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It's a fluid which has barium in it - Barium is radioactive, and shows up on X-rays. The barium 'meal' (as it's also called) is used by doctors to observe the passages of fluid etc through the digestive tract.

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11y ago

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It is commonly used to diagnose the cause of difficulty in swallowing (dysphagia) and for detecting hiatal hernia.

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13y ago
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Q: What is barium swallow?
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