Lactuloso/mannitol intestinal pasage test

Intestinal passage tests
Intestinal passage test are valuable in diagnosing diseases of the small intestine, malabsorption syndrome, especially celiac disease. For the measurement of intestinal passage you can you a lot of markers(monosaccharides, disaccharides,51Cr-EDTA, polyethyleneglycol – PEG) respectively - their combinations. In the Czech republic, the most used test is a lactulose/mannitol (LA/MA test), which can be combined with cellobiose or with sacahrosis. Lactulose is a marker of a paracellular absorption. E.g. during celiac disease the intercellular connection loosens and the space between cells widens and that increases the passage of lactulose. Mannitol is a marker of active transport trough a cell (enterocyte) and in celiac disease the absorption of mannitol lowers by the reduction of a active surface which happens because of an atrophy of the intestinal wall. LA/MA intestinal permeability test can be used in monitoring of a postop chemotherapy.

Lactulose/mannitol test
Can be given with D-xylose, this version of the test was developed by ÚKBD in Hradec Králové. Solution of 10 g of lactulose, 2 g of mannitol, 2 g of D-xylose and 11 g of glucose in 100 ml of distilled water is given orally to the patient. The hyperosmolarity 1500 mosm/l increases the sensitivity of the test. Patient must be fasting (12 hrs, normally trough the night) and after drinking the solution their urine must be collected for 5 hours. The analysis of each sacharide is made by using gas chromatography, the relative amount of each sacharide is measured against the given amount and the end LA/MA LA/XY permeability indexes are calculated. The average LA/MA index in a control group is 0,016 ± 0,008, LA/XY index is 0,013 ± 0,009. Some other studies advices to use wider combinations of the three substrates, e.g. by adding sucralose, which is stable while passing the large intestine, other studies recommend the combine test of passage and lactose LDI/SAT index.

Source

 * ws:Laktulózo/mannitolový test střevní propustnosti