| Unknown | Examining Patterns in the Involvement of Gastric Bypass Patients in Clinical Studies NCT05715892 | Power Life Sciences Inc. | — |
| Recruiting | Endoscopic Ultrasound-guided Large Diameter Lumen-apposing Metal Stent Gastro-gastrostomy for Bypass Reversal NCT05640947 | University Hospital, Ghent | N/A |
| Active Not Recruiting | SH Dr. Chen Gastric Bypass Study NCT05357443 | Sanford Health | N/A |
| Active Not Recruiting | Napoleon Measurement of Gastrojejunal Anastomosis NCT04832282 | NYU Langone Health | N/A |
| Completed | Assessing Insulin Turnover Using an In-vivo Deuterated Water Experiment. NCT04332289 | Lia Bally | — |
| Completed | Effect of Meal Texture on Glucose-metabolism and Gut Hormone Response After Bariatric Surgery NCT04082923 | Hvidovre University Hospital | N/A |
| Completed | Assessment of Pouch Emptying With MRI After Roux-en-Y Gastric Bypass NCT06298162 | Rijnstate Hospital | — |
| Withdrawn | Mini Gastric Bypass vs Roux enY Gastric Bypass NCT03673969 | Doncaster And Bassetlaw Hospitals NHS Foundation Trust | N/A |
| Completed | Impact of a Specific Micronutrient-probiotic-supplement on Fatty Liver of Patients After Mini-Gastric Bypass S NCT03585413 | Bonn Education Association for Dietetics r.A., Cologne, Germany | Phase 3 |
| Completed | Oversewing Staple Line of The Gastric Remnant NCT04884230 | Unidad Internacional de Cirugia Bariatrica y Metabolica | — |
| Completed | Small Intestinal Bacterial Overgrowth Obese NCT02819037 | Lille Catholic University | N/A |
| Completed | Comparing the Benefits and Harms of Three Types of Weight Loss Surgery -- The PCORnet® Bariatric Study NCT02741674 | Kaiser Permanente | — |
| Terminated | Ketamine and Propofol Combination Versus Propofol for Upper Gastrointestinal Endoscopy NCT02643979 | Icahn School of Medicine at Mount Sinai | Phase 4 |
| Recruiting | The Effects of Bariatric Surgeries on Glucose Metabolism NCT02823665 | The University of Texas Health Science Center at San Antonio | EARLY_Phase 1 |
| Terminated | Mechanistic Investigation Of Intestinal Cytochrome p450 3A4 Following Roux-en-Y Surgery And Its Effect on Plas NCT02483598 | North Dakota State University | Phase 4 |
| Unknown | Domestic Surgical Robot Clinical Study NCT02752698 | The Third Xiangya Hospital of Central South University | N/A |
| Unknown | Laparoscopic Bariatric Surgery: Impact of Deep Neuromuscular Block on Surgical Conditions NCT02118844 | Central Hospital, Nancy, France | Phase 4 |
| Completed | Study to Examine the Effect of Gastric Bypass Surgery on Venlafaxine ER Blood Levels NCT01867255 | Mayo Clinic | Phase 1 |
| Unknown | Randomized Trial of Preoperative Diets Before Bariatric Surgery NCT01652105 | Lievensberg Ziekenhuis | N/A |
| Unknown | Band to Bypass - Metabolism Kinetics in Gastric Bypass and Banding NCT01559792 | Hvidovre University Hospital | — |
| Completed | Effects of Gastric Bypass Surgery and Calcium Metabolism and the Skeleton NCT01330914 | VA Office of Research and Development | — |
| Completed | Trial Of Paricalcitol and Cholecalciferol(Vitamin D3) in the Treatment Of Secondary Hyperparathyroidism in Pat NCT01138475 | Kerstyn C. Zalesin, M.D. | Phase 3 |
| Completed | Pharmacokinetic Evaluation of Moxifloxacin Administered Intravenously and Orally in Healthy Volunteers Who Hav NCT01130922 | University Ghent | Phase 4 |
| Completed | Effect of Gastric Bypass on the Absorption of Metformin NCT01013051 | University of Alberta | — |
| Completed | Endotoxin and Intestinal Flora Before and After Gastric Bypass or Banding in Diabetics NCT00960765 | CPL Associates | — |
| Completed | Simplified Technique for Performing Laparoscopic Gastric Bypass NCT06782256 | Madigan Army Medical Center | — |
| Completed | Prospective Trial Using Gastric Stapling Line Reinforcement With Seamguard in Roux-en-Y Gastric Bypass NCT01015157 | Clinique de l'Anjou | N/A |
| Completed | Meal Stimulating After Roux-en Y Gastric Bypass NCT00915980 | Hvidovre University Hospital | — |
| Completed | Perioperative Nutrition in Gastric Bypass Surgery NCT00549237 | University Hospital, Geneva | N/A |
| Unknown | Surgical Treatment of Type 2 Diabetes Mellitus in <35 Body Mass Index (BMI) NCT00996294 | IRCCS Azienda Ospedaliera Universitaria San Martino - IST Istituto Nazionale per la Ricerca sul Cancro, Genoa, Italy | N/A |
| Completed | Effects of Bariatric Surgery on Insulin NCT00535600 | National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) | — |
| Completed | The Effect of Gastric Bypass on the Pharmacokinetics of Serotonin Reuptake Inhibitors NCT01317147 | University of Pittsburgh | — |
| Completed | Bone Loss After Laparoscopic Roux-en-Y Gastric Bypass NCT00975013 | Gundersen Lutheran Medical Foundation | — |
| Completed | Glucose Metabolism in the Immediate and Short Term Follow up After Bariatric Surgery NCT00488423 | The Cleveland Clinic | Phase 1 |
| Completed | Effect of Gastric Bypass-induced Weight Loss on Myocardial Structure, Function and Metabolism NCT00841009 | Washington University School of Medicine | — |
| Unknown | Study to Evaluate the Pharmacokinetics of Vitamin D (Cholecalciferol) in Patients Undergoing Obesity Surgery i NCT01637155 | Hospital Clinic of Barcelona | Phase 2 |