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Colonoscopy

A colonoscopy is a procedure that allows a gastroenterologist to examine the colon and rectum. It can help screen for colorectal cancer, find colon polyps, and evaluate symptoms such as rectal bleeding, bowel changes, diarrhea, anemia, or abdominal discomfort. Through the GastroDoxs GutDefense Pathway™, patients receive clear guidance from screening education to procedure planning and follow-up care.

Dr. Bharat Pothuri Medically Reviewed by Dr. Bharat Pothuri, MD, FACG  |  Updated 03-24-2026
What to Expect Download Free Guide
Screening Polyps Prevention

What Is a Colonoscopy?

A colonoscopy is a procedure that uses a thin, flexible tube with a camera to look inside the colon and rectum. It helps doctors check the lining of the colon for polyps, inflammation, bleeding, abnormal tissue, and signs of colorectal cancer.

A colonoscopy may be recommended as a routine screening test or as part of an evaluation for ongoing digestive symptoms.

Understanding Colonoscopy

A colonoscopy helps your GI doctor see the inside of your colon directly. If polyps or abnormal tissue are found, your doctor may remove or sample them during the procedure when appropriate.

Why Is a Colonoscopy Done?

A colonoscopy may be done to screen for colorectal cancer, evaluate digestive symptoms, or monitor known colon conditions. The USPSTF recommends colorectal cancer screening starting at age 45 for average-risk adults, and colonoscopy is one screening option that can help detect colon polyps, bleeding, inflammation, or early signs of colorectal cancer.

Routine colorectal cancer screening

Screening can help find colon polyps or cancer before symptoms appear.

Family history of colon cancer or polyps

Some patients need screening earlier or more often based on family history.

Rectal bleeding or blood in stool

Colonoscopy can help identify possible bleeding sources in the colon or rectum.

Changes in bowel habits

Ongoing diarrhea, constipation, or new bowel pattern changes may need evaluation.

Unexplained iron-deficiency anemia

A colonoscopy may help check for hidden bleeding or other colon-related causes.

Follow-up after previous colon polyps

Patients with prior polyps may need repeat colonoscopy based on results and risk.

What Can a Colonoscopy Detect?

A colonoscopy gives your doctor a detailed view of the colon lining and can help identify several digestive health concerns. As part of the GastroDoxs GutDefense Pathway™, this exam supports early detection, screening awareness, and clearer next steps for long-term digestive health.

Colon polyps

Polyps are growths in the colon lining. Some types may become cancerous over time if not removed.

Colorectal cancer

Colonoscopy can help detect colorectal cancer and is commonly used as a screening test.

Inflammation

It may show inflammation related to conditions such as ulcerative colitis or Crohn’s disease.

Bleeding sources

The procedure may help locate causes of visible or hidden bleeding in the lower digestive tract.

Diverticulosis

Colonoscopy can show small pouches in the colon wall and other structural findings.

Abnormal tissue

If needed, tissue samples may be taken and sent for lab review to guide the next step.

Colon Cancer Screening Alternatives

Colonoscopy is one option for colorectal cancer screening. Other screening methods may include stool-based tests, such as FIT or stool DNA testing, and imaging-based options such as CT colonography. These tests may be appropriate for some average-risk adults, but abnormal results often require a follow-up colonoscopy.

Who May Need a Colonoscopy?

Your doctor may recommend colonoscopy based on age, symptoms, family history, previous polyps, abnormal stool testing, or other risk factors.

Adults due for screening

Many adults need colorectal cancer screening even when they feel well.

Personal history of polyps

Prior colon polyps may require future monitoring based on pathology and risk.

Family history of colorectal cancer

Family history can change when screening should begin and how often it is repeated.

Concerning bowel symptoms

Bleeding, ongoing bowel changes, anemia, or unexplained weight loss may need evaluation.

Abnormal stool test

A positive stool-based screening test may lead to colonoscopy for direct evaluation.

IBD monitoring

Some patients with inflammatory bowel disease may need colon monitoring over time.

Is Colonoscopy Only for Cancer Screening?

No. While colonoscopy is widely used for colorectal cancer screening, it can also help evaluate symptoms, diagnose inflammation, find bleeding sources, identify polyps, and guide the next step in care.

