. I do not want to have the gadolineum dye since I have read of the severe side effects. Can the MRCP be effective in diagnosis without the dye? If not, it is recommended that I have an ERCP - but what kind of dye is used with this? I am a severe asthmatic who was steroid dependent for 16 years - finally off. I have numerous allergies including egg and fish/seafood. Any information you provide woud be helpful. Thank you. PT