Kohl’s GI Nutrition and Diagnostic Center

Hydrogen Breath Test

A hydrogen breath test measures the amount of hydrogen in the breath, and helps diagnose several digestive problems, including lactose (and other kinds of sugar) malabsorption, and bacterial overgrowth in the small bowel.

For this test it is important for your child to fast overnight. At the test, a drink will be provided with the sugar (lactose, for example) to be tested. Your child will then blow into a machine that will measure the hydrogen content in the exhaled breath.

Hydrogen levels will be elevated if the sugar is malabsorbed (or in certain other diseases). The test can take several hours to complete because multiple samples of breath are needed.

See about your child’s visit to help prepare your child for a hydrogen breath test.

This test is available at the following locations: CHOP’s Main Campus; and CHOP Care Network locations in Voorhees, NJExton, PA; King of Prussia, PA; and Springfield, PA.

Contact us

To learn more or request an appointment, call 215-590-3326.


Reviewed by:
Petar Mamula, MD
Date: May 2014

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