Calculation Results
About This Calculator
Assess 1-year major bleeding risk in patients receiving oral anticoagulants for atrial fibrillation using the validated HAS-BLED clinical criteria.
Frequently Asked Questions
Does a high HAS-BLED score mean anticoagulation should be stopped?
No! Clinical guidelines explicitly state that a high HAS-BLED score (>= 3) should NEVER be used to withhold anticoagulation. Instead, it alerts clinicians to identify and correct modifiable bleeding risk factors (uncontrolled hypertension, concurrent NSAID use, excessive alcohol consumption).
What constitutes a major bleed in the HAS-BLED criteria?
A major bleed is defined as bleeding that causes a decrease in hemoglobin of >= 2 g/dL, requires a transfusion of >= 2 units of blood, or occurs in a critical anatomic site (intracranial, intraspinal, intraocular, retroperitoneal).
Why is concurrent NSAID use so hazardous with anticoagulants?
Over-the-counter NSAIDs (such as ibuprofen and naproxen) cause gastric mucosal erosion and inhibit platelet COX-1 function, multiplying gastrointestinal bleeding risk three- to five-fold when combined with blood thinners.
What does 'Labile INR' mean?
Labile INR refers to patients taking Warfarin who spend less than 60% of their time within the target therapeutic INR range (usually 2.0 to 3.0). Switching to a direct oral anticoagulant (DOAC) eliminates this risk.