Iodine from the contract can absolutely cause acute thyrotoxicosis called "thyroid storm" in some rare cases, which is why it is (theoretically) important to check TSH/fT4 levels before doing an iodine contrast CT scan.

But it's not an allergy, and is not a contraindication to perform a contrast CT. 

 👍 

 BTW, love your profile picture. 👊 

 Thank you, I forgot where I lifted it from haha. It symbolizes my own physical change in the last couple of years.