Abstract
The aim of this study was to establish a method for evaluating gastrocecal transit time using a simple and noninvasive 13C breath-test system in conscious rats. After fasting, rats were orally administered lactose-[13C]ureide. 13CO2 level in the expired air was measured at appropriate intervals. It was confirmed that priming dose of lactose-ureide was necessary for determining gastrocecal transit time. The level of 13CO2 in the expired air increased in a lactose-[13C]ureide dose-dependent manner. The gastrocecal transit time determined with 30 mg/kg of lactose-[13C]ureide was 160+/-24.5 min. This method is expected to contribute to the further understanding of intestinal pathophysiology.
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