- Prothrombin time (PT) such that international normalized ratio (INR) is =< 1.5 x ULN (or an in-range INR, usually between 2 and 3, if a patient is on a stable dose of therapeutic warfarin) and a partial thromboplastin time (PTT) =< 1.5 times the upper limit of normal (heparin, Lovenox or alternative anticoagulants are acceptable); this corresponds to CTCAE version 3.0 grade 1 one or less (11/02/2009) (03/29/10)