Colonoscopy Treatment

Colonoscopy is a test used to detect changes in the large intestine (colon) and rectum.

During a colonoscopy treatment, a long, flexible tube (colonoscope) is inserted into the rectum. A tiny video camera on the edge of the tube enables the doctor to explore the entire inside of the colon.

If needed, polyps or other types of foreign tissue can be removed through the scope during a colonoscopy procedure. Tissue samples (biopsies) may be taken during a colonoscopy as well.

Why Colonoscopy Treatment is being done?

Your doctor may recommend a colonoscopy to:

  • Search for any signs and symptoms of gastrointestinal conditions. Colonoscopy procedure help the doctor explore potential causes of abdominal pain, rectal bleeding, chronic constipation, chronic diarrhea and other intestinal problems.
  • Screening for colon cancer. If you are 45 or older and have an average risk of colon cancer — age is the only your risk factor for colon cancer — your doctor may recommend a colonoscopy every 5 years or if you had positive fecal occult blood test taken on two or three consecutive days. Colonoscopy is an option for screening for colon cancer.
  • Explore more appendices. If you previously had polyps, your doctor may recommend a colonoscopy for follow-up and to investigate and eliminate polyps. This procedure is done to reduce the risk of colon cancer.


Colonoscopy poses few risks. Rarely, complications from colonoscopy may include:

  • Adverse reaction to the sedative used during the test
  • Bleeding from the site where a tissue sample (biopsy) was taken or the site that removed a polyp or other abnormal tissue.
  • Tear in the colon or rectal wall (perforation)
How to prepare

Before a colonoscopy procedure, you will need to clean (empty) your colon. Any residue in your colon may block the view of your colon and rectum during the examination.

To empty your colon, your doctor may ask you to:

  • Follow a special diet the day before the test. You usually won’t be able to eat solid food the day before the test. Drinks may be limited to clear liquids – plain water, tea and coffee without milk or cream, beef soup, and soft drinks. Avoid red fluids, which may be confused with blood during a colonoscopy. You may not be able to eat anything after midnight the night before the exam.
  • Take a laxative. Your doctor will usually recommend a laxative in tablet or liquid form. You may be directed to take a laxative medicine the night before your colonoscopy, or you may be asked to use a laxative both the night before and the morning of the procedure. Since you may experience explosive diarrhea, it is recommended to drink clear liquids up to three hours before your exam to prevent dehydration.

Adjust your medications. Remind your doctor of your medications at least a week before the examination – especially if you have diabetes, high blood pressure, heart problems, or if you take medications or supplements that contain iron.

Also inform your doctor if you are taking aspirin or other blood-thinning medications, such as warfarin (Coumadin, Jantoven); Newer anticoagulants such as dabigatran (Pradaxa) or rivaroxaban (Xarelto), which are used to reduce the risk of macular clots or stroke; Or heart medications that affect platelets, such as clopidogrel (Plavix).

You may need to adjust your dose or stop taking the medications temporarily.

What you can expect

During the Colonoscopy Treatment:

You will wear a medical shirt during the colonoscopy, and most likely you will not wear another. Anesthesia (Sedation) is usually recommended. Sometimes a mild anesthetic is given in pill form. In other cases, anesthesia is given in combination with an IV pain reliever to reduce any discomfort.

The examination begins with lying on your side on the examination table, usually with your knees closed toward your chest. The doctor inserts a colonoscope into the rectum.

The endoscope – long enough to reach anywhere in the colon – contains a torch and a tube (channel) that allows the doctor to pump air or carbon dioxide into the colon. Colon air or carbon dioxide is inflated; This gives the doctor a better view of the colon lining.

If the scope is moved or the air is pumped out, you may feel cramping or an urgent need to have a bowel movement.

The colonoscope also has a tiny camera on its head. The camera sends the images to an external monitor, which enables the doctor to examine the inside of the colon.

A doctor may also insert tools through the canal to take tissue samples (biopsies) or remove polyps or other foreign tissue.

The colonoscopy takes between 30 and 60 minutes.

After the Colonoscopy Procedure:

It takes about an hour to begin to recover from the anesthetic after the test. You will need someone to take you home because it can take up to a day for the full effects of the drug to wear off. So, don’t drive, make any important decisions, or go back to work all day.

If your doctor removes a polyp during a colonoscopy, he or she may recommend that you follow a special diet temporarily.

You may feel bloated or want to pass gas for a few hours after the test due to the emptying of air inside the colon. Walking may help relieve discomfort.

