A Female Patient Has Been Prescribed Warfarin (Coumadin)in Addition to a Heparin

A female patient has been prescribed warfarin (Coumadin) in addition to a heparin infusion.What is the reason for her receiving two anticoagulants?

A) The oral and injection forms work synergistically.
B) The combination of heparin and an oral anticoagulant results in fewer adverse effects than heparin used alone.
C) Oral anticoagulants are used to reach an adequate level of anticoagulation when heparin alone is unable to do so.
D) When oral anticoagulants are prescribed, heparin is often used to initiate therapy until laboratory tests indicate an adequate therapeutic response.