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Showing 1–24 of 275 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: gastric bypass Clear all
Completed Not applicable Interventional Results available

Pancreatic Enzymes to Restore Digestive Function in Malnourished Gastric Bypass Patients

NCT00510744
View directory record Official record
Conditions
Obesity
Interventions
pancreatic enzyme supplement
Drug
Lead sponsor
University of Pittsburgh
Other
Eligibility
18 Years to 65 Years
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2015
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 1, 2016 · Synced Sep 16, 2026, 3:59 PM EDT
Active, not recruiting No phase listed Observational

Biological Sample Repository for Gastrointestinal Disorders

NCT05874726
View directory record Official record
Conditions
Obesity, Obesity, Morbid, Obesity, Primary, Gastro-Intestinal Disorder, Overweight and Obesity, Overweight, Overweight or Obesity, Diabetes Type 2, Diabetes Mellitus, Diabetes Mellitus, Type 2, Hypertension, Hyperlipidemias, Sleep Apnea, GERD, Gastroesophageal Reflux, Musculoskeletal Pain Disorder, Cancer
Interventions
Blood Collection, Urine Collection, Tissue Sample Collection
Diagnostic Test
Lead sponsor
Pichamol Jirapinyo, MD, MPH
Other
Eligibility
18 Years and older
Enrollment
500 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2029
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 1, 2025 · Synced Sep 16, 2026, 3:59 PM EDT
Completed No phase listed Observational

Ghrelin Changes After Roux-en-Y Gastric Bypass

NCT00765596
View directory record Official record
Conditions
Obesity, Insulin Resistance
Interventions
Liquid diet for 3 days
Other
Lead sponsor
Vanderbilt University
Other
Eligibility
18 Years to 60 Years
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2005
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Nov 16, 2011 · Synced Sep 16, 2026, 3:59 PM EDT
Terminated Not applicable Interventional

Total Joint Arthroplasty (TJA) Weight Loss Study

NCT05156762
View directory record Official record
Conditions
Osteoarthritis, Hip, Osteoarthritis, Knee, Obesity, Morbid
Interventions
Bariatric surgery, Medical weight loss, Patient research surveys, Total joint arthroplasty (TJA), Usual standard of care
Procedure · Behavioral · Other
Lead sponsor
Boston Medical Center
Other
Eligibility
18 Years and older
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2025
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Oct 13, 2025 · Synced Sep 16, 2026, 3:59 PM EDT
Enrolling by invitation Not applicable Interventional

Endoscopic Gastroenterostomy Versus Surgical Gastrojejunostomy

NCT06567691
View directory record Official record
Conditions
Malignant Gastric Outlet Obstruction
Interventions
EUS Gastrojejunostomy, Surgical Gastrojejunostomy, Gastric Outlet Obstruction Scoring System (GOOSS)
Procedure · Other
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years and older
Enrollment
34 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Aug 25, 2025 · Synced Sep 16, 2026, 3:59 PM EDT
Recruiting Not applicable Interventional

Effect of Limb Length Ratio on Roux-en-Y Gastric Bypass Outcomes (CLIMB II Study)

NCT06293703
View directory record Official record
Conditions
Morbid Obesity
Interventions
Surgery
Procedure
Lead sponsor
Salvador Navarrete
Other
Eligibility
18 Years to 70 Years
Enrollment
262 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2030
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Mar 19, 2026 · Synced Sep 16, 2026, 3:59 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 16, 2026, 3:59 PM EDT
Completed Not applicable Interventional

Improvement of Insulin Resistance After Bariatric Surgery

NCT03853590
View directory record Official record
Conditions
Obesity, Bariatric Surgery Candidate, Insulin Tolerance
Interventions
Roux-en-Y gastric bypass, Laparoscopic adjustable gastric banding
Procedure
Lead sponsor
Beth Israel Deaconess Medical Center
Other
Eligibility
18 Years to 65 Years
Enrollment
42 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2015
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Feb 24, 2019 · Synced Sep 16, 2026, 3:59 PM EDT
Not listed No phase listed Observational Accepts healthy volunteers

Descriptive Analysis of Gut Microbiome Alterations in Hyperoxaluric Patients

NCT02794649
View directory record Official record
Conditions
Oxalate, Primary Hyperoxaluria, Microbiome
Interventions
Not listed
Lead sponsor
VA New York Harbor Healthcare System
Federal
Eligibility
18 Years to 80 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2018
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Sep 25, 2017 · Synced Sep 16, 2026, 3:59 PM EDT
Completed Phase 4 Interventional Results available

Ulcer Prevention Study in Post Gastric Bypass Patients

NCT00557349
View directory record Official record
Conditions
Marginal Ulcers
Interventions
Omeprazole, Famotidine
Drug
Lead sponsor
University of Missouri-Columbia
Other
Eligibility
18 Years and older
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
1
States / cities
Columbia, Missouri
Source: ClinicalTrials.gov public record
Updated Jan 18, 2017 · Synced Sep 16, 2026, 3:59 PM 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 16, 2026, 3:59 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Ghrelin and Insulin Resistance

