AF Anticoagulation Decision (CHA₂DS₂-VASc + HAS-BLED) — free guideline decision tool
Decide on anticoagulation in non-valvular atrial fibrillation by combining stroke risk (CHA₂DS₂-VASc) and bleeding risk (HAS-BLED). Instant, browser-side.
Open guideline tool →Guideline-based
Implements the decision logic from published clinical guidelines.
Runs in your browser
No installation. Enter the patient's values and get a guideline recommendation instantly.
Data stays local
Nothing is uploaded. Results are for licensed clinicians only.
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Age | 70 yr |
|---|---|
| Sex | Male |
| CHF / LV dysfunction | Yes |
| Hypertension (history) | Yes |
| Diabetes | Yes |
| Prior stroke / TIA / thromboembolism | Yes |
| Vascular disease (MI / PAD / aortic plaque) | Yes |
| Uncontrolled hypertension (SBP > 160) | Yes |
| Abnormal renal function (dialysis / transplant / Cr > 200 µmol/L) | Yes |
| Abnormal liver function (chronic liver disease / bilirubin > 2× or transaminase > 3×) | Yes |
| Bleeding history or predisposition | Yes |
| Labile INR (on warfarin) | Yes |
| Concomitant antiplatelet / NSAID | Yes |
| Alcohol excess (≥ 8 units/week) | Yes |
| Mechanical valve OR moderate-severe mitral stenosis | Yes |
→Anticoagulation decisionAnticoagulate
- CHA₂DS₂-VASc：7 points
- HAS-BLED：9 points (high)
- Recommendation class：I
| Age | 70 yr |
|---|---|
| Sex | Female |
| CHF / LV dysfunction | No |
| Hypertension (history) | No |
| Diabetes | No |
| Prior stroke / TIA / thromboembolism | No |
| Vascular disease (MI / PAD / aortic plaque) | No |
| Uncontrolled hypertension (SBP > 160) | No |
| Abnormal renal function (dialysis / transplant / Cr > 200 µmol/L) | No |
| Abnormal liver function (chronic liver disease / bilirubin > 2× or transaminase > 3×) | No |
| Bleeding history or predisposition | No |
| Labile INR (on warfarin) | No |
| Concomitant antiplatelet / NSAID | No |
| Alcohol excess (≥ 8 units/week) | No |
| Mechanical valve OR moderate-severe mitral stenosis | No |
→Anticoagulation decisionConsider anticoagulation
- CHA₂DS₂-VASc：2 points
- HAS-BLED：1 points (low)
- Recommendation class：IIa
Common questions
What is AF Anticoagulation Decision (CHA₂DS₂-VASc + HAS-BLED)?
Decide on anticoagulation in non-valvular atrial fibrillation by combining stroke risk (CHA₂DS₂-VASc) and bleeding risk (HAS-BLED). Instant, browser-side.
How is AF Anticoagulation Decision (CHA₂DS₂-VASc + HAS-BLED) calculated? What is the core formula?
CHA₂DS₂-VASc (CHF, hypertension, age ≥ 75 [2], diabetes, prior stroke/TIA [2], vascular disease, age 65–74, female) vs HAS-BLED (uncontrolled BP, abnormal renal/liver function, stroke, bleeding, labile INR, age > 65, drugs/alcohol).
When is AF Anticoagulation Decision (CHA₂DS₂-VASc + HAS-BLED) used?
Support the anticoagulation decision in non-valvular AF, including drug preference and bleeding-risk management.
What are the key clinical points for AF Anticoagulation Decision (CHA₂DS₂-VASc + HAS-BLED)?
Anticoagulate when the non-sex CHA₂DS₂-VASc score is ≥ 2 (Class I); consider it at 1. Prefer a DOAC over warfarin in non-valvular AF (Class I). A mechanical valve or moderate-severe mitral stenosis contraindicates DOACs — use warfarin. A high HAS-BLED score flags modifiable factors to correct — it is not by itself a contraindication to anticoagulation.
What are the limits and cautions when using AF Anticoagulation Decision (CHA₂DS₂-VASc + HAS-BLED)?
For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
How is AF Anticoagulation Decision (CHA₂DS₂-VASc + HAS-BLED) calculated in practice? Can you show a worked example?
Inputs: Age 70 yr, Sex Male, CHF / LV dysfunction Yes, Hypertension (history) Yes, Diabetes Yes, Prior stroke / TIA / thromboembolism Yes, Vascular disease (MI / PAD / aortic plaque) Yes, Uncontrolled hypertension (SBP > 160) Yes… → Result: Anticoagulation decision Anticoagulate（CHA₂DS₂-VASc: 7 points, HAS-BLED: 9 points (high), Recommendation class: I） Inputs: Age 70 yr, Sex Female, CHF / LV dysfunction No, Hypertension (history) No, Diabetes No, Prior stroke / TIA / thromboembolism No, Vascular disease (MI / PAD / aortic plaque) No, Uncontrolled hypertension (SBP > 160) No… → Result: Anticoagulation decision Consider anticoagulation（CHA₂DS₂-VASc: 2 points, HAS-BLED: 1 points (low), Recommendation class: IIa）
Run AF Anticoagulation Decision (CHA₂DS₂-VASc + HAS-BLED) now
Decide on anticoagulation in non-valvular atrial fibrillation by combining stroke risk (CHA₂DS₂-VASc) and bleeding risk (HAS-BLED). Instant, browser-side.
Open guideline tool →For licensed clinicians. Not a substitute for clinical judgement.
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