The provider inserts a catheter in an artery at groin level and maneuvers the catheter so he can inject a dye into the second or higher order subdivisions of the main renal artery supplying a single kidney. The dye shows up on X–ray, allowing the provider to visualize the renal blood vessels. The provider performs this procedure as an investigation for any blockage, narrowing, or clots in the renal blood vessels.
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