Lactose intolerance breath test (lactose intolerance hydrogen breath test)
The hydrogen breath test is a simple and safe method used to diagnose lactose malabsorption, or impaired lactose absorption.
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How to prepare
The hydrogen breath test is a simple and safe method used to diagnose lactose malabsorption, or impaired lactose absorption. During the test, the patient drinks a solution containing a specific amount of lactose, and the amount of hydrogen in the breath is measured at set intervals. If lactose is not properly absorbed in the small intestine, it reaches the large intestine, where it is broken down by bacteria, producing hydrogen and other gases. These gases are absorbed into the bloodstream and exhaled, so elevated hydrogen levels in the breath indicate lactose malabsorption and possible lactose intolerance caused by a deficiency of the lactase enzyme. This test usually takes about 2–3 hours.
How should I prepare for the exam?
- You should avoid dairy products and high-fiber foods for 24 hours before the test.
- You must not take any medications (such as antibiotics or laxatives) for 24 hours before the test, as they may affect the results.
- You should refrain from eating for 12 hours before the test.
- You should avoid smoking and chewing gum for 2 hours before the test.
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