NCT00884494
View directory record Official record
Conditions
Obesity, Insulin Resistance, Normal Weight,Healthy Controls
Interventions
Ghrelin infusion to assess effects on insulin sensitivity
Drug
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years to 65 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2014
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jan 19, 2017 · Synced Sep 16, 2026, 3:59 PM EDT
Terminated No phase listed Observational

The Effect of Bariatric Surgery on Spermatogenesis

NCT03725696
View directory record Official record
Conditions
Bariatric Surgery Candidate, Sexual Function and Fertility Disorders
Interventions
Semen Analysis, Hormonal panel, RYGB Gastric Bypass, IIEF Survey
Diagnostic Test · Procedure
Lead sponsor
The Cleveland Clinic
Other
Eligibility
18 Years to 55 Years · Male only
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Apr 8, 2021 · Synced Sep 16, 2026, 3:59 PM EDT
Completed No phase listed Observational Results available

Laparoscopic Versus Transabdominal Ultrasound in Morbidly Obese Patients

NCT00971750
View directory record Official record
Conditions
Cholelithiasis, Ultrasonography, Laparoscopic Gastric Bypass
Interventions
Not listed
Lead sponsor
Gundersen Lutheran Medical Foundation
Other
Eligibility
18 Years and older
Enrollment
253 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2011
U.S. locations
1
States / cities
La Crosse, Wisconsin
Source: ClinicalTrials.gov public record
Updated Jul 10, 2012 · Synced Sep 16, 2026, 3:59 PM EDT
Completed Phase 2Phase 3 Interventional Results available

Study on the Use of Low Dose Ketamine After Gastric Bypass and Gastrectomy

NCT02452060
View directory record Official record
Conditions
Pain, Postoperative Depression
Interventions
Ketamine, Placebo Comparator
Drug · Other
Lead sponsor
NYU Langone Health
Other
Eligibility
18 Years to 65 Years
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 15, 2020 · Synced Sep 16, 2026, 3:59 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 16, 2026, 3:59 PM EDT
Completed Not applicable Interventional Results available

IV Lidocaine on Postoperative Pain and QOR on Morbid Obese Patients Undergoing Bypass Surgery

NCT01180660
View directory record Official record
Conditions
Pain, Obesity
Interventions
Lidocaine Infusion, Normal Saline
Drug
Lead sponsor
Northwestern University
Other
Eligibility
18 Years to 70 Years
Enrollment
51 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2012
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Aug 6, 2014 · Synced Sep 16, 2026, 3:59 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 16, 2026, 3:59 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 16, 2026, 3:59 PM EDT
Terminated Not applicable Interventional

Bariatric Atrial Restoration of Sinus Rhythm

NCT04050969
View directory record Official record
Conditions
Atrial Fibrillation, Morbid Obesity
Interventions
Bariatric surgery, Atrial Fibrillation (AF) Catheter Ablation
Procedure
Lead sponsor
Stanford University
Other
Eligibility
18 Years to 70 Years
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Oct 18, 2022 · Synced Sep 16, 2026, 3:59 PM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Postprandial Nutrient Homeostasis Before and After Weight Loss Induced by Low-calorie Diet or RYGB

NCT03091725
View directory record Official record
Conditions
Obesity
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
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2026
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Aug 24, 2026 · Synced Sep 16, 2026, 3:59 PM EDT
Withdrawn No phase listed Observational

Mechanisms of Diabetes Control After Weight Loss Surgery, Sub-study #1

NCT01930448
View directory record Official record
Conditions
Gastric Bypass Surgery, Gastric Banding, Type 2 Diabetes
Interventions
Not listed
Lead sponsor
St. Luke's-Roosevelt Hospital Center
Other
Eligibility
20 Years to 60 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2014
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Sep 10, 2015 · Synced Sep 16, 2026, 3:59 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

GI Neuromuscular Pathology Prospective Registry

NCT02165059
View directory record Official record
Conditions
Gastroparesis
Interventions
Surgical Full Thickness Biopsy
Procedure
Lead sponsor
Indiana University
Other
Eligibility
6 Months to 90 Years
Enrollment
300 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2026
U.S. locations
1
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated Jun 15, 2026 · Synced Sep 16, 2026, 3:59 PM EDT
Completed Not applicable Interventional Results available

Study of ECHELON ENDOPATH(TM) Staple Line Reinforcement

NCT04544865
View directory record Official record
Conditions
Gastric Procedures, Lung Resection Procedures
Interventions
Staple Line Reinforcement
Device
Lead sponsor
Ethicon Endo-Surgery
Industry
Eligibility
18 Years and older
Enrollment
240 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2023
U.S. locations
8
States / cities
Indianapolis, Indiana • Baton Rouge, Louisiana • Detroit, Michigan + 5 more
Source: ClinicalTrials.gov public record
Updated Dec 4, 2023 · Synced Sep 16, 2026, 3:59 PM EDT