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Showing 1–24 of 273 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Gastric bypass Clear all
Not listed No phase listed Observational

Microbiome and Bariatric Surgery

NCT03065426
View directory record Official record
Conditions
Weight Change, Body
Interventions
Not listed
Lead sponsor
North Dakota State University
Other
Eligibility
18 Years to 65 Years
Enrollment
144 participants
Timeline
2017 – 2021
U.S. locations
2
States / cities
Fargo, North Dakota • Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated May 15, 2017 · Synced Sep 3, 2026, 8:15 AM EDT
Recruiting Phase 4 Interventional

OPEN Versus InTact Capsule Proton Pump Inhibitors for the Treatment of Marginal Ulcers

NCT05799105
View directory record Official record
Conditions
Marginal Ulcer
Interventions
Omeprazole 40 milligrams
Drug
Lead sponsor
Stephen Firkins
Other
Eligibility
Not listed
Enrollment
122 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Mar 18, 2026 · Synced Sep 3, 2026, 8:15 AM EDT
Recruiting Not applicable Interventional

Gut Microbiome and Sex as Risk Factors for Kidney Stones After Bariatric Surgery

NCT04590690
View directory record Official record
Conditions
Bariatric Surgery Candidate
Interventions
Special diet
Other
Lead sponsor
University of Chicago
Other
Eligibility
18 Years to 130 Years
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2027
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 10, 2026 · Synced Sep 3, 2026, 8:15 AM EDT
Completed No phase listed Observational

Microenvironment of Adipose Tissue in Endocannabinoid System

NCT00978289
View directory record Official record
Conditions
Obesity
Interventions
Not listed
Lead sponsor
Vanderbilt University
Other
Eligibility
20 Years to 60 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2012
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jun 18, 2013 · Synced Sep 3, 2026, 8:15 AM EDT
Completed Not applicable Interventional

Changes in Gut Hormones, Body Composition and Energy Expenditure After Roux-en-Y

NCT02048501
View directory record Official record
Conditions
Obesity, Weight Loss
Interventions
Resting Metabolic Rate (RMR), Duel-energy x-ray absorptiometry (DEXA), Visual Analog Scale (VAS), Meal Stimulation Test
Other
Lead sponsor
Duke University
Other
Eligibility
18 Years to 65 Years
Enrollment
57 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2015
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Apr 25, 2017 · Synced Sep 3, 2026, 8:15 AM EDT
Completed No phase listed Observational

Study of Effects From Gastric Bypass Weight Loss on Brain Tissue

NCT00357344
View directory record Official record
Conditions
Weight Loss
Interventions
Not listed
Lead sponsor
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
NIH
Eligibility
18 Years to 45 Years
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
3
States / cities
Phoenix, Arizona • Scottsdale, Arizona
Source: ClinicalTrials.gov public record
Updated Jul 1, 2017 · Synced Sep 3, 2026, 8:15 AM EDT
Terminated Phase 4 Interventional Results available

Treatment of GLP-1 for Diabetic Bariatric Patients

NCT04624672
View directory record Official record
Conditions
Diabetes Mellitus, Type 2
Interventions
Semaglutide (1 Mg Dose), Placebo
Drug
Lead sponsor
Geisinger Clinic
Other
Eligibility
18 Years to 75 Years
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
Danville, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Nov 13, 2023 · Synced Sep 3, 2026, 8:15 AM EDT
Completed No phase listed Observational

Very Long Term Results After Laparoscopic Retrocolic Antegastric Gastric Bypass

NCT01040507
View directory record Official record
Conditions
Clinically Severe Obesity
Interventions
Not listed
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years to 65 Years
Enrollment
242 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009
U.S. locations
1
States / cities
Fresno, California
Source: ClinicalTrials.gov public record
Updated Dec 28, 2009 · Synced Sep 3, 2026, 8:15 AM EDT
Completed No phase listed Observational

Using Fitbit to Monitor Ambulation in Patients After Surgery.

