A nurse is caring for a client who is receiving a continuous IV infusion of heparin. Which of the following actions should the nurse take?

Administer 50,000 units of heparin by IV bolus every 12 hours.

Have vitamin K available on the nursing unit.

Use tubing specific for heparin sodium when administering the infusion.

Check the activated partial thromboplastin time (aPTT) every 6 hours.