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Sugar Permability Testing: The Lactulose/Rhamnose (L/R) Ratio

Specialty:

Gastroenterology
Endocrinology, Nutrition & Dermatology

Objective:

ICD-10:

Description:

The ratio of urine lactulose to urine L-rhamnose (L/R ratio) is a measure of intestinal permeability. Lactulose is a large molecule and normally very little is absorbed from the gut. Following a variety of insults the gut becomes more permeable, and lactulose may be absorbed into the blood from which it passes into the urine.

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