A 49-year-old member asked:
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Why hydrogen breath test positive for lactose intolerance?

1 doctor answer
Dr. Cindy Juster
35 years experience in Pediatrics
See below.: The patient is given lactose after an overnight fast, after which exhaled air samples are collected before and at 30-minute intervals for 3 hours to assess hydrogen gas concentrations. If the concentration increases a lot, it proves the diagnosis.
Answered on Jan 16, 2019
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