Anaphylactic shock in 1987 from ivp dye for ct. now need ct w/ contrast. 1 dr says i can have it because dye is different. other dr says no. thoughts?

IV contrast allergy: There are two basic types of dye used: ionic high-osmolality contrast media (hocm) and non-ionic low-osmolality contrast media (locm). Locm has become the preferred form of IV dye in recent years, given its better safety record. If you had hocm before, you may be ok with locm. You need to figure out what you had before and then proceed with caution.