Diagnostic Upper Endoscopy (EGD)

A diagnostic upper endoscopy, also called an EGD (esophagogastroduodenoscopy), is a minimally invasive, generally safe, and well-tolerated exam. A thin, flexible camera passes through the mouth to look directly at the esophagus, stomach, and first part of the small intestine (duodenum) (Yadlapati et al., ACG/AGA Quality Indicators for Upper GI Endoscopy, 2025). It is one of the most common procedures in medicine. About 7.5 million EGDs were performed in U.S. adults in 2019, up from 6.1 million in 2013 (Yadlapati et al., 2025).

EGD is the most widely used objective test for evaluating the lining of the esophagus. It is the only test that can directly see, photograph, and biopsy abnormalities such as erosive esophagitis, Barrett's esophagus, ulcers, strictures, and tumors (Katz et al., ACG Clinical Guideline for GERD, 2022). Accepted uses include evaluating swallowing difficulty, painful swallowing, reflux symptoms, upper abdominal symptoms, and GI bleeding. EGD is also used to screen for and monitor precancerous conditions (Yadlapati et al., 2025).

EGD is also overused. National data show it is performed without an appropriate indication in 5% to 49% of cases (Yadlapati et al., 2025). A high-quality EGD is one that is clearly indicated, thorough, and changes your care. When the endoscopist is also the surgeon who may operate on you, the exam answers the questions that matter for surgical planning.

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The endoscope is a flexible tube about the width of a finger, with a high-definition camera and light at its tip. As it advances, the endoscopist:

• Inspects the full upper GI tract, from the top of the esophagus through the stomach, including a retroflexed ("looking back") view of the upper stomach, and into the second part of the duodenum (Yadlapati et al., 2025)

• Inflates the stomach gently with air or CO₂ to flatten folds and expose the lining

• Photographs standard landmarks, including the esophagus, the gastroesophageal junction, the upper stomach, the antrum and pylorus, and the duodenum, to document a complete exam (Yadlapati et al., 2025)

• Takes biopsies with tiny forceps passed through the scope. Biopsies are painless because the lining has no pain-sensing nerves.

• Uses enhanced imaging such as narrow-band imaging to highlight subtle precancerous changes

International standards call for a diagnostic EGD to last at least 7 minutes from insertion to removal, because rushed exams miss disease (Areia et al., ESGE Performance Measures for Upper GI Endoscopy, 2025).

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• A definitive diagnosis: Erosive esophagitis and Barrett's esophagus seen on EGD are specific for GERD. Los Angeles grade C esophagitis is virtually always diagnostic (Katz et al., ACG, 2022).

• Cancer and precancer detection: EGD finds Barrett's esophagus, gastric precancerous changes, and early tumors, often before symptoms appear.

• Tissue diagnosis: Biopsies confirm H. pylori infection, eosinophilic esophagitis, celiac disease, and dysplasia.

• Surgical planning: Before bariatric surgery, pooled data from 15,177 patients showed EGD changed the planned surgical approach or delayed surgery in 16.8% (Brown et al., IFSO Position Statement, Obesity Surgery, 2020).

• Same-session treatment: Strictures can be dilated, bleeding treated, foreign bodies removed, and wireless pH capsules placed during the same exam.

• Outpatient and fast: Most patients go home the same day.

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EGD is appropriate for patients with:

• Reflux with alarm symptoms: trouble swallowing, weight loss, bleeding, vomiting, or anemia. Endoscopy should be done as soon as feasible (Katz et al., ACG, 2022).

• Reflux that doesn't respond to medication, or that returns after an 8-week course of treatment (Fass, New England Journal of Medicine, 2022)

• Candidates for antireflux or bariatric surgery (Fass, 2022)

• High risk for Barrett's esophagus: chronic reflux for 5 years or more plus three or more risk factors (male sex, age over 50, White race, smoking, obesity, or family history) (Fass, 2022)

• Known Barrett's esophagus needing surveillance

• Upper GI bleeding, black stools, or unexplained iron-deficiency anemia

• Persistent upper abdominal pain, nausea, or vomiting

• Bariatric patients with new symptoms: reflux after sleeve gastrectomy, pain or ulcer after gastric bypass, food intolerance, or weight regain

• Abnormal imaging showing a mass, ulcer, stricture, or hiatal hernia

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Before the procedure, a health history and focused physical exam are completed, and a sedation plan is documented based on your risk (Elmunzer et al., ACG/AGA Quality Indicators Common to All GI Endoscopic Procedures, 2024). Most patients receive monitored anesthesia (propofol). The European Society of Gastrointestinal Endoscopy recommends propofol as first-line sedation where resources allow, and it also supports offering unsedated EGD for patients who prefer it (Triantafyllou et al., ESGE/ESGENA Sedation Guideline, Endoscopy, 2026).