NCT02741895
View directory record Official record
Conditions
General Surgery
Interventions
Fitbit monitoring
Behavioral
Lead sponsor
Cedars-Sinai Medical Center
Other
Eligibility
18 Years and older
Enrollment
135 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2017
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jan 29, 2018 · Synced Sep 3, 2026, 8:15 AM EDT
Enrolling by invitation Not applicable Interventional Accepts healthy volunteers

Biometabolic Outcomes After Weight Loss Surgery: An Individualized Approach

NCT04841057
View directory record Official record
Conditions
Obesity, Morbid, Metabolic Syndrome, NASH - Nonalcoholic Steatohepatitis
Interventions
50 cm BP limb length, 100 cm BP limb length, 150 cm BP limb length
Procedure
Lead sponsor
University of Missouri-Columbia
Other
Eligibility
18 Years to 80 Years
Enrollment
750 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2031
U.S. locations
1
States / cities
Columbia, Missouri
Source: ClinicalTrials.gov public record
Updated Jul 31, 2025 · Synced Sep 3, 2026, 8:15 AM EDT
Completed Not applicable Interventional

Iron Supplement to Improve Iron Status Following Bariatric Surgery

NCT02404012
View directory record Official record
Conditions
Anemia, Iron Deficiency
Interventions
Oral iron supplementation
Dietary Supplement
Lead sponsor
Indiana University
Other
Eligibility
18 Years to 65 Years · Female only
Enrollment
64 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2021
U.S. locations
1
States / cities
West Lafayette, Indiana
Source: ClinicalTrials.gov public record
Updated Aug 4, 2022 · Synced Sep 3, 2026, 8:15 AM EDT
Completed No phase listed Observational

Adding Malabsorption for Failed Gastric Bypass

NCT01040481
View directory record Official record
Conditions
Clinically Severe Obesity, Obesity Recidivism, Inadequate Initial Weight Loss, Poor Weight Loss, Persistent Obesity, Refractory Obesity, Intractable Obesity
Interventions
Not listed
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years to 65 Years
Enrollment
19 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009
U.S. locations
1
States / cities
Fresno, California
Source: ClinicalTrials.gov public record
Updated Dec 28, 2009 · Synced Sep 3, 2026, 8:15 AM EDT
Completed Early Phase 1 Interventional

Determinants of Diabetes Remission After Gastric Bypass Surgery

NCT02287285
View directory record Official record
Conditions
Type 2 Diabetes Mellitus
Interventions
Exendin9
Drug
Lead sponsor
Blandine Laferrere
Other
Eligibility
18 Years to 65 Years
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2019
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Apr 23, 2020 · Synced Sep 3, 2026, 8:15 AM EDT
Terminated No phase listed Observational

Long-Term Follow-up of Ohio State University Medical Center (OSUMC) Bariatric Patients

NCT00700843
View directory record Official record
Conditions
Obesity
Interventions
Not listed
Lead sponsor
Ohio State University
Other
Eligibility
18 Years to 89 Years
Enrollment
23 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2011
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated May 14, 2015 · Synced Sep 3, 2026, 8:15 AM EDT
Completed No phase listed Observational

Small Bowel Length and Bariatric Surgery Outcomes

NCT02872493
View directory record Official record
Conditions
Malnutrition, Obesity, Weight Loss, Micronutrient Deficiency
Interventions
Small bowel length measurement
Procedure
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years and older
Enrollment
470 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2025
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jul 7, 2025 · Synced Sep 3, 2026, 8:15 AM EDT
Completed Phase 2 Interventional Results available

Multi-Center Pre-Bariatric Weight Loss Study

NCT00469391
View directory record Official record
Conditions
Obesity
Interventions
GI Sleeve Implantable weight loss device (EndoBarrier), Sham Procedure
Device · Procedure
Lead sponsor
Morphic Medical Inc.
Industry
Eligibility
18 Years to 55 Years
Enrollment
56 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2008
U.S. locations
4
States / cities
Weston, Florida • Burlington, Massachusetts • Lebanon, New Hampshire + 1 more
Source: ClinicalTrials.gov public record
Updated Feb 14, 2017 · Synced Sep 3, 2026, 8:15 AM EDT
Completed No phase listed Observational

