While preparing to administer a client's morning medications, the nurse notes the client is to receive heparin 5,000 units subcutaneously and has a new order for enoxaparin. What action should the nurse take?

A. Check the client's activated partial thromboplastin time (aPTT): While aPTT is used to monitor unfractionated heparin therapy, it does not address the potential issue of duplicate anticoagulation therapy. Relying solely on lab values could put the client at risk for serious bleeding. B. Hold both medications and clarify the order with the prescriber: Administering both heparin and enoxaparin without clarification can result in excessive anticoagulation and significant bleeding risk. Holding the medications and contacting the prescriber ensures safe medication administration and prevents potential adverse effects. C. Administer the injections in separate sites: Even if given in separate sites, administering both heparin and enoxaparin simultaneously could lead to additive anticoagulant effects and increase the risk of hemorrhage. Site separation does not mitigate systemic risks. D. Administer the enoxaparin and hold the heparin: Giving enoxaparin without clarifying the order for heparin could result in duplicate anticoagulation, increasing the potential for bleeding complications. Safe practice requires prescriber clarification before administration.