Fecal Pellet Output
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A simple and noninvasive means of evaluating gastrointestinal function involves measuring fecal pellet output over a given time period(s). This can involve not only pellet counts but also measuring total wet weight, total dry weight and descriptive observations. In turn these measures can be used to calculate average weight / pellet and wet versus dry ratio which provides a measure of moisture content while also serving as a colonic transit test.
The study illustrated below shows how the inhibition of colonic motility by an opioid results in reduced fecal pellet output