What Happens During a Colonoscopy?

A colonoscopy involves an internal screening of your digestive tract. Dr. Stephen Buto is a skilled gastroenterologist in Honolulu, HI. Read on to learn more about this procedure.

What Is a Colonoscopy?

A colonoscopy is a procedure in which a thin tube with a tiny camera attached to the end of it, called an endoscope, is inserted into the rectum. The endoscope allows your physician to examine what's going on internally in your colon.

Is It Painful?

A colonoscopy is not painful at all. At most, you may experience a small amount of discomfort, usually described as "a sense of pressure" during this procedure.

Why Would I Need a Colonoscopy?

The main reason to get a colonoscopy is for cancer screening. It is recommended as part of routine screenings every 5 years or so beginning at the age of 45. The frequency of the recommendation of this test may increase or decrease depending on the results of the test. Several subsequent negative tests will result in a need for decreased frequency of this procedure.  

A colonoscopy can also be a therapeutic measure, not just preventive or diagnostic. This procedure is sometimes used to remove suspicious-looking tissue. During a colonoscopy, your doctor can remove polyps and other blockages, inject medication, and put stents in place.

Reasons to have a colonoscopy for diagnostic purposes in Honolulu, HI are:

  • Age 45 or over
  • Rectal bleeding
  • Changes in bowel habits or appearance of stool
  • Chronic constipation or diarrhea
  • Chronic abdominal pain
  • Unexplained weight loss

How Do I Prepare for This Procedure?

An empty stomach and intestines are preferred. In the case of colonoscopy, you will be required to abstain from solids for the day before the procedure and asked to only consume light-colored liquids such as lemon or lime Gatorade, jello, apple juice, and water. You also may be asked to take a laxative the day or night before your procedure.

What Does the Procedure Consist Of?

You may be given a mild sedative before the procedure so that you are barely aware in real time of what is happening, and won't remember much of anything afterwards. A mild anaesthetic will also be administered. This procedure is quite short, around 15 minutes, and performed on an outpatient basis. You will go home the same day and there is no need to spend a night in the hospital. However, we do recommend that you have someone else drive you home since you will still be under the effects of the anesthesia for up to a day after the procedure.

Contact Us

Schedule your colonoscopy in Honolulu, HI with Dr. Buto. You can reach our office by calling (808) 524-7676.

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Stephen K. Buto, M.D.


9:00 am-12:00 pm

2:00 pm-4:30 pm


9:00 am-12:00 pm

2:00 pm-4:30 pm


9:00 am-12:00 pm


9:00 am-12:00 pm

2:00 pm-4:30 pm


9:00 am-12:00 pm

2:00 pm-4:30 pm





Patient Testimonials

  • "Thank you very much for your efficient and professional caring to take care of my colon health."
  • "Thank you so much for taking the time to meet with me to address my concerns and to perform the procedures. Your warm bedside manner and compassion were greatly appreciated! I am very thankful to have someone so thorough investigating my symptoms. Thank you!!!"
  • "Many thanks for a job well done. It was a huge relief going through the ordeal. Your easy going, soft sell of the procedure was a big help. It helped to put things in perspective and allowed me to be less apprehensive. Your efficient team worked swiftly and well. We are fortunate to have such up-to-date facilities and trained staff. We are very fortunate to have such fine medical care."
  • "Thank you for the extra special care you gave my dad during his recent gall bladder episode. My family and I truly appreciate your attention to dad’s case, your kindness, compassion, thoroughness, being there in the middle of the night, communication with the family, and just the heart with which you serve. I wish there were more doctors like you. God bless and keep you and your family."
  • "I can’t thank you enough for the extraordinary effort you went through to help me reach a conclusive diagnosis. You went over and beyond any expectation, and I thank you from the bottom of my heart for all the time and effort. My mind is at ease that I had the expertise of you and your colleagues to help me."
  • "Thank you for service above and beyond on a long Saturday afternoon, when my husband was in so much pain. It was very comforting to know that you were just a phone call away. We needed your instructions and advice, and it kept him from a hospital stay."
  • "Thank you for your wonderful expertise and care."
  • "It has been one week since my first colonoscopy. Thank you so much that the entire process and procedure went so smoothly. The time and effort in providing a thorough pre-consultation and explanation relieved me of my anxiety and concerns. The communication and follow through by your office was very helpful and appreciated! I sincerely appreciate your kind attention and excellent medical care in the successful accomplishment of my procedure"
  • "Thank you so much for your attentive and thorough care. I appreciate your acknowledging my anxiety over the anesthesia. And your attempt to alleviate it. It worked beautifully!!!"
  • "I have had my second procedure with Dr. Buto and Dr. Leong in 10 years. They and their staff were the most professional and courteous people that I have ever met. Everything was explained to me as to what was going to happen for prep, the procedure and after the procedure. I would highly recommend Dr. Buto, Dr. Leong and their staff."