When diagnosing lactose intolerance,____ is measured in the breath following oral consumption of 50 g lactose.

Question

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Hydrogen is measured in the breath following oral consumption of lactose to diagnose lactose intolerance. This is because lactose intolerant individuals are unable to digest lactose properly, leading to the production of excess hydrogen gas in the colon. This gas is then absorbed into the bloodstream and exhaled through the breath. Methane and carbon dioxide may also be measured but are less specific to lactose intolerance. Sulfur is not typically measured in this diagnostic test.

When Diagnosing Lactose Intolerance,____ Is Measured in the Breath Following