HAS-BLED summarizes selected bleeding-risk factors in people with atrial fibrillation.
HAS-BLED Calculator
Form
Results
0 Points
Table of Contents
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What is HAS-BLED?
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How to Use This Calculator
- Enter or select Hypertension, Abnormal renal fuction, Abnormal liver function, Stroke history, Bleeding. Complete any remaining fields required by your chosen method.
- Check the unit beside each measurement. For a percentage or rate, use the scale and time period stated in the form.
- Choose Calculate, then compare the output with the formula and example below. If you change a value or option, calculate again to update the result.
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Formula Used
Add the applicable hypertension, organ dysfunction, stroke, bleeding, INR, age, drug and alcohol points.
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Variables Explained
| Input | What it means |
|---|---|
| Hypertension | Indicate whether the stated blood-pressure treatment or history criterion is met. |
| Abnormal renal fuction | Use the observed finding or laboratory value for this criterion, following the definition shown in the form. |
| Abnormal liver function | Use the observed finding or laboratory value for this criterion, following the definition shown in the form. |
| Stroke history | Use the observed finding or laboratory value for this criterion, following the definition shown in the form. |
| Bleeding | Use the observed finding or laboratory value for this criterion, following the definition shown in the form. |
| Labile INR | Use the observed finding or laboratory value for this criterion, following the definition shown in the form. |
| Age ⩾ 65 years | Age in the time unit shown; most adult equations use completed years. |
| Alcohol use ⩾ 8 drinks per week | Use the observed finding or laboratory value for this criterion, following the definition shown in the form. |
| Drugs predisponing to bleeding | Use the observed finding or laboratory value for this criterion, following the definition shown in the form. |
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Worked Example
Hypertension, age above the stated threshold and a prior bleed contribute 3 points if each criterion is met.
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Why Use This Calculator?
Use the calculation to make the method and its inputs easier to check with a healthcare professional. Its meaning depends on the clinical setting and on whether the underlying method is appropriate for that person.
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Common Mistakes
- The score highlights factors to review; it is not by itself a reason to stop prescribed anticoagulation.
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Frequently Asked Questions
Is this result a diagnosis or treatment instruction?
No. It describes a calculation or score from the supplied information. A qualified clinician must check the measurements, the method’s applicability and the wider clinical picture.
Can I enter the units from any lab report?
Use the units specified in the form and select a conversion only where the page provides one. Different substances need different conversion factors; a mismatch can produce a plausible but incorrect result.
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Sources & References
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