Dye risk isn't short term. If you have damaged kidneys, it can do them in that's why doctor's don't permit use of dye to already failing organs. I agree with with mike206, more money is made from continuous dialysis than from a permanent fix. At least it seems that way.
Just reading blood tests for years as the patient's kidneys deteriorate doesn't make any sense. It does make dollars, though. By now, a safe dye should exist for a disease that's so common. It you can make a gun that works from a printer, surely you can invent a dye that doesn't delete the kidneys. I think all kidney disease patients should press their doctors for this invention. If we don't put the pressure on,
who will. Surely, not the dialysis company millionaires.