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What are oral contrast materials for a computerized tomography (CT) scan?

Abdominal computerized tomography (CT) scans may require the administration of water, or oral contrast material. Oral contrast materials are barium or iodine based. Barium-based contrast material is a thick white flavored drink similar to a milkshake. Iodine-based contrast material is a concentrate that is mixed with water or juice. For optimal imaging, approximately 1 liter of oral contrast material should be consumed during the hour prior to your scan.

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