Learn More

Request an Appointment with an Orlando Health Physician

Lactose intolerance occurs in people who are unable to digest lactose, the sugar found in milk and certain dairy products. Nausea, cramps, bloating and diarrhea are common signs of the condition and may prompt our doctors to perform a breath test for hydrogen, a product of fermentation in the colon when lactose is not digested or absorbed.


After administering a fluid high in lactose, we will ask your child to blow into a machine that measures hydrogen. We will take your child’s breath samples every 15 to 20 minutes for up to three hours to determine how much hydrogen is produced as the stomach and colon digest the fluid. High levels point to lactose intolerance.