Gastrointestinal examination

A gastrointestinal (GI) examination is a thorough assessment of the digestive tract, which includes the esophagus, stomach, small intestine, large intestine (colon), rectum, liver, pancreas, and gallbladder.

Because the GI tract is a long, continuous tube, examinations range from simple physical palpation (feeling the belly) to advanced camera-based scopes. Doctors perform these exams to diagnose causes of abdominal pain, bleeding, chronic heartburn, changes in bowel habits, or unexplained weight loss.

Here is a breakdown of how a GI examination is conducted, from the doctor's office to the procedure room.

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Part 1: The Physical Examination (The "Abdominal Exam")

Before any high-tech scopes are used, a doctor will perform a physical exam using four standard techniques: Inspection, Auscultation, Percussion, and Palpation.

1. Inspection: The doctor looks at the abdomen for:

   • Distension: Swelling or bloating.

   • Scars: Indicating past surgeries.

   • Visible veins or lumps.

   • Skin changes: Yellowing (jaundice) indicates liver issues; spider angiomas may indicate liver disease.

2. Auscultation (Listening): Using a stethoscope, the doctor listens to bowel sounds.

   • High-pitched sounds: May indicate early bowel obstruction.

   • Silence (No sounds): Could indicate paralytic ileus (the bowel has stopped working).

3. Percussion (Tapping): The doctor taps on different areas of the abdomen.

   • Hollow sounds: Normal over air-filled loops of bowel.

   • Dull sounds: May indicate fluid (ascites) or solid masses.

4. Palpation (Feeling): The doctor presses gently (superficial) and then deeply (deep palpation) on the abdomen.

   • Tenderness: Pain when pressing (e.g., right upper quadrant pain may indicate gallbladder issues).

   • Rebound Tenderness: Pain that is worse when the doctor quickly removes their hand. This often indicates peritoneal irritation (inflammation of the lining of the abdomen), such as in appendicitis.

   • Masses: Feeling for abnormal lumps or enlarged organs (like the liver or spleen).

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Part 2: Stool and Breath Tests (Non-Invasive)

• Fecal Occult Blood Test (FOBT) / FIT Test: Checks for hidden (occult) blood in the stool, which can be an early sign of polyps or colorectal cancer.

• Stool Culture: Checks for bacteria, parasites, or viruses if you have chronic diarrhea.

• H. Pylori Breath/Stool Test: Checks for Helicobacter pylori, a bacteria that causes stomach ulcers.

• Fecal Calprotectin: Measures inflammation in the intestines; used to differentiate between Inflammatory Bowel Disease (IBD) and Irritable Bowel Syndrome (IBS).

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Part 3: Imaging Studies (Visualizing the Organs)

• Abdominal Ultrasound: Uses sound waves to visualize the gallbladder, liver, pancreas, and kidneys. It is the best test for detecting gallstones.

• CT Scan (Computed Tomography): A detailed X-ray that provides cross-sectional images. Excellent for diagnosing appendicitis, diverticulitis, pancreatitis, and cancers. Often done with oral or IV contrast.

• MRI/MRCP: An MRI of the abdomen. MRCP (Magnetic Resonance Cholangiopancreatography) is specifically used to look at the bile ducts and pancreatic duct without using an invasive scope.

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Part 4: Endoscopic Procedures (The "Gold Standard")

These are the most definitive ways to examine the inside of the GI tract using a camera on a flexible tube.

1. Upper Endoscopy (EGD - EsophagoGastroDuodenoscopy)

• What it is: A camera on a thin tube is passed through the mouth, down the esophagus, into the stomach, and into the first part of the small intestine (duodenum).

• What it finds: Hiatal hernias, esophagitis, ulcers, gastritis, Celiac disease, and tumors.

• Can it treat? Yes. During the procedure, doctors can stop bleeding, remove small polyps, or take biopsies (tissue samples).

2. Colonoscopy

• What it is: A camera on a thin tube is inserted through the rectum to examine the entire large intestine (colon).

• What it finds: Colorectal cancer, precancerous polyps, diverticulosis, and inflammation from Crohn's disease or Ulcerative Colitis.

• Can it treat? Yes. Polyps can be removed during the procedure, preventing them from turning into cancer later.

3. Flexible Sigmoidoscopy

• What it is: Similar to a colonoscopy, but only examines the lower third of the colon (the sigmoid colon and rectum).

• Use: Often used for rapid assessment of rectal bleeding or inflammation.

4. Endoscopic Ultrasound (EUS)

• What it is: An endoscope with an ultrasound probe on the tip. It allows doctors to see through the wall of the GI tract into nearby organs.

• Use: Staging pancreatic cancer, evaluating deep lumps, or draining pancreatic pseudocysts.

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Summary: Which Test for Which Symptom?

Preparation is Key

For many GI exams (especially colonoscopy), the preparation is vital.

• Colonoscopy Prep: You must drink a special solution to completely empty the colon. If the colon is not clean, the doctor cannot see polyps or cancer, and the procedure may need to be repeated.

• Upper Endoscopy Prep: Typically requires fasting (no food or water) for 6-8 hours prior.