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