Nutrition
Lactose Hydrogen Breath Test Basics
Lactose hydrogen breath test basics use exhaled hydrogen after a lactose challenge to support diagnosis—prep rules and symptom history still matter.
Lactose hydrogen breath test basics measure exhaled hydrogen after a lactose drink—rising levels suggest colonic fermentation from poor lactose absorption. Prep matters: antibiotics, laxatives, and high-fiber days before the test can skew results.
The test supports diagnosis alongside symptom history; it does not replace trial of lactase or lactose-free dairy. Breath labs differ from food IgE blood panels.
Common questions
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Can you take a breath test while on probiotics?
Clinicians often ask you to pause antibiotics and sometimes probiotics per lab instructions—follow the sheet you receive because prep changes hydrogen readings.
Related terms
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