Diseases

H2 breath test

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through H2 breath test (Hydrogen breath test) can diagnose various diseases of the intestine such as an intolerance of lactose or fructose (lactose or fructose intolerance). Read all about the H2 breath test - how it works, when to use it and what to watch out for in the H2 test.

ArtikelübersichtH2 breath test

  • What is an H2 breath test?
  • When do you perform a H2 breath test?
  • What do you do with an H2 breath test?
  • What are the risks of an H2 breath test?
  • What should I consider after an H2 breath test?

What is an H2 breath test?

The H2 breath test is mainly used to detect intolerance to certain carbohydrates. Particularly often it serves the diagnosis of lactose or fructose intolerance (lactose intolerance, fructose malabsorption).

In both cases, the respective sugar passes undigested from the small intestine into the large intestine. There it is decomposed by the bacteria of the intestinal flora, whereby among other things hydrogen (H2) develops - in the human metabolism, however, no H2 is produced. The hydrogen is absorbed into the blood very quickly and exhaled through the lungs.

This is where the H2 breath test comes in: If, after drinking, for example, a lactose- or fructose-containing solution increases the amount of hydrogen in the exhaled air, this indicates that the corresponding sugar could not be utilized in the small intestine and decomposes bacterially in the colon has been.

The test substance lactulose can also be used to measure the so-called orozecal transit time using the H2 breath test. Lactulose is not useful for the body, but is decomposed in the colon by the bacteria, which, like other carbohydrates H2, which is then measurable in the air. The time between oral ingestion of lactulose and the increase in H2 concentration is the respiratory air corresponds to the orozokklichen transit time of lactulose.

How to demonstrate fructose intolerance - why you have to blow in the fructose intolerance test as in the police control in a device and what is measured.Wieso one must blow the fructose intolerance test as in the police control in a device and what is measured.To the table of contents

When do you perform a H2 breath test?

An H2 breath test can be performed with different test substances for different reasons. First and foremost, it is used in the diagnosis of intolerance to certain carbohydrates (such as lactose, fructose, glucose, etc.). Most commonly used by carbohydrate intolerances such as lactose intolerance and fructose malabsorption:

Lactose intolerance and fructose malabsorption

People with lactose intolerance have only small amounts of the enzyme lactase, which normally splits lactose (milk sugar) in the small intestine into its components glucose and galactose. Undigested lactose then passes into the large intestine where it is bacterially decomposed under H2 formation.

In fructose intolerance (fructose malabsorption), the function of the so-called GLUT5 transporter in the small intestine is reduced. As a result, fructose is inadequately absorbed from the small intestine. The remainder is utilized in the large intestine of bacteria, whereby H2 again develops.

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