February 4, 2014

Computed Tomography (CT) scan using radiocontrast is one of the most common imaging modalities used in emergency departments today. Several studies and my own anecdotal experiences indicate that both physicians and patients believe that iodine allergies are linked to seafood allergies and that both are related to a disproportionate increased risk of "allergic" reactions to radiocontrast agents. To add further insult to injury, some hospitals have premedication protocols with steroids and antihistamines requiring up to 12 hours before CT scans with intravenous contrast can be performed. So what is the relationship of radiocontrast, iodine, and seafood allergies?
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