Gastrin

What Affects the Test

Reasons you may not be able to have the test or why the results may not be helpful include:

• Eating a high-protein food right before the test.
• Drinking caffeinated beverages or alcohol right before the test.
• Taking medicines or supplements that contain calcium.
• Taking medicines that control stomach acid, such as Pepcid, Zantac, or Prilosec.
• Taking anticholinergic medicines and some medicines used to treat depression (tricyclic antidepressants).
• Using medicines that contain atropine (such as Urised, Motofen, or Lomotil).
• Having abnormally low blood sugar (hypoglycemia).
• Having had stomach ulcer surgery or a small bowel resection. Increased gastrin levels also occur in medical conditions such as kidney failure, rheumatoid arthritis, and cirrhosis.

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Author:	Monica Rhodes	Last Updated: April 11, 2008
Medical Review:	Kathleen Romito, MD - Family Medicine Peter J. Kahrilas, MD - Gastroenterology
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