I wasn't aware they couldn't test for allergy, but I have been having various kinds of tests involving a contrast medium for the past 30-some years, including IVP scans (go to a urologist, you get an IVP), and cardiac catheterizations (which ended up with a triple bypass and an artificial aortic valve). I've had MRIs and CT scans without a dye, as well. I figure .001 is pretty good odds to beat, personally.

We all have allergies; mine seem mostly to be household dust and tree pollen.