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A 35-year-old female asked:

Lactulose breath test... at 90 minutes... reading was 30 ppm of hydrogen. is that considered positive for sibo?

1 doctor answer1 doctor weighed in
Dr. David Drewitz
Gastroenterology 28 years experience
Depends...: The absolute value makes no difference in interpreting a hbt. The amount of increase over baseline is what determines a positive from a negative test.
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Last updated Sep 12, 2019

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