The Consumer Education Project of Milk SA

How is lactose intolerance diagnosed?

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With the hydrogen breath test. Consult a registered dietitian or medical doctor to confirm the diagnosis.

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The most common method to diagnose lactose intolerance is the hydrogen breath test. If a person has difficulty digesting lactose, higher levels of hydrogen will be produced in the colon and can then be detected in the breath. The test results are also interpreted in relation to food challenges and the patient’s clinical history. Another diagnostic option is an elimination diet. These diagnostic tests should be conducted under medical supervision, such as by a registered dietitian.

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