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Thanks for the question.
You need to have yourself tested for any allergy to the contrast medium before hand.This can be done by injecting a minute amount of contrast under the skin under medical supervision.
In addition you may need to be pre medicated with an anti allergic agent and a steroid to decrease any chances of allergic reaction if you are found not to be allergic to the contrast agent.
If you are allergic to contrast you have to avoid the contrast injection.Your doctor may consider to have you tested for another type of contrast agent.You need to tell your doc tor about your problem so that he can steps to ensure your safety.