I have kidney disease 3B, and breast cancer. I've had numerous scans with dye contrast for the cancer but my oncologist tested the kidneys before each, and then my nephrologist had to agree that I could do it. In most cases, you can have an IV hydration before the dye is injected. It adds time, and get a blanket as "room-temperature" infusion can be chilling to the body. But I think worth it, as it protects the kidneys. The other alternatives mentioned here sound useful as well.