- The patient has an adequate coagulation function as defined by International Normalized Ratio (INR) =< 1.5 x upper limit of normal (ULN) or prothrombin time (PT) =< 1.5 x ULN, and partial thromboplastin time (PTT or aPTT) =< 1.5 x ULN (those receiving anticoagulation therapy except low molecular weight heparin are excluded)