ORBIT Bleeding Score
ORBIT bleeding-risk score (O'Brien 2015): low hemoglobin/hematocrit (2), age > 74 (1), bleeding history (2), renal insufficiency (1), antiplatelet therapy (1); 0-2 low, 3 intermediate, 4-7 high annual major-bleed risk.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Low Hb / Hct
- Yes
- Age > 74 years
- Yes
- Bleeding history
- Yes
- Renal insufficiency (eGFR < 60)
- No
- Antiplatelet treatment
- No
Result: ORBIT 5 of 7: high annual major-bleed risk 8.1% per O'Brien 2015 Table 3 (4-7 band).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- 0-2
- Low annual major-bleed risk 2.4%/yr per O'Brien 2015 Table 3.
- 3
- Intermediate annual major-bleed risk 4.7%/yr per O'Brien 2015 Table 3.
- 4-7
- High annual major-bleed risk 8.1%/yr per O'Brien 2015 Table 3.
What you enter
- Low Hb / Hct (2)
- Age > 74 years (1)
- Bleeding history (2)
- Renal insufficiency (eGFR < 60) (1)
- Antiplatelet treatment (1)
How this is calculated
O'Brien EC, Simon DN, Thomas LE, et al. The ORBIT bleeding score: a simple bedside score to assess bleeding risk in atrial fibrillation. Eur Heart J. 2015;36(46):3258-3264. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.