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A 21-year-old male asked:

i want a cardiac ct scan but am scared of allergic reaction to the dye, i have mild asthma. can i request benadryl (diphenhydramine) or how can i get round this?

2 doctor answers10 doctors weighed in
Dr. Joseph Accurso
Radiology 29 years experience
Why Cardiac CT?: Why at 21 yo is a cardiac ct desired? Risk of adverse reaction to contrast is less than 1%, and serious adverse reaction is about 1-2 in 10, 000 injections.
Dr. Harry Zegel
Radiology 50 years experience
See answer: Talk to your dr. / radiologist about the appropriate pre- procedure allergic preparation. It usually involves pre-procedure oral steroids (if you are an asthmatic already on steroids this may be modified), possibly an oral antihistamine, and may be performed in a hospital center depending on the severity of your prior iodine sensitivity.

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Last updated Nov 24, 2013

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