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You’ve probably heard about the test called magnetic resonance imaging or MRI. In this test, radio waves, a magnetic field, and a computer create a scan of your body parts to look for health problems.

Magnetic resonance angiography–also called a magnetic resonance angiogram or MRA–is a type of MRI that looks specifically at the body’s blood vessels. Unlike a traditional angiogram, which requires inserting a catheter into the body, magnetic resonance angiography is a far less invasive and less painful test.

During magnetic resonance angiography, you lie flat inside the magnetic resonance imaging scanner. This is a large, tunnel-like tube. In some cases, a special dye, known as contrast, may be added to your bloodstream to make your blood vessels easier to see. When needed, the contrast is given with an intravenous (IV) needle.

If your healthcare provider believes that you may have a narrowing or blockage of blood vessels somewhere in your body, he or she may recommend magnetic resonance angiography. Other conditions that your healthcare provider can look for during this test include:

If a dye is needed to make the blood vessels easier to see during the test, you may experience a bit of discomfort because of the insertion of the IV.

You might also experience some anxiety when placed inside the MRI scanner, which is a small, narrow space. If you think you might be claustrophobic, be sure to inform your healthcare provider of this in advance. You may be given a mild sedative to make being in the MRI scanner more bearable.

Some potential risks of magnetic resonance angiography include:

Pregnant women may have additional risks in the MRI scanner. Make sure to tell your healthcare provider if you are or might be pregnant.

You may be at risk for other complications, depending on your specific medical condition. Be sure to discuss any concerns with your healthcare provider before the test.

EAT/DRINK: You may eat, drink and take medications as usual.

CLOTHING: You must completely change into a patient gown and lock up all personal belongings. A gown and locker will be provided for you. Please remove all piercings and leave all jewelry and valuables at home.

WHAT TO EXPECT: Imaging takes place inside of a large tube-like structure, open on both ends. You must lie perfectly still for quality images. The machine is very loud, so earplugs are required and will be provided to you.

CONTRAST: Your exam may include an injection of a contrast agent. A contrast agent is a special liquid that is injected through an intravenous (IV) line, a small tube placed in a vein. Some people may notice discomfort, tingling or warmth in the lips, metallic taste in the mouth, tingling in the arm, nausea or headache. These symptoms go away quickly.

ALLERGY: If you've had an allergic reaction to contrast that required medical treatment, contact your ordering physician to obtain the recommended prescription to take by mouth 24, 12 and two hours prior to the exam.

ANXIETY: If you require anti-anxiety medication due to claustrophobia, contact your ordering physician for a prescription. Please note, you will need someone to drive you home.

STRONG MAGNETIC ENVIRONMENT: If you have metal within your body that was not disclosed prior to your appointment, your study may be delayed, rescheduled or cancelled upon your arrival until further information can be obtained.

Your doctor may suggest additional preparation depending on your particular situation.

Magnetic resonance angiography may be done on an outpatient basis or during a hospital stay. Generally, magnetic resonance angiography follows this process:

The scan typically causes no side effects or complications. If it is done on an outpatient basis, you are generally free to leave after the magnetic resonance angiography. Your healthcare provider will likely schedule a follow-up appointment to review the results of the test.

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