You lie on your left side with a soft mouth guard in place. After sedation, the scope passes gently through the mouth into the esophagus, stomach, and duodenum. The exam is systematic: the esophageal lining, the gastroesophageal junction and hiatus, the entire stomach including a retroflexed view, and the duodenum. Biopsies follow standardized protocols:

• Barrett's esophagus: Seattle protocol biopsies (Areia et al., ESGE, 2025)

• Suspected eosinophilic esophagitis: at least 6 biopsies from 2 levels of the esophagus (Yadlapati et al., 2025)

• Suspected celiac disease: at least 4 duodenal biopsies plus a duodenal bulb sample (Januszewicz and Kaminski, Therapeutic Advances in Gastroenterology, 2019)

• Gastric ulcers: biopsies to exclude cancer (Januszewicz and Kaminski, 2019)

Most diagnostic EGDs take about 10 to 20 minutes. Recovery monitoring continues until your vital signs return to baseline (Triantafyllou et al., 2026).

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EGD is one of the safest procedures in medicine:

• Overall adverse events: 1 in 200 to 1 in 10,000 procedures. Mortality ranges from none to 1 in 2,000 across large series (ASGE Standards of Practice Committee, Adverse Events of Upper GI Endoscopy, 2012).

• Sedation and heart-lung events: These account for up to 60% of complications. They include low oxygen, aspiration, blood pressure changes, and irregular heart rhythms (Januszewicz and Kaminski, 2019).

• Perforation: 0.30 or fewer per 10,000 EGDs (Yadlapati et al., 2025)

• Bleeding: less than 0.5% of diagnostic exams, usually minor tears near the gastroesophageal junction (Januszewicz and Kaminski, 2019)

• Death: about 0.11 per 10,000 EGDs (Yadlapati et al., 2025)

• Minor effects: sore throat, bloating, and mild cramping that resolve within hours

In a study of nearly 40,000 sedated outpatient EGDs, complication rates were similar with or without sedation, and similar in younger and older patients (Jang et al., Medicine, 2022).

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Most patients are awake within minutes and go home the same day. Because of sedation, an accompanying adult must take you home, and you should receive oral and written instructions with a number to call for any delayed problem (Triantafyllou et al., 2026). Plan no driving, important decisions, or work for the rest of the day. A mild sore throat and bloating are common and short-lived. Most patients resume a normal diet the same day unless a dilation or other treatment was performed. Biopsy results are reviewed at your follow-up visit.

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A single high-quality EGD often provides answers that guide years of care. A normal exam can rule out serious disease and help redirect testing toward pH monitoring or manometry. Abnormal findings lead to a clear plan: healing therapy for esophagitis, H. pylori eradication, surveillance for Barrett's esophagus, or surgical planning. For severe (LA grade C or D) esophagitis, a repeat EGD after PPI treatment is recommended to confirm healing and look for Barrett's esophagus hidden by inflammation (Katz et al., ACG, 2022). For nondysplastic Barrett's, surveillance occurs no more often than every 3 to 5 years (Shaheen et al., ACP Best Practice Advice, 2012).

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More in Esophageal Motility and Swallowing Procedures

Related procedures: Laparoscopic Heller Myotomy, POEM, Dor Fundoplication for Reflux and After Heller Myotomy, Esophageal Diverticulum, Esophageal Dilation. For an overview of all options, see Foregut Surgery.

Conditions treated: Achalasia, Dysphagia, Esophagogastric Junction Outflow Obstruction, Diffuse Esophageal Spasm, Jackhammer Esophagus, Esophageal Diverticulum.

Most endoscopists describe what they see. A foregut and bariatric surgeon also sees what it means for your operation. Dr. Nestor de la Cruz-Muñoz, MD, FACS, DABOM, performs his own diagnostic endoscopy, so the person looking at your hiatus, valve, sleeve, or pouch is the same person who would repair it.

• A surgeon's eye on the exam: Key findings are measured and documented with surgery in mind: hiatal hernia size, the appearance of the valve at the gastroesophageal junction, sleeve narrowing or twisting, dilated gastric bypass pouches, marginal ulcers, and gastro-gastric fistulas.

• One continuous care pathway: Findings lead directly to the right next step, whether that is medical therapy, dilation, pH testing, anti-reflux surgery, LINX, TIF, hiatal hernia repair, or revisional bariatric surgery.

• Teaching leadership: He served as a surgical fellowship director for ten years, training surgeons in advanced bariatric, foregut, and endoscopic care.

