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ClinicalTrials.gov public records Last synced Oct 5, 2026, 4:29 AM EDT

Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.

Showing 25–48 of 61 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: RYGB Gastric Bypass Clear all
Terminated Not applicable Interventional

Bariatric Surgery for ESRD Patients vs Control

NCT00580762
View directory record Official record
Conditions
Obesity, ESRD
Interventions
Roux-en-y gastric bypass (RYGB)
Procedure
Lead sponsor
Yale University
Other
Eligibility
18 Years to 65 Years
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2011
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Sep 7, 2016 · Synced Oct 5, 2026, 4:29 AM EDT
Completed Phase 1Phase 2 Interventional Results available

Oxazyme in Patients With Hyperoxaluria

NCT01127087
View directory record Official record
Conditions
Hyperoxaluria
Interventions
Oxazyme
Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Dec 24, 2012 · Synced Oct 5, 2026, 4:29 AM EDT
Completed No phase listed Observational

Metabolomics of Roux-en-Y Gastric Bypass (RYGB) With Gastrostomy

NCT00887302
View directory record Official record
Conditions
Type II Diabetes Mellitus, Obesity
Interventions
Gastric Band, Gastric Sleeve, Gastrostomy Tube
Procedure
Lead sponsor
East Carolina University
Other
Eligibility
18 Years to 60 Years · Female only
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
Greenville, North Carolina
Source: ClinicalTrials.gov public record
Updated Oct 6, 2023 · Synced Oct 5, 2026, 4:29 AM 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 2, 2025 · Synced Oct 5, 2026, 4:29 AM EDT
Recruiting Phase 4 Interventional Accepts healthy volunteers

Fibrosis Lessens After Metabolic Surgery

NCT06374875
View directory record Official record
Conditions
Metabolic Dysfunction-associated Steatotic Liver Disease (MASLD), Non-Alcoholic Fatty Liver Disease, Metabolic Dysfunction-Associated Steatohepatitis (MASH), Liver Fibrosis, Obesity
Interventions
Metabolic surgery, Incretin-Based Therapy
Procedure · Drug
Lead sponsor
The Cleveland Clinic
Other
Eligibility
18 Years to 75 Years
Enrollment
120 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2029
U.S. locations
4
States / cities
Phoenix, Arizona • Indianapolis, Indiana • Rochester, Minnesota + 1 more
Source: ClinicalTrials.gov public record
Updated Jul 31, 2026 · Synced Oct 5, 2026, 4:29 AM 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 25, 2026 · Synced Oct 5, 2026, 4:29 AM EDT
Completed Not applicable Interventional

DSS: Diabetes Surgery Study - Intensive Medical Management of Type 2 Diabetes, With and Without Gastric Bypass Surgery

NCT00641251
View directory record Official record
Conditions
Type 2 Diabetes, Cardiovascular Disease
Interventions
intensive medical management, RYGB & IMM
Other
Lead sponsor
Medtronic - MITG
Industry
Eligibility
30 Years to 67 Years
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2016
U.S. locations
3
States / cities
Minneapolis, Minnesota • Rochester, Minnesota • New York, New York
Source: ClinicalTrials.gov public record
Updated Nov 29, 2017 · Synced Oct 5, 2026, 4:29 AM EDT
Recruiting Not applicable Interventional

GI Oxalate Absorption

NCT05356000
View directory record Official record
Conditions
Bariatric Surgery Candidate, Kidney Stone
Interventions
Special low-oxalate diet followed by all-day visit to University of Chicago research clinic
Other
Lead sponsor
University of Chicago
Other
Eligibility
18 Years to 70 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2026
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Aug 19, 2025 · Synced Oct 5, 2026, 4:29 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Cerebrospinal Fluid Biomarkers in Bariatric Surgery

