Has anyone had a CT without contrast that has provided a sufficiently readable result? My son has lost all function in his left kidney and a blockage is suspected, so his urologist has ordered a CT scan "without and with contrast". After learning the risks of contrast dye on the kidneys, it seems best to avoid the dye if at all possible. His GFR is currently 84, and has ranged between 70 and 90 over the past few years.
Thank you!