1-year risk of major bleeding on oral anticoagulation. Free to use.
HAS-BLED (HAS-BLED Score for Major Bleeding Risk) is a validated clinical instrument used to assess 1-year risk of major bleeding on oral anticoagulation. The instrument contains 9 items.
Source / attribution: Pisters R et al., Chest 2010
Like all screening or assessment instruments, HAS-BLED is a structured aid — not a diagnostic test in isolation. Results should be interpreted alongside history, examination, and clinical context. Where a score crosses an actionable threshold, the next step is typically a more detailed clinical evaluation rather than a definitive diagnosis.
Answer all 9 items below to see your HAS-BLED score and interpretation.
All scoring runs in your browser. No data is sent anywhere — close the tab and the answers are gone.
HAS-BLED uses weighted summation: each item carries a fixed weight that is added when the response indicates a positive finding.
Scoring notes: Educational use only. Not a substitute for clinical judgment.
The cutoffs below are drawn from the published validation literature. Always interpret in clinical context.
| Score range | Band | Interpretation |
|---|---|---|
| 0–2 | Low risk | Low bleeding risk. |
| 3–9 | High risk | Higher bleeding risk — review carefully. |
This is an illustrative walkthrough, not a real patient. Follow the same four steps with your own answers — or use the live calculator at the top of this page.
Mark each item Yes or No. Each "Yes" adds the item's weight; each "No" adds 0. The example below uses illustrative answers.
| # | Item | Example response | Score |
|---|---|---|---|
| 1 | Hypertension (uncontrolled, SBP > 160) | Yes | 1 |
| 2 | Abnormal renal function (Cr > 2.26 mg/dL or dialysis) | Yes | 1 |
| 3 | Abnormal liver function (cirrhosis, bilirubin > 2x ULN with AST/ALT > 3x ULN) | Yes | 1 |
| 4 | Prior stroke | Yes | 1 |
| 5 | Prior major bleeding or predisposition | No | 0 |
| 6 | Labile INR (TTR < 60%) | Yes | 1 |
| 7 | Elderly (age > 65) | No | 0 |
| 8 | Drugs predisposing to bleeding (antiplatelets, NSAIDs) | Yes | 1 |
| 9 | Alcohol use ≥ 8 drinks/week | No | 0 |
Add the weights from the items where you marked "Yes" (skip the "No" answers — they contribute 0).
1 + 1 + 1 + 1 + 0 + 1 + 0 + 1 + 0 = 6
Find the row in the interpretation table whose range contains your total:
Total = 6 falls between 3 and 9 → High risk
High risk. Caution and regular review of anticoagulation indicated.
A score is one input alongside history and examination. HAS-BLED supports clinical judgment — it does not replace it.
If HAS-BLED doesn't fit your context, related instruments in cardiology include:
| Scale | Measures | Items | Time |
|---|---|---|---|
| CHA2DS2-VASc | Annual stroke risk in non-valvular atrial fibrillation | 8 | — |
| HEART Score | 6-week MACE risk in ED patients with chest pain | 5 | — |
| NYHA Functional Class | Functional capacity in heart failure | 1 | — |
| APGAR Score | Rapid assessment of newborn at 1 and 5 min | 5 | — |
| ASA Physical Status | Pre-operative health status | 1 | — |
| CURB-65 | 30-day mortality in community-acquired pneumonia | 5 | — |
| Glasgow Coma Scale | Level of consciousness after head injury | 3 | — |
| Katz ADL | Functional independence in basic ADLs | 6 | — |
HAS-BLED (HAS-BLED Score for Major Bleeding Risk) is a validated instrument that assesses 1-year risk of major bleeding on oral anticoagulation.
HAS-BLED contains 9 items.
Scores of 3–9 fall in the "High risk" band. Higher bleeding risk — review carefully.
Scores of 0–2 fall in the "Low risk" band. Low bleeding risk.
Yes — HAS-BLED is in the public domain and free for clinical, educational, and research use without permission.
Pisters R et al. Chest. 2010;138(5):1093-1100.
No. HAS-BLED is a structured assessment aid. A score is one input alongside history, examination, and clinical context. Treatment decisions should never rest on a screening score alone.
HAS-BLED is supported by the following peer-reviewed sources: