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Bariatric Surgery Workup

  • Author: Alan A Saber, MD, MS, FACS; Chief Editor: John Geibel, MD, DSc, MSc, MA  more...
Updated: Jun 15, 2016

Laboratory Studies

Preoperative laboratory evaluation should include the following:

  • Complete blood count (CBC)
  • Complete chemistry panel
  • Liver function tests
  • Thyroid function tests
  • Lipid profile
  • Coagulation tests
  • Serum iron and total iron binding capacity (TIBC)
  • Vitamin B12
  • Folic acid
  • Blood typing
  • Urinalysis

Imaging Studies

Imaging studies to be considered in the setting of bariatric surgery include the following:

  • Chest radiography
  • Ultrasonography of the gallbladder

Diagnostic Procedures

Upper gastrointestinal (GI) endoscopy is performed to rule out intrinsic upper GI disease because after gastric bypass surgery, the ability to nonsurgically visualize the distal stomach and the duodenum could be a challenge.

Contributor Information and Disclosures

Alan A Saber, MD, MS, FACS FASMBS, Director of Bariatric and Metabolic Surgery, University Hospitals Case Medical Center; Surgical Director, Bariatric Surgery, Metabolic and Nutrition Center, University Hospitals Digestive Health Institute; Associate Professor of Surgery, Case Western Reserve University School of Medicine

Alan A Saber, MD, MS, FACS is a member of the following medical societies: American College of Surgeons, American Society for Metabolic and Bariatric Surgery, American Society for Gastrointestinal Endoscopy

Disclosure: Nothing to disclose.


Tarek H El-Ghazaly, MD Fellow of Minimally Invasive and Bariatric Surgery Research, Michigan State University, Kalamazoo Center for Medical Studies

Disclosure: Nothing to disclose.

Specialty Editor Board

Francisco Talavera, PharmD, PhD Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Received salary from Medscape for employment. for: Medscape.

Chief Editor

John Geibel, MD, DSc, MSc, MA Vice Chair and Professor, Department of Surgery, Section of Gastrointestinal Medicine, and Department of Cellular and Molecular Physiology, Yale University School of Medicine; Director, Surgical Research, Department of Surgery, Yale-New Haven Hospital; American Gastroenterological Association Fellow

John Geibel, MD, DSc, MSc, MA is a member of the following medical societies: American Gastroenterological Association, American Physiological Society, American Society of Nephrology, Association for Academic Surgery, International Society of Nephrology, New York Academy of Sciences, Society for Surgery of the Alimentary Tract

Disclosure: Received royalty from AMGEN for consulting; Received ownership interest from Ardelyx for consulting.

Additional Contributors

Brian J Daley, MD, MBA, FACS, FCCP, CNSC Professor and Program Director, Department of Surgery, Chief, Division of Trauma and Critical Care, University of Tennessee Health Science Center College of Medicine

Brian J Daley, MD, MBA, FACS, FCCP, CNSC is a member of the following medical societies: American Association for the Surgery of Trauma, Eastern Association for the Surgery of Trauma, Southern Surgical Association, American College of Chest Physicians, American College of Surgeons, American Medical Association, Association for Academic Surgery, Association for Surgical Education, Shock Society, Society of Critical Care Medicine, Southeastern Surgical Congress, Tennessee Medical Association

Disclosure: Nothing to disclose.


We wish to thank Ollie J Jackson III, MD, Department of General Surgery, Michigan State University, Kalamazoo Center for Medical Studies, for previous contributions to this entry.

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Laparoscopic Roux-en-Y gastric bypass.
Adjustable gastric banding.
Sleeve gastrectomy.
Long Roux-en-Y gastric bypass.
Biliopancreatic diversion with duodenal switch.
Progression of surgical techniques, with open surgery in the first image and single-incision, transumbilical laparoscopic surgery in the third illustration.
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