An interventional study of gas chromatography and Stool analysis for detection of malabsorption in Gastric Bypass, Blind Loop Syndrome and Bacterial Overgrowth Syndrome, sponsored by Lille Catholic University. Completed at 2 sites in France. Open to participants aged 18 Years to 65 Years. Per ClinicalTrials.gov, last updated 2025-12-24.
Sponsored by Lille Catholic University · Not applicable, Interventional, and Diagnostic
The objective of this research is to determine the incidence of microbial overgrowth of the small intestine before and after a gastric bypass. For this purpose, the study is based on the analysis of the expired hydrogen H2 with gas chromatography before surgery and at 1, 3, 6, 12, 18 and 24 months.
11 studies on the registry are indexed under Blind Loop Syndrome; 4 are open to participants now.
This study's enrollment of 51 is close to the median of 48 across 10 interventional studies indexed under Blind Loop Syndrome.
Browse Blind Loop Syndrome studies →Lille Catholic University is the lead sponsor of 112 studies on the registry; 24 are open to participants now.
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Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.
BMI (body mass index)
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraindication
A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
gas chromatography and stool analysis for detection of malabsorption
Procedure: gas chromatography · Procedure: Stool analysis for detection of malabsorption
Changes in expired hydrogen H2 concentration
Measured by gas chromatography
Time frame: change at baseline et up to 24 months
Changes in digestive symptoms
Time frame: change at baseline et up to 24 months
Changes in intestinal transit
Characterisation of intestinal transit by measuring stool frequency
Time frame: change at baseline et up to 24 months
Changes in malabsorption
Detection of lipids, vitamins (A, B1, B9, B12, D, E), zinc, magnesium, phosphorus, serum iron and protein balance (albumin, prealbumin, CRP) in order to diagnosis the presence of malabsorption
Time frame: change at baseline et up to 24 months
Plan to share: No
Ran from May 2016 to primary completion in Oct 2022, 76 months.
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This study is completed, as verified in Dec 2025. You cannot join it, but the record below documents what was studied.
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