Is warfarin a blood thinner?

Yes: Coumadin (warfarin) is routinely used as a chronic blood thinner. It works by inhibiting several coagulation factors (factors ii, vii, ix, and x) as well as anticoagulating factors (proteins c and s). Patients are typically "bridged" to Coumadin with another blood thinner like heparin.

Not really: That is a public term for anticoagulants and some anti platelet agents. The blood clotting is interfered with by coumadin- warfarin and that is tested by inr blood testing to achieve therapy level. The blood is still blood- not anemic or "thinned".