The inulin hydrogen breath test accurately reflects orocaecal transit time

Background  The lactose[13C]ureide breath test (13C‐LUBT) has been validated and established as a reliable, non‐invasive test for the assessment of orocaecal transit time (OCTT). More recently, small studies have demonstrated that inulin could be an alternative substrate for H2‐based breath testing of the small bowel transit (H2‐INBT). We compared the performance of the H2‐INBT with the 13C‐LUBT in an appropriate number of participants, determined by sample‐size calculation.

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