: Magnetic Resonance Angiography of the Renal Blood Vessels

: What Is a Renal MRA?

: Magnetic resonance angiography (MRA) is an imaging technique that uses a strong magnetic field, radio waves, and often a contrast dye to visualize blood vessels. When applied to the kidneys, it produces detailed pictures of the renal arteries and veins without the need for traditional catheter-based angiography.

: Why Might Your Doctor Order It?

: Your doctor may recommend a renal MRA if you have high blood pressure that is difficult to control, reduced kidney function, or symptoms suggesting narrowed kidney arteries. It can also help evaluate conditions such as renal artery stenosis, aneurysms, or vascular malformations, and may be used to plan or monitor treatment.

: How the Test Is Performed

: You will lie on a table that slides into the MRI scanner. A contrast agent may be injected into a vein in your arm to make the blood vessels easier to see. The scan is painless, though you may be asked to hold your breath briefly for some images. The procedure typically takes 30 to 60 minutes.

: What to Expect and How to Prepare

: You may be asked not to eat or drink for a few hours before the exam if contrast is used. Tell your care team about any implanted medical devices, metal in your body, allergies, or kidney problems, because some contrast agents require caution in people with reduced kidney function. Most people can go home and resume normal activities right after the scan.