Endoscopic Therapy for Bleeding Marginal Ulcers After Gastric Bypass

NCT01040416
View directory record Official record
Conditions
Bleeding Marginal Ulcer
Interventions
Not listed
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years to 65 Years
Enrollment
45 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2009
U.S. locations
1
States / cities
Fresno, California
Source: ClinicalTrials.gov public record
Updated Dec 28, 2009 · Synced Sep 3, 2026, 8:15 AM EDT
Not listed No phase listed Observational Accepts healthy volunteers

Effects of Alcohol After Bariatric Surgery

NCT01843257
View directory record Official record
Conditions
Obesity
Interventions
Alcohol challenge test Alcohol visit first, Alcohol challenge test Placebo visit first
Other
Lead sponsor
University of Illinois at Urbana-Champaign
Other
Eligibility
21 Years to 65 Years · Female only
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2021
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Apr 26, 2021 · Synced Sep 3, 2026, 8:15 AM EDT
Not yet recruiting Not applicable Interventional

Transition to Ambulatory Bariatric Surgery (TABS) Trial

NCT07011628
View directory record Official record
Conditions
Obesity and Obesity-related Medical Conditions, Bariatric Surgery
Interventions
Same Day Discharge
Other
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
25 Years to 55 Years
Enrollment
200 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Aug 17, 2026 · Synced Sep 3, 2026, 8:15 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

A Cohort Study of Weight Loss and Gliosis

NCT03578887
View directory record Official record
Conditions
Obesity, Gliosis, Weight-Loss
Interventions
Behavioral Weight Loss Program, Roux-en-Y Gastric Bypass or Sleeve Gastrectomy
Behavioral · Procedure
Lead sponsor
University of Washington
Other
Eligibility
25 Years to 64 Years
Enrollment
112 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2025
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Sep 3, 2025 · Synced Sep 3, 2026, 8:15 AM EDT
Completed Not applicable Interventional Results available

Reinforcement of Surgical Staple Lines Using Peri-Strips Dry (PSD) With Veritas Collagen Matrix

NCT00566943
View directory record Official record
Conditions
Obesity
Interventions
PSD Veritas Collagen Matrix, Roux-en-Y gastric by-pass surgery with no buttress
Device · Procedure
Lead sponsor
Baxter Healthcare Corporation
Industry
Eligibility
18 Years and older
Enrollment
101 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
1
States / cities
Columbia, Missouri
Source: ClinicalTrials.gov public record
Updated May 18, 2017 · Synced Sep 3, 2026, 8:15 AM EDT
Completed No phase listed Observational

Internal Hernias After Laparoscopic Gastric Bypass

NCT01040364
View directory record Official record
Conditions
Internal Hernia, Mesocolic Hernia, Petersen´s Hernia, Jejunojejunostomy Hernia, Bowel Obstruction, Ischemic Bowel
Interventions
Not listed
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years to 65 Years
Enrollment
220 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009
U.S. locations
1
States / cities
Fresno, California
Source: ClinicalTrials.gov public record
Updated Sep 23, 2013 · Synced Sep 3, 2026, 8:15 AM EDT
Not listed Phase 3 Interventional

Randomized Controlled Trial of Laparoscopic Gastric Bypass Plus Omentectomy Versus Laparoscopic Gastric Bypass Alone in Improving Diabetic Indices

NCT00552942
View directory record Official record
Conditions
Diabetes, Interleukins, Cytokines
Interventions
laparoscopic gastric bypass plus omentectomy
Procedure
Lead sponsor
Legacy Health System
Other
Eligibility
18 Years and older
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Nov 1, 2007 · Synced Sep 3, 2026, 8:15 AM EDT
Completed Not applicable Interventional

Weight Loss-Independent Metabolic Effects of Roux-En-Y Gastric Bypass in Diabetes

NCT02207777
View directory record Official record
Conditions
Obesity, Type 2 Diabetes
Interventions
Roux-en-Y gastric bypass surgery, Low-calorie diet
Procedure · Behavioral
Lead sponsor
Washington University School of Medicine
Other
Eligibility
25 Years to 65 Years
Enrollment
65 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2019
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Jul 19, 2025 · Synced Sep 3, 2026, 8:15 AM EDT