 The risk of bleeding can be estimated using the HAS-BLED scoring system. Each letter presents a risk factor for bleeding H - hypertension, A - abnormal liver or renal function, S - history of stroke, B - history of bleeding, L - labile INR, E - elderly patients, and D - drugs, alcohol consumption. Patients with HAS-BLED scores 3 are considered to be at high risk of bleeding. 