Final answer:
Patients with a prior allergic reaction to iodinated contrast media may need to take steroids and antihistamines before a contrast-enhanced CT examination to prevent an allergic reaction.
Step-by-step explanation:
For a patient with a prior allergic reaction to iodinated contrast media, the preparation for a contrast-enhanced CT examination may include premedication with steroids and antihistamines. This is done to minimize the risk of an allergic reaction during the examination. By taking these medications beforehand, the patient's immune system may be better equipped to handle the contrast media and reduce the likelihood of an allergic response.