 0 |
| Example Total Score | 5 / 9 | ||
Formula Used
Total HAS-BLED Score = Hypertension + Renal + Liver + Stroke + Bleeding + Labile INR + Elderly + Drugs + Alcohol
- Each active criterion adds 1 point.
- Abnormal renal function and abnormal liver function are scored separately.
- Drug exposure and alcohol excess are scored separately.
- Total score ranges from 0 to 9.
This page groups totals into low flag (0 to 1), moderate flag (2), and high flag (3 or more) so the output is easier to review at a glance.
How to Use This Calculator
- Enter age and systolic blood pressure.
- Select the current anticoagulant context.
- Add TTR or unstable INR details when warfarin or another VKA applies.
- Check each relevant clinical history item.
- Submit the form to view the score above the form.
- Review the criteria table, interpretation, modifiable flags, and chart.
- Use the CSV or PDF button when you need a downloadable record.
FAQs
1) What does the HAS-BLED score estimate?
It summarizes major bleeding risk factors commonly reviewed in atrial fibrillation patients receiving or being considered for anticoagulation. It is a structured risk flag, not a diagnosis.
2) Does a high score automatically mean anticoagulation should stop?
No. A higher score highlights the need for closer review and correction of reversible bleeding factors. It should be interpreted with overall stroke risk and clinical judgment.
3) Why are renal and liver function separated?
The score treats abnormal renal function and abnormal liver function as distinct contributors. A patient can receive one point for each when both are present.
4) When does the hypertension point apply?
This implementation adds the hypertension point when systolic blood pressure is above 160 mmHg. That matches the standard threshold used for the score.
5) How is labile INR handled here?
The labile INR point is triggered only in the warfarin or VKA context when TTR is below 60% or unstable INR is marked. That keeps the field more clinically specific.
6) Do drugs and alcohol each add a separate point?
Yes. Drugs that increase bleeding risk and excess alcohol are counted individually, so both together can add two points to the total.
7) Can this be used without patient age and blood pressure?
Those two entries are required here because age and systolic pressure directly affect the score. Missing them would make the output incomplete.
8) Is this calculator enough for treatment decisions?
No. It is best used as a structured review aid alongside medication assessment, stroke-risk evaluation, bleeding history, examination, and clinician judgment.