Benefits of Colonoscopy

A colonoscopy can provide important information about colon health and may help prevent future problems by finding certain changes early.

Helps detect colorectal cancer early

Can identify and remove colon polyps

Helps evaluate unexplained digestive symptoms

Allows tissue samples when needed

Provides a direct view of the colon lining

Helps guide the next step in care

Possible Risks of Colonoscopy

A colonoscopy is generally safe when performed by trained GI specialists, but like any medical procedure, it may have risks. These can include bleeding, reactions to sedation, or rarely, a tear in the colon wall. Your gastroenterologist reviews your health history, medications, and reason for the procedure before recommending colonoscopy.

When Should You Talk to a GI Specialist?

Talk to a gastroenterologist if you are due for colorectal cancer screening or if you have rectal bleeding, blood in the stool, persistent bowel habit changes, unexplained anemia, unexplained weight loss with digestive symptoms, or new abdominal pain with bowel changes.

Related Colonoscopy Guides

Use these next-step pages when you are ready to understand preparation, scheduling, or related digestive conditions.

What to Expect

Learn about preparation, procedure day, sedation, recovery, and results.

Schedule Colonoscopy

Review appointment, location, insurance, and scheduling details.

Colon Polyps

Learn how colon polyps are found, removed, and reviewed.

Colon Cancer

Understand colorectal cancer risk, screening, and evaluation.

Rectal Bleeding

Review when bleeding may need GI evaluation.

Change in Bowel Habits

Learn when bowel pattern changes may need evaluation.

Colonoscopy Prep Overview

Quick Answer: What should adults know about colonoscopy prep?

Colonoscopy prep helps your gastroenterologist see the colon clearly during the procedure. It usually includes temporary diet changes, a bowel-cleansing medicine, medication review, and planning for someone to drive you home after sedation.

GastroDoxs will provide detailed prep instructions before your colonoscopy. Follow the instructions closely, and call the office if you are unsure about what to eat, when to take your prep, or which medications to adjust.

Colonoscopy Video Instructions

Watch this overview in the bottom half of the page, then follow the written instructions from your GastroDoxs care team for your exact prep timing, medication guidance, arrival time, and transportation plan.

Where to Learn the Next Step

Want procedure-day details? Review the full guide for bowel prep, sedation, procedure-day expectations, recovery, and how results are discussed. Read what to expect during colonoscopy.
Ready to discuss screening? If you are due for screening or have symptoms that may need evaluation, use the scheduling page to understand appointment options. See colonoscopy scheduling options.

Frequently Asked Questions

What is a colonoscopy used for?

A colonoscopy is used to examine the colon and rectum. It may help screen for colorectal cancer, detect colon polyps, evaluate bleeding, and understand ongoing bowel symptoms.

Is colonoscopy only needed if I have symptoms?

No. Many adults need colonoscopy for routine colorectal cancer screening even if they do not have symptoms. It may also be recommended earlier if you have risk factors or concerning symptoms.

Can colon polyps be found during a colonoscopy?

Yes. A colonoscopy can help identify colon polyps. In many cases, polyps may be removed during the procedure and sent for lab review.

When should I ask a doctor about colonoscopy?

You should ask a doctor about colonoscopy if you are due for colorectal cancer screening, have a family history of colon cancer, had previous polyps, or have symptoms such as rectal bleeding or ongoing bowel changes.

Is colonoscopy a diagnostic procedure?

Yes. Colonoscopy can be used for screening and diagnosis. It may help doctors evaluate symptoms, detect inflammation, identify bleeding sources, and guide the next step in care.

What is the difference between a screening colonoscopy and a diagnostic colonoscopy?

A screening colonoscopy is usually done to look for polyps or colorectal cancer before symptoms appear. A diagnostic colonoscopy is done to evaluate symptoms or abnormal test results.

What does colonoscopy help prevent?

Colonoscopy can help prevent some colorectal cancers by finding and removing certain precancerous polyps before they have a chance to become cancer.

Wondering If You Need a Colonoscopy?

If you are due for screening or have ongoing bowel symptoms, a digestive health specialist can help you understand whether colonoscopy is the right next step. Through the GastroDoxs GutDefense Pathway™, patients receive clear education, screening guidance, and next-step support before scheduling.

Learn What to Expect See Scheduling Options