The lactose-[13C]ureide test allows a non-invasive assessment of intestinal transit time. It is based on a similar principle to the hydrogen breath test. The lactose-[13C]ureide test involves ingesting lactose-[13C]ureide. Intestinal bacteria break down the lactose-[13C]ureide and 13CO2 is produced. This is then detected in the patient’s breath.
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