You may also notice a small amount of blood when you first have a bowel movement after the test. Usually this is not a cause for concern. Consult your doctor if you continue to have a bowel movement accompanied by blood or blood clots or if you have persistent abdominal pain or fever. Although not likely, it may happen immediately or in the first few days after the procedure, but it may be delayed for up to one to two weeks.


Your doctor will review the results of your colonoscopy and then share them with you.

Negative Result:

Colonoscopy is considered negative if the doctor finds no effects of colonic disorder.

Your doctor may also recommend another colonoscopy:

  • Within 5 years, if you have an average risk of colon cancer – you have no colon cancer risk factors other than age
  • Within two years, if you had a history of colon polyps during previous colonoscopy
Positive Results:

A colonoscopy is positive if the doctor finds any polyps, polyps, or abnormal tissue in the colon.

Most polyps are not cancerous (hyperplasia), but some can be precancerous (adenoma). Polyps removed during colonoscopy are sent to a laboratory for analysis to determine whether they are cancerous, precancerous, or non-cancerous.

You may need to follow a stricter monitoring schedule in the future to look for more polyps, depending on the size and number of polyps.

If your doctor finds one or two polyps (adenomas) less than 0.4 inches (1 centimeter) in diameter, he or she may recommend a repeat colonoscopy within two years, depending on your risk factors for colon cancer.

Your doctor will recommend another colonoscopy sooner if you have:

  • More than two polyps (adenomas)
  • One large polyp – greater than 0.4 inch (1 centimeter)
  • Polyps and also stool remaining in the colon prevents a full colon examination
  • Polyps with distinct cells that indicate a greater risk of cancer in the future
  • Cancerous lesion

If a cancerous lesion is planned to be removed endoscopically, it is usually excised by the technique called ESD (endoscopic submucosal dissection), which is exclusively performed under in-patient setting.

Problems with the test:

If the doctor is concerned about the quality of the endoscopic presentation, he or she may recommend a repeat of the colonoscopy or shortening the recommended period for this test to be repeated. If the doctor cannot insert the endoscope through the entire colon, it may be best to perform a barium enema or virtual colonoscopy (CT-colonoscopy) to examine the rest of the colon.

Japanese Board-certified Gastroenterological Surgeon








-結腸がんのスクリーニング。 45歳以上で、結腸がんの平均リスクがある場合(年齢が結腸がんの唯一の危険因子)、医師は5年ごとに結腸内視鏡検査を勧めるか、2日あるいは3日法による便潜血検査が陽性であった場合。結腸内視鏡検査は、結腸がんのスクリーニングのためのオプションです。



結腸内視鏡検査はほとんどリスクをもたらしません。 まれに、結腸内視鏡検査による合併症には以下が含まれる場合があります。





結腸内視鏡検査の前に、結腸をきれいにする(空にする)必要があります。 結腸に残留物があると、検査中に結腸が見えなくなる可能性があります。


-テストの前日は特別食を摂ってください。 通常、試験の前日に固形食を食べることはできません。 飲み物は透明な液体に限定される場合があります-普通の水、ミルクやクリームを含まないお茶とコーヒー、牛肉のスープ、ソフトドリンク。 結腸内視鏡検査中に血液と混同される可能性のある赤い液体は避けてください。 試験前夜の深夜以降は何も食べられません。















検査後、麻酔薬から回復するまで約1時間かかります。 薬の効果が完全になくなるまでに最大1日かかることがあるため、家に連れて帰る人が必要になります。 ですから、運転したり、重要な決定をしたり、その日のうちに仕事に戻ったりしないでください。


結腸内に空気を入れるため、膨満感を感じたり、検査後数時間ガスが出る場合があります。 歩くことは不快感を和らげるのを助けるかもしれません。

また、検査後に最初に排便したときに少量の血液に気付く場合があります。 通常、これは心配する必要はありません。 血液や凝血塊を伴う排便が続く場合、または腹痛や発熱が続く場合は、医師に相談してください。 可能性は低いですが、すぐに、または検査後の最初の数日で発生する可能性がありますが、最大1〜2週間遅れることがあります。





















内視鏡検査の質が心配な場合は、大腸内視鏡検査を再度行うか、次回検査までの期間を短くすることをお勧めします。 医師が結腸全体に内視鏡を挿入できない場合は、バリウム注腸検査または仮想結腸内視鏡検査(CT結腸内視鏡検査)を行って残りの結腸を検査する場合があります。

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