The renal arteries provide blood flow to the kidneys.
Renal artery disease, including narrowing (stenosis) can result in reduced blood-flow to the kidney. This can cause hypertension (high blood pressure). Renal artery stenosis is the most common correctable cause of hypertension.
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Blood flow velocities and flow patterns in the aorta and renal arteries are evaluated with ultrasound. Ultrasound of the kidneys can provide information about damage to the kidneys from long-standing inadequate blood flow.
Evaluation by a vascular surgeon will generally be recommended if there is a renal artery narrowing of 60 percent or more. Further evaluation or treatment may be recommended.