Endoscopy and Colonoscopy Guide

📷 What Are Endoscopy and Colonoscopy?

These procedures use a thin, flexible tube with a camera (endoscope) to visualize the inside of your digestive tract. They allow doctors to see abnormalities, take tissue samples (biopsies), and even perform treatments without surgery.

🔼 Upper Endoscopy (EGD) Views esophagus, stomach, duodenum

🔽 Colonoscopy Views entire colon and rectum

💊 Capsule Endoscopy Swallowed camera for small bowel

📍 Sigmoidoscopy Views only lower portion of colon

🔼 Upper Endoscopy (EGD/Gastroscopy)

What It Examines

Esophagus (food pipe)
Stomach
Duodenum (first part of small intestine)

When It's Recommended

Persistent heartburn not responding to treatment
Difficulty swallowing or painful swallowing
Unexplained nausea, vomiting, or abdominal pain
Unexplained weight loss
Anemia or suspected GI bleeding
Surveillance for Barrett's esophagus
Celiac disease diagnosis (small intestine biopsy)
Evaluation of known or suspected ulcers

The Procedure

Preparation

IV line placed; throat may be sprayed with numbing medication; sedation given (usually conscious sedation)

Scope Insertion

Thin, flexible tube passed through mouth into esophagus. You can still breathe normally.

Examination

Doctor views images on monitor, examining all areas. Air may be used to expand walls for better view.

Biopsies/Treatment

Small tissue samples may be taken (painless). Polyps can be removed, bleeding stopped, strictures dilated.

Completion

Scope removed. Procedure typically takes 10-20 minutes.

Preparation for Upper Endoscopy

Fasting: Nothing to eat or drink for 6-8 hours before
Medications: Discuss with doctor; some may need to be stopped
Arrange transportation: Cannot drive after sedation
Inform doctor of: Allergies, medications, heart conditions, pacemakers

After the Procedure

Rest in recovery area until sedation wears off (30-60 minutes)
Mild sore throat is common and temporary
Can usually eat within 1-2 hours
No driving or important decisions for 24 hours after sedation
Results often discussed immediately; biopsy results take several days

🔽 Colonoscopy

What It Examines

Rectum
Entire colon (large intestine)
Sometimes terminal ileum (end of small intestine)

When It's Recommended

Screening: Routine colon cancer screening starting at age 45-50
Family history of colon cancer or polyps
Blood in stool or positive stool test
Chronic diarrhea or constipation
Unexplained abdominal pain
Unexplained weight loss or anemia
Surveillance after polyp removal or cancer
Evaluation or monitoring of inflammatory bowel disease

Bowel Preparation

The most challenging but crucial part of colonoscopy. A clean colon allows the doctor to see clearly and detect abnormalities.

Types of Bowel Prep

PEG solutions (Golytely, Peglec): Large volume (4 liters), very effective
Low-volume preps (Miralax/PEG, Prepopik): Less to drink, combined with clear fluids
Sodium sulfate preps (Sutab tablets): Pill form with water
Split-dose: Half the night before, half morning of procedure (recommended)

Dietary Restrictions Before Colonoscopy

3-5 days before: Avoid seeds, nuts, popcorn, raw vegetables with skin

1-2 days before: Low-fiber diet (white rice, eggs, plain chicken, white bread)

Day before: Clear liquids only (water, clear broth, apple juice, tea, Jell-O without red/purple color)

Avoid: Red or purple drinks/Jell-O (can look like blood)

Tips for Easier Prep

Chill the prep solution; drink through a straw
Suck on a lemon or ginger candy between sips
Stay near a bathroom once you start
Use soft toilet paper or wipes; apply barrier cream
Keep yourself occupied (TV, reading)
Set alarms if doing split-dose
Remember: good prep = better results

The Procedure

Step	What Happens	Duration
Check-in	Paperwork, change into gown, IV placed	30-45 min
Sedation	Medication given through IV; you'll be comfortable	5 min
Insertion	Scope passed through rectum into colon	5 min
Examination	Scope advanced to cecum (start of colon), then slowly withdrawn while examining	15-30 min
Intervention	Polyps removed, biopsies taken if needed	Variable
Recovery	Rest until sedation wears off	30-60 min

After Colonoscopy

Bloating and gas are normal (air was used to inflate colon)
Walking helps relieve gas
Can usually eat normally after procedure
Avoid driving or making important decisions for 24 hours
Watch for warning signs (see below)
Results discussed before discharge; biopsy results in days

Call your doctor immediately if you experience: severe abdominal pain, fever, significant bleeding (more than a tablespoon), or persistent vomiting after colonoscopy.

