Colonoscopy

What is a Colonoscopy?

A colonoscopy is a medical procedure that lets a doctor look inside the colon (large intestine) using a long, flexible tube with a camera on the end. It checks for abnormalities such as polyps, inflammation, bleeding, or cancer.

Key Findings (what the doctor looks for)

Why is it done?

• Routine screening for colorectal cancer in people 45 years and older or with a family history.
• Evaluation of symptoms such as abdominal pain, rectal bleeding, unexplained weight loss, or chronic diarrhea.
• Monitoring of known conditions like inflammatory bowel disease or previously removed polyps.

Early detection

A colonoscopy can help identify signs of colorectal cancer or precancerous polyps, but it does not diagnose on its own. A doctor interprets the findings together with symptoms, history, and other tests.

What an abnormal result may mean

• A polyp may be benign or precancerous.
• Inflammation could indicate inflammatory bowel disease.
• A tumor may be benign or malignant.
• Bleeding sources could be due to ulcers, diverticulosis, or cancer. Many factors such as diet, medications, or recent infections can influence findings.

Who might be advised to get one?

• Adults 45+ years old, especially with a family history of colorectal cancer.
• Individuals with symptoms like rectal bleeding, unexplained abdominal pain, or chronic diarrhea.
• Patients with a history of polyps or inflammatory bowel disease.

Quick summary

A colonoscopy is a safe, detailed way to look inside the colon, helping doctors spot problems early and guide appropriate treatment.

Preparation

• Fasting: No fasting is required for a colonoscopy. However, you should follow any specific instructions from your doctor, especially if you are having other tests that require fasting.
• Diet: Start a low‑residue or clear liquid diet 24–48 hours before the procedure. Avoid foods that are high in fiber, nuts, seeds, popcorn, and tough meats.
• Bowel prep: Take the prescribed laxative solution (often polyethylene glycol) the day before. Follow the exact dosage and timing given by your clinician.
• Medications: Continue most medications, but stop aspirin, NSAIDs, or anticoagulants as advised by your doctor.
• Hydration: Drink plenty of clear fluids (water, clear broth, tea, black coffee) during the prep period, but avoid alcohol.
• Procedure: The colonoscope is inserted through the rectum and advanced through the colon. The entire exam usually takes 20–40 minutes, plus time for any biopsies or polyp removal.
• Discomfort: You may feel bloating, cramping, or mild pressure. Sedation is often used, so you may not feel the procedure itself.
• Aftercare: You will be monitored until the sedative wears off. You may feel groggy or have a mild headache. Avoid driving or operating heavy machinery for 24 hours.

Always confirm your specific preparation instructions with your doctor or the lab. This information is general educational content and not a substitute for professional medical advice.