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During the test, you may be alone in the scanner room. But the technologist will watch you through a window. You will be able to talk with the technologist through a two-way intercom.

If contrast material is needed, the technologist will put it in an IV in your arm or hand. The material may be given over 1 to 2 minutes. Then more MRI scans are done. An MRI test usually takes 30 to 60 minutes but can take as long as 2 hours.

You won't have pain from the magnetic field or radio waves used for the MRI test. The table you lie on may feel hard and the room may be cool. You may be tired or sore from lying in one position for a long time. If a contrast material is used, you may feel some coolness when it is put into your IV. There are no known harmful effects from the strong magnetic field used for MRI. But the magnet is very powerful. The magnet may affect pacemakers, artificial limbs, and other medical devices that contain iron.

The magnet will stop a watch that is close to the magnet. Any loose metal object has the risk of causing damage if it gets pulled toward the strong magnet. Metal parts in the eyes can damage the retina. If you may have metal fragments in the eye, an X-ray of the eyes may be done before the MRI. If metal is found, the MRI will not be done. Iron pigments in tattoos or tattooed eyeliner can cause skin or eye irritation. An MRI can cause a burn with some medicine patches.

Be sure to tell your health professional if you are wearing a patch. There is a slight risk of an allergic reaction if contrast material is used during the MRI. But most reactions are mild and can be treated using medicine. There also is a slight risk of an infection at the IV site. A dye contrast material that contains gadolinium may be used in this test.

Be sure to tell your doctor if:. Health Canada has safety warnings about gadolinium. But for most people, the benefit of its use in this test outweighs the risk.

If you breastfeed and are concerned about whether the dye used in this test is safe, talk to your doctor. Most experts believe that very little dye passes into breast milk and even less is passed on to the baby.

But if you prefer, you can store some of your breast milk ahead of time and use it for a day or two after the test.

The radiologist may discuss initial results of the MRI with you right after the test. Complete results are usually available for your doctor in 1 to 2 days. An MRI scan can sometimes find a problem in a tissue or an organ that is not seen by X-ray , ultrasound , or CT scan , even when the size and shape of the tissue or organ looks normal. No blockage is found in the tubes ureters that lead out of the kidneys.

No bleeding, abnormal collections of fluid, blockage in the flow of blood, or bulges in the blood vessels aneurysms are present. An organ is too large, too small, or in the wrong place. The MRI also may show areas of scarring or injury. Growths are found, such as tumours that could be either benign or cancerous. Signs of infection may be present. A bulge in the wall of a blood vessel aneurysm is present. Blockage in or narrowing of a blood vessel also may be found.

Blockage is present in the bile ducts. Reasons for the blockage may include a gallstone, tumour, infection, or inflammation. Blockage is present in the tubes leading from the kidneys ureters. Reasons for the blockage may include a kidney stone, tumour, infection, or inflammation. Reasons you may not be able to have the test or why the results may not be helpful include:.

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Order Referral Pads. Contact the Imaging Center. Why choose the S. Before Arriving for Your Procedure. You should not have anything to eat or drink for three hours before the exam start time. If you think you'll get this medicine, be sure to arrange a ride home. It may be unsafe for you to drive or get home on your own. The test usually takes 30 to 60 minutes but can take as long as 2 hours.

There are no known harmful effects from the strong magnetic field used for an MRI. But the magnet is very powerful. It may affect any metal implants or other medical devices you have. Contrast material that contains gadolinium may be used in this test. But for most people, the benefit of its use in this test outweighs the risk. Be sure to tell your doctor if you have kidney problems or are pregnant. There is a slight chance of an allergic reaction if contrast material is used during the test.

But most reactions are mild and can be treated using medicine. If you breastfeed and are concerned about whether the contrast material used in this test is safe, talk to your doctor. Most experts believe that very little dye passes into breast milk and even less is passed on to the baby. But if you are concerned, you can stop breastfeeding for up to 24 hours after the test. During this time, you can give your baby breast milk that you stored before the test. Don't use the breast milk you pump in the 24 hours after the test.

Throw it out. Follow-up care is a key part of your treatment and safety. Be sure to make and go to all appointments, and call your doctor or nurse call line if you are having problems. It's also a good idea to keep a list of the medicines you take. Ask your doctor when you can expect to have your test results.