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Showing 1–24 of 163 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Gastric Bypass Surgery Clear all
Active, not recruiting Phase 4 Interventional

Bariatric Surgery vs. Semaglutide vs. Tirzepatide

NCT06803888
View directory record Official record
Conditions
Obesity and Obesity-related Medical Conditions
Interventions
Bariatric Surgery, Semaglutide, Tirzepatide
Procedure · Drug
Lead sponsor
Ali Aminian
Other
Eligibility
18 Years to 70 Years
Enrollment
140 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Sep 2, 2026 · Synced Sep 17, 2026, 11:45 PM EDT
Withdrawn Phase 1Phase 2 Interventional

The Effect of Obstructive Sleep Apnea on Medical Outcomes After Gastric Bypass Surgery

NCT00671983
View directory record Official record
Conditions
Obesity, Sleep Apnea, Obstructive
Interventions
Neurocognitive Testing
Procedure
Lead sponsor
Stanford University
Other
Eligibility
30 Years to 65 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2014
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Oct 17, 2016 · Synced Sep 17, 2026, 11:45 PM EDT
Completed No phase listed Observational

Relationship Between Changes in Gut Hormones After Gastric Bypass and Gastric Banding and Improvements in Diabetes

NCT01153438
View directory record Official record
Conditions
Type 2 Diabetes, Obesity, Bariatric Surgery
Interventions
Not listed
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years and older
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2013
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Aug 16, 2016 · Synced Sep 17, 2026, 11:45 PM EDT
Completed Not applicable Interventional

Mechanisms of Diabetes Relapse After Bariatric Surgery

NCT01516320
View directory record Official record
Conditions
Type 2 Diabetes
Interventions
Roux-en-Y Gastric Bypass, Laparoscopic adjustable gastric banding, Vertical Sleeve Gastrectomy
Procedure
Lead sponsor
Blandine Laferrere
Other
Eligibility
18 Years to 65 Years
Enrollment
56 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2014
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jan 31, 2017 · Synced Sep 17, 2026, 11:45 PM 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 17, 2026, 11:45 PM EDT
Completed Phase 4 Interventional

A Trial of the Cost Effectiveness of IV Acetaminophen in Bariatric Surgery

NCT02233400
View directory record Official record
Conditions
Hospital Costs, Length of Stay, Postoperative Pain Score, Patient Satisfaction
Interventions
Acetaminophen
Drug
Lead sponsor
St. Luke's Hospital and Health Network, Pennsylvania
Other
Eligibility
18 Years to 80 Years
Enrollment
113 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
2
States / cities
Allentown, Pennsylvania • Bethlehem, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 7, 2014 · Synced Sep 17, 2026, 11:45 PM 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 17, 2026, 11:45 PM 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 17, 2026, 11:45 PM EDT
Completed No phase listed Observational Results available

Effects of Gastric Bypass Surgery and Calcium Metabolism and the Skeleton

NCT01330914
View directory record Official record
Conditions
Obesity, Morbid, Gastric Bypass
Interventions
Not listed
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
25 Years to 70 Years
Enrollment
55 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Mar 14, 2019 · Synced Sep 17, 2026, 11:45 PM EDT
Completed No phase listed Observational

Roux-en-Y Gastric Bypass and Weight Regain

NCT02302898
View directory record Official record
Conditions
Obesity
Interventions
Eating Behavior Evaluation, Measurement of Functional gastric volume, Measurement of gastric pouch and GJ size
Behavioral · Other
Lead sponsor
Washington University School of Medicine
Other
Eligibility
21 Years to 60 Years
Enrollment
2 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Apr 8, 2018 · Synced Sep 17, 2026, 11:45 PM EDT
Completed No phase listed Observational

Laparoscopic Revision of Vertical Banded Gastroplasty to Gastric Bypass

NCT01041131
View directory record Official record
Conditions
Clinically Severe Obesity, Inadequate Weight Loss, Obesity Recidivism
Interventions
Not listed
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years to 65 Years
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009
U.S. locations
1
States / cities
Fresno, California
Source: ClinicalTrials.gov public record
Updated Dec 31, 2009 · Synced Sep 17, 2026, 11:45 PM EDT
Not listed No phase listed Observational Accepts healthy volunteers

Fat Taste Sensory Study

NCT03540693
View directory record Official record
Conditions
Bariatric Surgery Candidate, Bariatric Surgical Procedure
Interventions
RYGB, SG, LAGB
Procedure
Lead sponsor
University of Illinois at Urbana-Champaign
Other
Eligibility
18 Years to 64 Years
Enrollment
105 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2023
U.S. locations
1
States / cities
Urbana, Illinois
Source: ClinicalTrials.gov public record
Updated Apr 27, 2021 · Synced Sep 17, 2026, 11:45 PM EDT
Active, not recruiting No phase listed Observational

Long Term Outcomes of Bariatric Patients Treated With Surgery or Endoscopy

NCT03705416
View directory record Official record
Conditions
GERD, Obesity
Interventions
Endoscopy, Surgery
Procedure
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years to 75 Years
Enrollment
250 participants
Timeline
2019 – 2028
U.S. locations
6
States / cities
Baltimore, Maryland • New Hyde Park, New York • New York, New York + 3 more
Source: ClinicalTrials.gov public record
Updated Aug 20, 2026 · Synced Sep 17, 2026, 11:45 PM EDT
Withdrawn No phase listed Observational

