Reliable information concerning the risks of MRI scans may be found online at the Mayo Clinic or the FDA. Risks for patients undergoing an MRI generally include any metal in the body or pregnancy, notes Mayo Clinic. Artificial limbs, pacemakers or medical implants are important to mention before MRI testing.
MRI scans use a strong magnetic field, which is much safer than the radiation exposure of a CT scan, according to the FDA. With the contrast that is sometimes used during an MRI test, there is a slight possibility of an allergic reaction, or slight skin or eye irritation. Patients with kidney failure may be negatively affected by MRI testing.