A client has a prescription for heparin 1,000 units IV STAT. Several pre-filled syringes of low molecular weight heparin are available in the client's medication drawer. Which action should the nurse implement?

A) Request a prescription to change the route of administration and use the available heparin: Changing the route of administration without a prescription is not within the nurse's scope of practice and could lead to medication errors or adverse effects. It's essential to follow the prescribed route of administration to ensure patient safety. B) Calculate and administer the equivalent dose of the available low molecular weight heparin: Low molecular weight heparin (LMWH) has different dosing and potency compared to unfractionated heparin. Calculating an equivalent dose without a specific conversion ratio could result in under- or overdosing, leading to ineffective anticoagulation or increased risk of bleeding. C) Advise the pharmacy of the need to deliver a vial of heparin to the nursing unit immediately: This is the correct action. Since the prescription specifies unfractionated heparin administered intravenously, the nurse should notify the pharmacy to provide the correct medication promptly. Using a different form of heparin could lead to dosing errors or ineffective treatment. D) Dilute the available heparin in 250 mL of normal saline solution prior to IV administration: This action is not appropriate because it assumes that the available heparin is suitable for intravenous administration, which may not be the case. Dilution may also alter the concentration and potency of the medication, leading to inaccurate dosing and potential adverse effects.