NCT04350892
View directory record Official record
Conditions
Obesity
Interventions
Roux-en-Y Gastric Bypass (RYGB), Sleeve Gastrectomy (SG), Very Low Calorie Diet (VLCD)
Procedure · Behavioral
Lead sponsor
Columbia University
Other
Eligibility
18 Years to 65 Years
Enrollment
51 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2025
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jan 28, 2026 · Synced Oct 5, 2026, 4:29 AM EDT
Not listed No phase listed Observational Accepts healthy volunteers

Mechanisms of Post-Bariatric Hypoglycemia

NCT04428866
View directory record Official record
Conditions
Hypoglycemia
Interventions
Continuous Glucose Monitoring, activity monitor, Mixed meal tolerance test, Glucagon Sensitivity Testing, Hypoglycemic Hyperinsulinemic Clamp, analysis of fecal microbiome
Diagnostic Test
Lead sponsor
Joslin Diabetes Center
Other
Eligibility
18 Years to 70 Years
Enrollment
105 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2024
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 5, 2024 · Synced Oct 5, 2026, 4:29 AM EDT
Terminated No phase listed Observational

Eye Movement Testing in Patients With Obesity and the Impact of Weight Loss Surgery

NCT04940429
View directory record Official record
Conditions
Bariatric Surgery Candidate, Obesity, Morbid
Interventions
Neurofit, Psychometric hepatic encephalopathy score
Device · Diagnostic Test
Lead sponsor
Stanford University
Other
Eligibility
18 Years to 65 Years
Enrollment
19 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
1
States / cities
Redwood City, California
Source: ClinicalTrials.gov public record
Updated Jun 25, 2021 · Synced Oct 5, 2026, 4:29 AM EDT
Active, not recruiting No phase listed Observational

Comparison of Body Composition Changes With Weight Loss Interventions

NCT07115069
View directory record Official record
Conditions
Obesity
Interventions
GLP-1 receptor agonist, Gastric Bypass Surgery (laparoscopic), Gastric Bypass Surgery (robotic)
Drug · Procedure
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
21 Years to 65 Years
Enrollment
60 participants
Timeline
2025 – 2027
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jul 14, 2026 · Synced Oct 5, 2026, 4:29 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Trial Of Paricalcitol and Cholecalciferol(Vitamin D3) in the Treatment Of Secondary Hyperparathyroidism in Patients After ROUX-EN-Y Gastric Bypass Surgery

NCT01138475
View directory record Official record
Conditions
Gastric Bypass, Parathyroid Hormone
Interventions
Paricalcitol, Cholecalciferol, Placebo
Drug
Lead sponsor
Kerstyn C. Zalesin, M.D.
Other
Eligibility
18 Years to 100 Years
Enrollment
49 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2015
U.S. locations
1
States / cities
Royal Oak, Michigan
Source: ClinicalTrials.gov public record
Updated Mar 22, 2017 · Synced Oct 5, 2026, 4:29 AM 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 9, 2021 · Synced Oct 5, 2026, 4:29 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 29, 2009 · Synced Oct 5, 2026, 4:29 AM EDT
Active, not recruiting No phase listed Observational

Effects of Weight Loss Surgery on Bone Health in Adolescents

NCT02557438
View directory record Official record
Conditions
Obesity, Surgery
Interventions
Roux-en-Y Gastric Bypass, Vertical Sleeve Gastrectomy
Procedure
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
13 Years to 25 Years
Enrollment
240 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2027
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Sep 25, 2025 · Synced Oct 5, 2026, 4:29 AM 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 17, 2011 · Synced Oct 5, 2026, 4:29 AM EDT
Active, not recruiting Not applicable Interventional

Bariatric Surgery Versus Diet Alone in the Bile Acid Pathway and Weight Loss

NCT03238794
View directory record Official record
Conditions
Obesity
Interventions
Roux-En-Y Gastric Bypass, Low-calorie Diet
Procedure · Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 65 Years
Enrollment
21 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2027
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Feb 11, 2026 · Synced Oct 5, 2026, 4:29 AM EDT
Completed No phase listed Observational

