Cardiology · Hematology

ORBIT Bleeding Risk Score calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Age ≥75 years

Reduced blood count: hemoglobin <13 g/dL in men or <12 g/dL in women, hematocrit <40% in men or <36% in women, or history of anemia

History of bleeding

Estimated glomerular filtration rate <60 mL/min/1.73 m²

Concomitant antiplatelet therapy

Result

Complete all required inputs to calculate the score.

Formula inputs

Age ≥75 years
Reduced blood count: hemoglobin <13 g/dL in men or <12 g/dL in women, hematocrit <40% in men or <36% in women, or history of anemia
History of bleeding
Estimated glomerular filtration rate <60 mL/min/1.73 m²
Concomitant antiplatelet therapy

Primary source

O'Brien EC et al. The ORBIT bleeding score: a simple bedside score to assess bleeding risk in atrial fibrillation. Eur Heart J. DOI: 10.1093/eurheartj/ehv476. PMID: 26424865. Scope: adults with atrial fibrillation receiving oral anticoagulation. (2015)

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