An MRI scan is a painless and safe procedure. Whether the magnetic fields and radio waves used in MRI scans are harmful to humans has been extensively studied. There is no evidence of risk, which means MRI scans are among the safest medical procedures.   Some patients experience occasional tingling or flushing in the MRI scanner. These effects only last for a short time and disappear once the scan is complete.   If you have any concerns during the scan, you'll receive pinch alerts that can alert the radiologist.   An MRI scan may not be recommended for patients with certain implants or foreign objects. If you have metal in your body, you should let the person who referred you for the scan know about it. It can then be checked before scanning.   You are unlikely to receive scan results right away. The radiologist sends a report to the doctor who ordered the exam. They will discuss the results with you. Unless there is an emergency, it usually takes one to two weeks for the MRI scan results to be available.