Mechanisms of Glycemic Improvement After Gastrointestinal Surgery

NCT01025999
View directory record Official record
Conditions
Diabetes Mellitus, Type II
Interventions
No intervention
Other
Lead sponsor
University of Washington
Other
Eligibility
18 Years and older
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2015
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Mar 31, 2016 · Synced Oct 5, 2026, 4:29 AM EDT
Terminated Phase 1 Interventional Results available

Orthostatic Intolerance After Bariatric Surgery

NCT03808740
View directory record Official record
Conditions
Orthostatic Intolerance
Interventions
Atomoxetine, Placebo
Drug
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years to 60 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Sep 27, 2024 · Synced Oct 5, 2026, 4:29 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Alcohol Related Impairment and Reinforcement: Pre to Post Roux en Y Gastric Bypass Surgery

NCT02370732
View directory record Official record
Conditions
Bariatric Surgery Candidate
Interventions
Alcohol
Other
Lead sponsor
Neuropsychiatric Research Institute, Fargo, North Dakota
Other
Eligibility
21 Years to 65 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2019
U.S. locations
1
States / cities
Fargo, North Dakota
Source: ClinicalTrials.gov public record
Updated Sep 28, 2016 · Synced Oct 5, 2026, 4:29 AM EDT
Recruiting No phase listed Observational

Gut Microbiota in Metabolic Surgery

NCT05000996
View directory record Official record
Conditions
Bariatric Surgery Candidate, Cardiovascular Diseases, Type 2 Diabetes, Dyslipidemias, Hypertension, Morbid Obesity
Interventions
Bariatric Surgery
Procedure
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
21 Years to 65 Years
Enrollment
300 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2035
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Nov 4, 2025 · Synced Oct 5, 2026, 4:29 AM EDT
Active, not recruiting Phase 3 Interventional

Avexitide for Treatment of Post-Bariatric Hypoglycemia

NCT06747468
View directory record Official record
Conditions
Post Bariatric Hypoglycemia
Interventions
Avexitide, Placebo
Drug · Other
Lead sponsor
Amylyx Pharmaceuticals Inc.
Industry
Eligibility
18 Years and older
Enrollment
75 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
21
States / cities
Stanford, California • Aurora, Colorado • Jacksonville, Florida + 16 more
Source: ClinicalTrials.gov public record
Updated Aug 24, 2026 · Synced Oct 5, 2026, 4:29 AM EDT
Enrolling by invitation No phase listed Observational

Endoscopic Metabolic and Bariatric Therapies

NCT05725967
View directory record Official record
Conditions
Obesity, Obesity, Morbid, Obesity Associated Disorder, Bariatric Surgery Candidate, Fistula, Gastric, Roux-en-y Anastomosis Site, Ulcer, Gastric, Abdominal Pain, Abdominal Obesity, Complication of Surgical Procedure, Complication of Treatment, Complication,Postoperative, Weight Gain, Weight Loss, Leak, Anastomotic, Delayed Gastric Emptying Following Procedure
Interventions
Primary Obesity Endoscopic Procedures, Endoscopic Revision of Bariatric Surgical Procedures, Bariatric Surgery Procedures, Endoscopic Sleeve Gastroplasty, Trans-oral Outlet Reduction, Intragastric Balloon, Primary obesity surgery endoluminal, Restorative obesity surgery endoluminal, Argon Plasma Coagulation, Gastroplasty with Endoscopic Myotomy, Bariatric Endoscopic Antral Myotomy, Pylorus Sparing Antral Myotomy, Aspiration Therapy
Procedure · Device
Lead sponsor
Christopher C. Thompson, MD, MSc
Other
Eligibility
18 Years to 80 Years
Enrollment
5,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2029
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 2, 2025 · Synced Oct 5, 2026, 4:29 AM EDT