a test that measures the amount of hydrogen in the breath, and helps diagnose lactose intolerance. If the body is unable to digest lactose properly, it will make excess amounts of hydrogen.
A Hydrogen Breath Test (or HBT) is used as a clinical medical diagnosis for people with irritable bowel syndrome, and common food intolerances. The test is simple, non-invasive, and is performed after a short period of fasting (typically 8 hours).