Performance of 13C Mannitol for in Vivo Measurement of Small Intestinal Permeability


About this study

The investigators' overall objective with this study is to determine performance characteristics of small intestine permeability measurement using 13C mannitol and 12C (regular) mannitol.

Participation eligibility

Participant eligibility includes age, gender, type and stage of disease, and previous treatments or health concerns. Guidelines differ from study to study, and identify who can or cannot participate. There is no guarantee that every individual who qualifies and wants to participate in a trial will be enrolled. Contact the study team to discuss study eligibility and potential participation.

Healthy Volunteers

Inclusion Criteria:

  • Age (yr) 18 to 65
  • No abdominal surgery (except appendectomy and cholecystectomy, others may be considered)

Exclusion Criteria:

  • History of irritable bowel syndrome (IBS), inflammatory bowel disease (IBD) (Crohn's disease or ulcerative colitis), microscopic colitis or celiac disease.
  • Use of tobacco products within the past 6 months (since nicotine may affect intestinal permeability)
  • Use of nonsteroidal anti-inflammatory drugs (NSAIDs) or aspirin within seven days of first permeability test (as NSAIDs affect intestinal permeability) and second permeability test (except those administered for the study)
  • Use of oral corticosteroids within the previous 6 weeks
  • Ingestion of artificial sweeteners such as Splenda® (sucralose), NutraSweet® (aspartame), lactulose or mannitol within two (2) days of each permeability test and endoscopy procedure date, e.g., foods to be avoided are sugarless gums or mints and diet soda
  • Ingestion of any prescription, over the counter, or herbal medications which can affect gastrointestinal transit within 7 days each permeability test and endoscopy procedure date. This includes drugs such as serotonin (5-HT) agents, narcotics, anticholinergics, anti-nausea medications, any medications for diarrhea or constipation.
  • Antibiotics within 7 days each permeability test and endoscopy procedure date
  • Bleeding disorders or medications that increase risk of bleeding from mucosal biopsies.
  • Score > 8 for anxiety or depression on Hospital Anxiety and Depression scale.
  • Pregnancy

Participating Mayo Clinic locations

Study statuses change often. Please contact the study team for the most up-to-date information regarding possible participation.

Mayo Clinic Location Status

Rochester, Minn.

Mayo Clinic principal investigator

Madhusudan Grover, M.B.B.S.

Closed for enrollment

More information


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