Final answer:
The nurse should clarify the order with the healthcare provider as soon as possible.
Step-by-step explanation:
The nurse should take action (c) and clarify the order with the healthcare provider as soon as possible. When a client is receiving a continuous IV anticoagulant like heparin, it is important to monitor their blood coagulation levels before initiating an oral anticoagulant like warfarin. The nurse should check the client's INR (international normalized ratio) prior to beginning Coumadin to ensure that the client's blood is at an appropriate level of anticoagulation.