What Is a Fasting Gastrin Blood Test?
A fasting gastrin blood test is frequently used to assist in diagnosing tumors that produce gastrin, called gastrinomas, and other conditions that lead to an increased amount of gastrin being produced by the stomach. This test may also be done as a follow-up to the removal of a gastrinoma.
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How Is It Done?
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A fasting gastrin level is drawn the same way as in any other blood test. Blood is taken from a vein in the arm using a needle and special tube to hold the specimen.
Preparation
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It is necessary to avoid drinking alcohol for at least 24 hours, and to fast for at least 12 hours, prior to having your blood drawn for this test to assure accurate results.
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Medications
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Check with your physician if you take any medications, as you may be instructed to stop taking some before the test.
Why Is It Done?
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If you suffer from abdominal pain or diarrhea, your physician may request this test to see if your body is producing too much gastrin.
Reasons for Elevated Levels
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As the body ages, the gastrin level it produces may rise. Elevated gastrin levels are also seen with long-term use of antacids or other drugs that inhibit stomach acid production.
Results
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Elevated levels of gastrin point toward some type of medical condition, and additional testing is typically required. Normal and low levels do not require follow-up.
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References
- Photo Credit Image by Fotolia.com, courtesy of Alan Shearer
