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The gold standard test for lactose intolerance would be a Hydrogen Breath test. The individual would be required to fast for a number of hours prior to the test being done. They would then breathe into a specific apparatus which would measure their baseline hydrogen output in their expelled breath. They would then be given a high lactose liquid to drink and measurement for hydrogen would be done at intervals and ascertained as to whether or not they are digesting lactose efficiently or not.

Milk allergy and lactose intolerance are two very different issues related to the same food stuff. Milk allergy is generally an immune response to the protein found in milk which results in the immune system being stimulated and a reaction results such as an itch, rash, nausea, vomiting and breathing problems depending on the severity of the sensitivity and the number of times the person has been exposed. In general, an immune reaction gets more intense and more severe the more exposures. This type of reaction can be life threatening.

If your lactose intolerance is a Primary intolerance due to a genetic lactase mutation then the answer is no it can’t be cured. If however it is a transient lactase deficiency due to injury to the villi of the gut whether it be as a result of gut infection, antibiotic use or other, through means of gut repair and regeneration, the lactase production can be resumed resulting in a “cured” lactose intolerance.