- History of coagulopathy, bleeding diathesis, therapeutic anticoagulation other than low dose or chronic ASA greater than or equal to 325 mg per day. Low dose coumadin for anticoagulation of venous access device or low dose molecular weight heparin (LMWH)for deep vein thrombosis prophylaxis or low dose (325 mg or less) ASA prophylaxis are allowed, but are best avoided if the treating physician feels it is safe to do so.