Hi there. I am new to this forum and just found the questions regarding MRI contrast media. Prior to becoming incapacitated with dysautonomia, I worked in medical imaging for 20 years. I realize this response is likely too late, but I'd like to add that the iodinated non-ionic contrast media used in CT and diagnostic Radiology is chemically different than the gadolinium contrast used in MRI imaging. GFR assessment of kidney function is calculated from the serum creatinine to determine if a patient's kidneys will be able to tolerate either contrast media. There are established recommendations for patients with known kidney disease (3rd stage or higher)who require imaging. Iodinated contrast media used in CT and Radiology can temporarily lower kidney clearance, and this can be an issue with patients on oral diabetic medications, such as glucophage. Gadolinium MR contrast is typically associated with fewer reactions than iodinated CT contrast, except for patients in known renal failure. As a sidenote: if one has an anaphylactic or anaphylactiod reaction to iodinated CT contrast media, there is a premedication protocol that can mitigate reactions to future CT contrast media injections.
