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Stomach acid test

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Definition:

The stomach acid test is a test that measures the quantity and acidity of stomach contents.

Alternative Names:

Gastric acid secretion test

How the test is performed:

After a period of fasting, fluid is all that remains in the stomach. This fluid can be removed via a tube inserted through the esophagus (food pipe).

To test the ability of cells in the stomach to secrete acid, gastrin may be injected just under the skin, into a muscle, or into a vein. The stomach contents are then removed and analyzed.

Another test involves insulin-induced hypoglycemia . Enough insulin is given under the skin or through a vein to cause the blood sugar to decrease. This causes the vagus nerve to stimulate the release of gastrin. After a short time, the stomach contents are removed and analyzed.

How to prepare for the test:

You will be asked not to eat or drink for four to six hours before the test.

How the test will feel:

You may notice some discomfort or a gagging feeling as the tube is passed through your nose or mouth, and down your esophagus.

Why the test is performed:

This test may be used for a number of reasons:

• To test for the cause of ulcers
• To check if material is coming back up from the small intestine
• To evaluate the cause of malabsorption
• To check if anti-ulcer medications work
• To test the secretion of gastrin

• Review Date: 10/18/2006
• Reviewed By: Jenifer K. Lehrer, MD, Department of Gastroenterology, Frankford-Torresdale Hospital, Jefferson Health System, Philadelphia, PA.Review provided by VeriMed Healthcare Network.

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