What Is Renal Higher Than Average Readings?

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A renal venogram is a test to look at the veins in the kidney. It uses x-rays and a special dye (called contrast).

X-rays are a form of electromagnetic radiation like light, but of higher energy, so they can move through the body to form an image on film. Structures that are dense (such as bone) will appear white, air will be black, and other structures will be shades of gray.

Veins are not normally seen in an x-ray. That is why the special dye is needed. The dye highlights the...

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