Gastric Emptying Scan

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A gastric emptying scan (GES) is a nuclear medicine exam using a radioactive material in a meal that allows doctors to identify abnormalities related to emptying of the stomach.

What is a gastric emptying scan?

A gastric emptying scan (GES) is a nuclear medicine exam using a radioactive material in a meal that allows doctors to identify abnormalities related to emptying of the stomach. Diseases that involve changes in the way the stomach contracts (motility disorders) are best diagnosed by this test. It is a form of radiology, because radiation is used to capture pictures of the human body.

How does the scan work?

Pictures are taken over time of the movement of a radioactive meal through your stomach. The gamma camera detects the gamma rays emitting from the radioactive meal and then produces pictures and measurements of the stomach.

How should I prepare for the scan?

• The only preparation involved is to fast 8 hours before the test.
• If you are diabetic, drink a 5-ounce glass of orange juice about 2 hours before your exam.
• The exam should not be performed on pregnant women, but is otherwise quite safe.
• Since eggs are usually used to hold the radioactive material, patients should notify their doctor if they are allergic to eggs. If needed, other foods can be used.

How is the scan performed?

1. You will be given a fried egg sandwich that has been injected with a small dose of radioactive material. You will be asked to eat the egg sandwich and drink water within 5 minutes. The egg will not taste any different than a non-radioactive egg.
2. After eating this meal, pictures of your stomach will be taken. The imaging involves lying flat on your back while the camera takes pictures of your stomach for 90 minutes. The technologist will help make you comfortable. You must not move during the time the camera is taking pictures. If you move, the pictures will be blurry and may have to be repeated.
3. The radioactive meal emits gamma rays. The gamma camera detects the rays. A computer will then produce pictures of the stomach based on the detected gamma rays.

What will I feel during the scan?

• Lying still on the exam table may be hard for some patients.

Who interprets the results and how do I get them?

When the test is over, the nuclear medicine doctor will review your images, prepare a written report, and discuss the results with your doctor. Your doctor will then talk with you about the results and discuss your treatment options.