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The drink (barium sulfate) is to coat your GI tract (stomach,small bowel, large bowel) to help differentiate between them and other organs. It will help distinguish any other possible abnormalities in the abdomen.

The dye enhances your venous and arterial (depending on the study) system. This will highlight mostly blood vessels outside and inside your organs.

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15y ago
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Q: Why would you get a drink plus dye for Cat Scan?
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