The examination takes place on an empty stomach. During the two days preceding the test, it is asked not to eat certain foods (which may cause fermentation or may affect the results of the test).

On the day of the test, the medical staff will ask you to ingest a small amount of the sugar to be tested (lactose, fructose, lactulose, etc.), diluted in water, on an empty stomach.

Then, it is necessary to blow into a special nozzle every 20 to 30 minutes for approximately 4 hours, in order to measure the evolution of the quantity of hydrogen contained in the exhaled air.

During the examination, it is of course forbidden to eat.

If the level of expired hydrogen increases during the test, as digestion progresses, this is a sign that the tested sugar is poorly digested or that the fermentation bacteria are very active (overgrowth).

An exhaled hydrogen level greater than 20 ppm (parts per million) is considered abnormal, as is an increase of 10 ppm from the base level.

Depending on the results, a nutritional treatment or strategy will be offered to you.

In case of bacterial overgrowth, a ogun aporo le ti wa ni ogun.

Ni ọran ti 'Ailera ti latosi, for example, it will be advisable to reduce the intake of dairy products, or even to exclude them completely from the diet. A consultation with a specialized nutritionist can help you adapt.