What is this test?
MRI of the renal arteries—also known as Magnetic Resonance Angiography (MRA) of the renal vessels—is a specialized imaging technique that focuses on the blood vessels supplying the kidneys. It uses strong magnetic fields and radiofrequency waves, often in combination with a gadolinium-based contrast agent, to generate highly detailed images of the renal arteries. This test is performed without exposing the patient to ionizing radiation and is particularly useful for detecting vascular abnormalities like narrowing (stenosis) or blockages that can lead to hypertension and kidney dysfunction.
What is it used for?

• Diagnosing renal artery stenosis, a significant and treatable cause of secondary hypertension
• Evaluating blood flow to the kidneys in patients with suspected renal ischemia
• Detecting congenital vascular anomalies or fibromuscular dysplasia
• Monitoring known renal artery disease progression or post-stenting follow-up
• Investigating unexplained kidney dysfunction potentially due to poor perfusion
• Assessing vascular malformations, aneurysms, or dissection in the renal vasculature

Who should get this test?

• Individuals with resistant or unexplained high blood pressure, particularly if it starts at a young age
• Patients with impaired kidney function of unknown cause
• Those with a bruit (vascular sound) over the abdomen on physical exam
• Individuals with recurrent flash pulmonary edema or disproportionate hypertension compared to kidney function
• People undergoing work-up for possible renal artery intervention or surgery

Preparation Required:

• Fasting for 4–6 hours prior to the procedure is generally recommended
• A recent kidney function test (creatinine/eGFR) is required to assess the safety of using gadolinium contrast
• Remove all metal-containing items, such as jewelry or hearing aids
• Inform your doctor and MRI team of any medical implants, metal fragments, or history of contrast allergy
• Hydration may be advised before and after the scan, especially in patients with borderline renal function

How is the procedure performed?
The patient lies flat in the MRI scanner while images are acquired. A small intravenous line (IV) is placed to inject a gadolinium-based contrast agent, which highlights the blood vessels. The contrast-enhanced MRA sequence is then performed, typically taking 30 to 60 minutes. The scanner makes rhythmic tapping or thumping sounds, and ear protection is provided. Remaining still is essential for high-quality images.
Risks & Safety:
This test is generally safe and non-invasive, with no radiation exposure. The contrast used (gadolinium) is well-tolerated by most, but very rare allergic reactions or complications in patients with severe kidney impairment (e.g., nephrogenic systemic fibrosis) may occur. Always disclose any renal disease, pregnancy, or metal implants to your doctor beforehand.
Results:
A radiologist specializing in vascular imaging will interpret the scan and provide a detailed report, assessing blood flow, vessel diameter, and any areas of narrowing, occlusion, aneurysm, or malformation. These findings help determine whether medical, interventional, or surgical treatment is needed. Your referring physician will discuss the results and next steps with you.
Short Statement:
A specialized MRI that examines the renal arteries — the vessels supplying blood to the kidneys — often used to detect narrowing, blockage, or vascular disease.
Call to Action:
Managing high blood pressure or kidney concerns? Schedule a Renal Artery MRI to investigate your vascular health in detail.