Thank you so much for letting me know about your experiences. This is all very good information to have when speaking with the anesthesiologist before the procedure.

I don't know what we'd do without this board. You all are my " go to" whenever I need reliable answers.

Thanks again!

DS is allergic to milk, eggs, peanuts and salmon.  He did fine with the contrast for a CT.  There was a sedative they couldn't use (I think due to the egg allergy) but he ended up not needing a sedative at all anyway.  I know that doesn't exactly answer your question, but I thought I'd chime in just in case there's something useful in there.

Contrast dyes have historically been contraindicated for people with a shellfish allergy, but that's not the real issue. The issue, from what I've seen is really that it has a high histamine level in general. I will say that I had a five day reaction to it that was not immediate. I had full body hives that arrived after I left the facility, though I did feel spacey once it hit me during the procedure (one of my reactions). I will say that my shellfish reactuons do happen two hours later.

So--I don't know if it was a histamine reaponse or shellfish. But I assume it was the former. I have heard that people with a history of problems can take a prophylactic dose of something beforehand. I'm not sure if that is an antihistamine or pred. 

When DS was little, there was an anesthesia (somewhat less sedating if I remember correctly) he couldn't have because of egg and soy allergy.  That was about 15 years ago, so I can't remember the name.  It would have been the anesthesiologist's first choice, but he was able to use something else instead.

ETA:  Just Googled and I'm assuming it was propofol he couldn't use.  http://www.ucdmc.ucdavis.edu/anesthesiology/images/residents/WARC_2011/Heather_WARC_web.pdf   

Does anyone know of any issues with contrast, anesthesia and/or Xanax/Ativan used during pediatric MRIs?

My DS allergies are to peanut, tree nut, legume, and sesame.

Any help will be greatly appreciated.