Bariatric Surgery Outcomes

NCT01057784
View directory record Official record
Conditions
Morbid Obesity
Interventions
Bariatric surgery.
Procedure
Lead sponsor
University of California, Los Angeles
Other
Eligibility
Not listed
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2014
U.S. locations
2
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Dec 7, 2014 · Synced Sep 17, 2026, 11:45 PM EDT
Completed Not applicable Interventional Results available

Hepatic Effects of Gastric Bypass Surgery

NCT00701376
View directory record Official record
Conditions
Liver Diseases
Interventions
liver biopsy
Other
Lead sponsor
The Cleveland Clinic
Other
Eligibility
18 Years and older
Enrollment
106 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2014
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Jun 18, 2020 · Synced Sep 17, 2026, 11:45 PM 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 17, 2026, 11:45 PM EDT
Completed Not applicable Interventional Results available

Transcranial Magnetic Stimulation Effects on Pain Perception

NCT01861574
View directory record Official record
Conditions
Gastric Bypass Surgery Pain Management
Interventions
Real TMS 45 min, Sham TMS 45 min, Real TMS 4 Hours, Sham TMS 4 Hours
Device
Lead sponsor
Medical University of South Carolina
Other
Eligibility
18 Years to 60 Years
Enrollment
108 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2011
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Sep 26, 2018 · Synced Sep 17, 2026, 11:45 PM EDT
Completed Not applicable Interventional Results available

Evaluation of the Rapid Airway Management Positioner

NCT00581230
View directory record Official record
Conditions
Endotracheal Intubation, Rapid Airway Management Positioner
Interventions
Laryngoscopy with RAMP, Laryngoscopy without RAMP
Device
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
18 Years to 80 Years
Enrollment
51 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2008
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Sep 19, 2016 · Synced Sep 17, 2026, 11:45 PM EDT
Withdrawn Phase 4 Interventional

Changes in Oral Contraceptive Hormones After Gastric Bypass Surgery

NCT01941134
View directory record Official record
Conditions
Bariatric Surgery Candidate, Contraception
Interventions
ethinyl estradiol-levonorgestrel
Drug
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years to 40 Years · Female only
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2017
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 20, 2018 · Synced Sep 17, 2026, 11:45 PM EDT
Completed No phase listed Observational

Symptomatic, Biomechanical and Radiographic Outcomes in Knee Osteoarthritis Following Gastric Bypass Surgery

NCT00194051
View directory record Official record
Conditions
Obesity, Osteoarthritis
Interventions
gastric bypass surgery
Procedure
Lead sponsor
University Hospitals Cleveland Medical Center
Other
Eligibility
35 Years to 60 Years
Enrollment
35 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2006
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Aug 25, 2022 · Synced Sep 17, 2026, 11:45 PM EDT
Active, not recruiting No phase listed Observational

Intestinal Metabolic Reprogramming as a Key Mechanism of Gastric Bypass in Humans

NCT02710370
View directory record Official record
Conditions
Obesity, Diabetes Mellitus, Type 2, Endocrine System Diseases, Glucose Metabolism Disorders, Metabolic Diseases
Interventions
Not listed
Lead sponsor
University of Pittsburgh
Other
Eligibility
18 Years and older
Enrollment
46 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2028
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 10, 2026 · Synced Sep 17, 2026, 11:45 PM EDT
Recruiting Not applicable Interventional

Comparing Endoscopic Ultrasound vs Surgical Gastrojejunostomy for Management of GOO.

NCT06128018
View directory record Official record
Conditions
Malignant Gastric Outlet Obstruction
Interventions
Surgical gastrojejunostomy (S-GJ), EUS-guided gastrojejunostomy (EUS-GJ)
Procedure
Lead sponsor
AdventHealth
Other
Eligibility
18 Years and older
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
1
States / cities
Orlando, Florida
Source: ClinicalTrials.gov public record
Updated Sep 3, 2026 · Synced Sep 17, 2026, 11:45 PM EDT
Completed Not applicable Interventional Results available

Surgery or Lifestyle With Intensive Medical Management in the Treatment of Type 2 Diabetes

NCT01073020
View directory record Official record
Conditions
Type 2 Diabetes Mellitus, Obesity
Interventions
Allergan Adjustable Gastric Band Surgery, Intensive Medical Diabetes & Weight Management (Why WAIT) - Band Group, Roux-en-Y Gastric Bypass (RYGB) Surgery, Intensive Medical Diabetes & Weight Management (Why WAIT) - Bypass Group
Device · Other · Procedure
Lead sponsor
Joslin Diabetes Center
Other
Eligibility
21 Years to 65 Years
Enrollment
88 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2016
U.S. locations
2
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 27, 2021 · Synced Sep 17, 2026, 11:45 PM EDT
Completed No phase listed Observational

Bone Loss After Laparoscopic Roux-en-Y Gastric Bypass

NCT00975013
View directory record Official record
Conditions
Bone Loss, Bone Density, Gastric Bypass, Bariatric Surgery
Interventions
Not listed
Lead sponsor
Gundersen Lutheran Medical Foundation
Other
Eligibility
30 Years to 65 Years · Female only
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2009
U.S. locations
1
States / cities
La Crosse, Wisconsin
Source: ClinicalTrials.gov public record
Updated Sep 6, 2015 · Synced Sep 17, 2026, 11:45 PM EDT