⚠️ Risks and Complications

Both procedures are generally very safe, but all medical procedures carry some risk:

Upper Endoscopy Risks

Bleeding: Rare, usually only if biopsy/treatment performed
Perforation: Very rare (<1 in 1000)
Reaction to sedation: Uncommon
Aspiration: Very rare if properly prepared
Sore throat: Common but temporary

Colonoscopy Risks

Bleeding: Occurs in about 1-2% when polyps removed
Perforation: Rare (about 1 in 1000-2000)
Reaction to sedation: Uncommon
Post-polypectomy syndrome: Pain/fever without perforation (rare)
Missed lesions: Small polyps occasionally missed

The risk of complications is far lower than the risk of missing serious conditions like cancer. Colonoscopy screening has been shown to significantly reduce colon cancer deaths.

💊 Sedation Options

Conscious Sedation (Most Common)

Combination of sedative and pain medication (e.g., midazolam + fentanyl)
You're drowsy but can still respond
May not remember the procedure
Recover within 30-60 minutes

Propofol Sedation (Monitored Anesthesia Care)

Deeper sedation, given by anesthesiologist
Faster recovery
No memory of procedure
May be preferred for anxious patients or difficult procedures

Unsedated Colonoscopy

Some patients choose to have colonoscopy without sedation
Can drive yourself home, return to work same day
May have some discomfort during procedure
More common in some countries than others

💊 Capsule Endoscopy

What It Is

A pill-sized camera that you swallow, which takes thousands of pictures as it travels through your digestive system.

When It's Used

Evaluate small bowel (area not reached by standard endoscopy or colonoscopy)
Obscure GI bleeding (when upper and lower endoscopy are normal)
Suspected or known Crohn's disease affecting small bowel
Small bowel tumors
Celiac disease evaluation

The Procedure

Swallow capsule with water
Wear a sensor belt or patches that receive transmitted images
Go about normal activities (avoid strenuous exercise)
Capsule passes naturally in stool (usually within 24-48 hours)
Return equipment; doctor reviews images (often thousands)

Preparation

Clear liquid diet the day before
Fasting overnight
May need bowel prep similar to colonoscopy

Limitations

Cannot take biopsies or treat findings
May not see entire small bowel if transit is fast
Risk of capsule getting stuck in strictures (avoid if known narrowing)

📋 Colon Cancer Screening Guidelines

Risk Level	When to Start	Recommended Tests	Frequency
Average risk	Age 45-50	Colonoscopy OR FIT/FOBT OR stool DNA	Every 10 years (colonoscopy) or annually (FIT)
Family history (first-degree relative)	Age 40 or 10 years before relative's diagnosis	Colonoscopy	Every 5 years
Lynch syndrome	Age 20-25	Colonoscopy	Every 1-2 years
IBD (UC or Crohn's colitis)	8 years after diagnosis	Colonoscopy with biopsies	Every 1-3 years
Previous polyps	Based on findings	Colonoscopy	3-10 years depending on polyp type

Colon cancer is highly preventable through screening. Colonoscopy can find and remove polyps before they become cancer. If you're 45 or older, talk to your doctor about screening options.

❓ Common Questions

Will it hurt?

With sedation, most patients experience no pain and don't remember the procedure. Some may feel mild pressure or bloating. Unsedated colonoscopy can cause discomfort during air inflation or when navigating turns in the colon.

How long does it take?

Upper endoscopy: 10-20 minutes. Colonoscopy: 20-45 minutes. Plan to be at the facility for 2-3 hours total including preparation and recovery.

When can I eat after?

Usually within 1-2 hours after upper endoscopy and immediately after colonoscopy. Start with light foods and progress as tolerated.

When can I return to work?

If sedated, take the rest of the day off. Most people return to normal activities the next day. If unsedated, you may return to work the same day.

What about my medications?

Blood thinners (aspirin, warfarin, clopidogrel) may need to be stopped before the procedure - your doctor will give specific instructions. Most other medications can be taken with a small sip of water. Diabetes medications may need adjustment due to fasting.

Is the bowel prep really necessary?

Yes! A clean colon is essential for an accurate exam. Poor preparation may result in missed polyps or need to repeat the procedure. Follow instructions carefully for the best results.

✅ Procedure Preparation Checklist

Understand the procedure and why it's needed
Review and sign consent forms
Discuss medications with doctor
Arrange transportation (cannot drive after sedation)
Arrange for someone to be with you after
Follow dietary restrictions
Complete bowel prep as instructed (colonoscopy)
Fast as required
Wear comfortable, loose clothing
Bring insurance card and ID
Arrive at scheduled time
Know warning signs to watch for after

GI Tests Overview Breath Tests