Before any magnetic resonance imaging treatment, it would be good to have urea and creatinine blood results, so that our doctors can evaluate whether they can give you IV contrast. In case of an emergency and you do not have urea and creatinine blood results; this could be done at the clinic. If you are a kidney patient, urea and creatinine blood results are compulsory. In case you are allergic to the IV contrast substance you have to share this information with our doctor or technologist.