Diagnosis at Mayo Clinic begins with:
- A physical exam that includes your doctor listening through a stethoscope for sounds that may mean the artery to your kidney is narrowed
- Questions about your medical and family history
- Blood tests to evaluate kidney function and exclude other conditions
Doctors who specialize in the interpretation of medical images (radiologists) conduct tests to check your blood vessels and kidneys. You may need one or more of the following imaging tests to find the narrowing in the renal artery and determine how severe it is:
- Doppler ultrasound. High-frequency sound waves help your doctor see the arteries and kidneys and check their function. This procedure also helps your doctor find blockages in the blood vessels.
- Computerized tomography (CT) scan. During a CT scan, an X-ray machine linked to a computer creates a detailed image that shows cross-sectional images of the renal arteries. You may receive a dye injection to show blood flow.
- Magnetic resonance angiography (MRA). MRA uses radio waves and strong magnetic fields to produce detailed 3-D images of the renal arteries and kidneys. A dye injection into the arteries outlines blood vessels during imaging.
- Specialized testing to evaluate oxygen delivery to the kidney. Blood oxygen level dependent (BOLD) magnetic resonance imaging evaluates how much oxygen your affected kidneys are receiving to determine whether restoring blood flow in your kidneys' arteries may be of benefit.
- Renal arteriography. This special type of X-ray exam helps your doctor check blood flow and find the blockage in the renal arteries. Before an X-ray is taken, your doctor injects a dye into the renal arteries through a long, thin tube (catheter) to outline the arteries and show blood flow more clearly. This is often performed at the time of restoring the blood vessel opening with a stent.
Read more about CT scan and ultrasound.
April 30, 2015
- Renal artery stenosis. National Kidney and Urologic Diseases Information Clearinghouse. http://kidney.niddk.nih.gov/kudiseases/pubs/RenalArteryStenosis/. Accessed March 5, 2015.
- Goldman L, et al. Vascular disorders of the kidney. In: Goldman's Cecil Medicine. 24th ed. Philadelphia, Pa.: Saunders Elsevier; 2012. http://www.clinicalkey.com. Accessed March 3, 2015.
- Ferri FF. Renal artery stenosis. In: Ferri's Clinical Advisor 2015: 5 Books in 1. Philadelphia, Pa.: Mosby Elsevier; 2015. https://www.clinicalkey.com. Accessed March 3, 2015.
- Taal MW, et al. Renovascular hypertension and ischemic nephropathy. In: Brenner & Rector's The Kidney. 9th ed. Philadelphia, Pa.: Saunders Elsevier; 2012. http://www.clinicalkey.com. Accessed March 5, 2015.
- Tafur-Soto JD, et al. Renal artery stenosis. Cardiology Clinics. 2015;33:59.
- Textor S. Treatment of unilateral atherosclerotic renal artery stenosis. http://www.uptodate.com/home. Accessed March 3, 2015.
- Textor S. Treatment of bilateral atherosclerotic renal artery stenosis or stenosis to a solitary functioning kidney. http://www.uptodate.com/home. March 3, 2015.
- AskMayoExpert. Renal artery angioplasty and stenting. Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2014.
- Cooper CJ, et al. Stenting and medical therapy for atherosclerotic renal-artery stenosis. New England Journal of Medicine. 2014;370:13.
- Weight management and blood pressure. American Heart Association. http://www.heart.org/HEARTORG/Conditions/HighBloodPressure/PreventionTreatmentofHighBloodPressure/Weight-Management-and-Blood-Pressure_UCM_301884_Article.jsp. Accessed April 7, 2015.
- Sheps SG (expert opinion). Mayo Clinic, Rochester, Minn. April 8, 2015.
- Textor SC (expert opinion). Mayo Clinic, Rochester, Minn. April 8, 2015.