• Evidence-based quality: Exams follow national standards, including complete photodocumentation, protocol biopsies, and adequate inspection time.

• Complex anatomy experience: Endoscopy after sleeve gastrectomy, gastric bypass, duodenal switch, fundoplication, and prior revisions requires familiarity with altered anatomy.

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Dr. de la Cruz-Muñoz has performed more than 15,000 minimally invasive procedures over more than 25 years in practice, including complex foregut, hernia, gallbladder and abdominal operations as well as bariatric surgery.

EGD is central to reflux evaluation:

• Grading esophagitis: Erosive esophagitis is graded with the Los Angeles classification. LA grade A is not sufficient for a definitive GERD diagnosis. LA grade B supports it when typical symptoms respond to PPIs. LA grade C or D confirms GERD (Katz et al., ACG, 2022).

• Barrett's segments: A Barrett's segment longer than 3 cm with intestinal metaplasia is diagnostic of GERD and removes the need for pH testing just to confirm it (Katz et al., 2022).

• Testing off PPIs: Non-erosive reflux disease should only be diagnosed when EGD is performed off PPIs, because acid suppression can heal erosions and hide disease (Katz et al., 2022).

• Wireless pH capsules: A wireless pH capsule can be placed during EGD for prolonged reflux monitoring.

• Before anti-reflux surgery: EGD is recommended before antireflux or bariatric surgery (Fass, New England Journal of Medicine, 2022).

• Before sleeve gastrectomy: A hiatal hernia with reflux esophagitis is a relative contraindication to sleeve gastrectomy because of the risk of worsening reflux (Evans et al., ASGE/SAGES Guideline on Endoscopy in the Bariatric Patient, 2015).

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EGD is the first step in evaluating almost every revisional problem. It assesses:

• Reflux after sleeve gastrectomy (esophagitis, Barrett's, sleeve stricture or twist, hiatal hernia)

• Marginal ulcers, strictures, and fistulas after gastric bypass

• Failed or slipped fundoplications and recurrent hiatal hernias

• Band erosion or slippage before band removal or conversion

• Pouch and outlet size before TORe or surgical revision for weight regain

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Diagnostic EGD is covered by most insurance plans, including Medicare, when there is a documented medical indication such as alarm symptoms, PPI-refractory reflux, bleeding, anemia, dysphagia, Barrett's surveillance, or pre-operative evaluation for antireflux or bariatric surgery. Insurers may question screening EGD in patients without risk factors, consistent with national guidance that routine screening is not recommended in women or in men under 50 (Shaheen et al., ACP, 2012). Barrett's surveillance performed more often than every 3 to 5 years without dysplasia may also be questioned.

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• Fasting: No clear liquids for 2 hours, no light meal for 6 hours, and no fatty or fried food for 8 hours before sedation. Patients with gastroparesis or achalasia may need longer (Elmunzer et al., ACG/AGA, 2024).

• GLP-1 medications (Ozempic, Wegovy, Mounjaro, Zepbound): Current multisociety guidance supports an individualized approach. Low-risk patients may continue the medication. For those holding it, the suggested hold is the day of the procedure for daily drugs and one week before for weekly drugs. Symptoms of delayed stomach emptying are reassessed on the day of the procedure (Kindel et al., Multisociety Clinical Practice Guidance, 2025). A 24-hour liquid diet before the procedure may help (American Diabetes Association Standards of Care, 2026). In the 2026 OCULUS randomized trial, about 25% of patients who continued their GLP-1 or GIP/GLP-1 medication had clinically significant retained stomach contents, vs about 3% of those who held one dose (Ahmad et al., JAMA Internal Medicine, 2026). Follow the specific instructions you are given.

• PPIs: If the goal is to diagnose reflux disease, you may be asked to stop your PPI beforehand (Katz et al., ACG, 2022).

• Blood thinners: Bring a complete medication list. Management is individualized.

• Ride home: Arrange for an adult to accompany you home.

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Most patients resume their normal diet the same day, starting with liquids and light foods once the throat numbness and sedation wear off. After esophageal dilation, a soft diet may be advised briefly. Bariatric patients resume their usual stage-appropriate diet and supplements unless instructed otherwise.

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Rest for the remainder of the day after sedation, and plan no driving, alcohol, or important decisions until the next day. Most patients return to work and normal exercise the following day. Call right away for severe chest or abdominal pain, fever, black stools, vomiting blood, or trouble swallowing.

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An EGD takes less than an hour, so international patients often combine it with a surgical consultation in a single short visit. Bring prior reports so findings can be compared. Biopsy results are usually available within a week and are reviewed with you virtually.