Final answer:
The emergency department nurse should call the Poison Control Center to best assist with a victim of poisoning, as it is equipped with resources and expertise specifically for such incidents.
Step-by-step explanation:
When an emergency department nurse admits a victim of poisoning, the best course of action is to call the Poison Control Center. The Poison Control Center is a specialized resource that provides valuable information and guidance on how to manage cases of poisoning, including the identification of the toxic substance, recommended treatments, and necessary precautions. By consulting with toxicologists and other experts at the Poison Control Center, the nurse can ensure that the victim receives the most appropriate and effective care.