Why npo before mri

Imaging Technology Screening Questions. The Length of Time Varies For some exams and procedures, nil per os starts an hour before the exam. Fasting and You The most important thing you can do to prepare for your medical imaging exam, operation or procedure is to follow your NPO instructions as closely as you can. The length of time varies: NPO can begin at midnight the night before an exam, or as little as an hour before. It depends on the specific procedure or exam you are having. Related Posts.

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The staff will also be able to watch you at all times through a glass window. You will be given earplugs to wear, but you will still be able to hear and talk with MRI staff through a microphone. Please notify the technologist if you have any problems during the MRI. A coil might be placed around the part of your body being scanned such as your head, knee or abdomen.

This coil is really a special radio receiver that improves the picture and is usually contained in hard white plastic. If the coil begins to become uncomfortable during the scan, tell the MRI technologist. At certain times you will hear thumping noises. These noises are caused by the changing magnetic fields. You will feel air moving as fans move the air within the tunnel.

You may have someone with you in the room if you wish. This may help if you start to feel anxious. You may also listen to music through headphones while in the scanner. If you are very claustrophobic, your doctor may give you a mild sedative, or your MRI may be scheduled with sedation. If so you will need to have someone drive you home after the test. The test is painless, though if your test requires gadolinium contrast this is applied in a vein through a needle.

The test is very safe. If you feel that you are having more pain or symptoms following the MRI, notify the technologist before leaving. After the MRI If you feel pain or any unusual symptom following the exam, contact your referring physician.