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How can a radioisotope gastric-emptying scan help diagnose gastroparesis?

A radioisotope gastric emptying scan may help diagnose gastroparesis (delayed gastric emptying). For a radioisotope gastric-emptying scan you will eat food that contains a radioisotope, a slightly radioactive substance that will show up on the scan. The dose of radiation from the radioisotope is small and not dangerous. After eating, you will lie under a machine that detects the radioisotope and shows an image of the food in the stomach and how quickly it leaves the stomach. Gastroparesis is diagnosed if more than half of the food remains in the stomach after two hours.

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