This investigation is being pioneered at a laboratory in London. Brilliant in its simplicity, it is a test to assess the permeability of the intestine and is particularly important in establishing leaky gut syndrome , which may be responsible for food allergy that can lead to so many disorders.
A patient passes the first morning urine and follows this by drinking a solution that contains a range of molecules of different sizes. Depending upon the gut permeability, these molecules are absorbed into the bloodstream. The kidney will filter these and a collection of urine can be assayed to measure the size of the molecules that were absorbed. If larger molecules are found then a leaky gut can be diagnosed and curative treatment obtained.
At this time the availability of this test is limited, but access to it is being increased and I believe this will be one of the most important tests available.