Colonoscopy: Preparation, Procedures, and What to Expect - Gastroenterology and Hepatology

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Could you please provide more details about the colonoscopy examination in gastroenterology?


Do I need to get an injection for a colonoscopy in the gastroenterology department? How many injections will I receive? Will the injection be administered in my buttocks? Do I need to change into a gown? What type of gown should I wear? What position will I be in during the examination? Will a nurse hold my body and legs to prevent me from moving? Do both gastroenterology and colorectal surgery departments perform colonoscopies? Is it possible to use an enema for bowel preparation on the day of the examination instead of taking the oral laxative solution?

Anxin, 40~49 year old female. Ask Date: 2011/11/30

Dr. Chen Qifeng reply Gastroenterology and Hepatology


Hello: Currently, colonoscopy procedures involve the administration of pre-procedural medications, which may be given via intramuscular or intravenous injection, depending on the institution.
The use of these medications has specific effects, indications, and contraindications, and adjustments will be made based on individual cases prior to the examination.
As for changing into appropriate examination attire, the position during the procedure, and other precautions, please follow the instructions provided by the medical staff.
Additionally, the choice of bowel preparation medications may vary based on the institution and the clinical condition of the patient.
Wishing you good health, Dr.
Chi-Feng Chen, Taoyuan Hospital, Department of Health.

Reply Date: 2011/11/30

More Info


Colonoscopy is a vital procedure used to examine the inner lining of the colon and rectum. Understanding the preparation, procedure, and what to expect can help alleviate anxiety and ensure a smooth experience.
Preparation for Colonoscopy:
1. Dietary Restrictions: In the days leading up to the procedure, you will be advised to follow a low-fiber diet. This typically includes avoiding whole grains, nuts, seeds, and raw fruits and vegetables. The day before the colonoscopy, you will need to switch to a clear liquid diet, which includes broth, clear juices, and gelatin.

2. Bowel Cleansing: The most crucial part of preparation is bowel cleansing. This is usually done with a prescribed laxative solution that you will need to drink the day before the procedure. This solution helps to clear the intestines of any stool, allowing for a clearer view during the colonoscopy. Some patients may prefer an enema or a series of enemas as an alternative, but this should be discussed with your doctor beforehand.

3. Medications: You may be instructed to stop certain medications, especially blood thinners, a few days prior to the procedure. Always consult your healthcare provider regarding your current medications.

The Procedure:
1. Sedation: Most patients receive sedation to help them relax and minimize discomfort during the procedure. This is typically administered through an IV, and the level of sedation can vary from mild to deep sedation. You will not be awake during the procedure, but you may be able to respond to verbal cues.

2. Attire: You will be asked to change into a hospital gown. This gown is designed for easy access during the procedure and is typically open at the back. You should wear comfortable clothing to the facility, as you will change into the gown upon arrival.

3. Positioning: During the colonoscopy, you will lie on your left side with your knees drawn up towards your chest. This position helps the doctor maneuver the colonoscope more easily through the colon.

4. Assistance: Nurses will be present to assist you throughout the process. They may hold your body in place gently to ensure you remain still during the examination, which is essential for accurate results.

5. Duration: The entire procedure usually takes about 30 minutes to an hour, depending on the findings and whether any additional procedures, such as polyp removal or biopsies, are performed.

Post-Procedure Expectations:
1. Recovery: After the procedure, you will be monitored in a recovery area until the sedation wears off. You may feel groggy and will need someone to drive you home.

2. Discomfort: Some patients experience mild cramping or bloating after the procedure, which is usually temporary. It is advisable to rest for the remainder of the day.

3. Diet: You can typically resume a normal diet after the procedure unless instructed otherwise by your doctor.

4. Follow-Up: Your doctor will discuss the findings with you after the procedure and provide any necessary follow-up care or additional testing if needed.

Alternative Methods:
While the standard preparation involves drinking a laxative solution, some patients inquire about alternatives like using enemas. It is essential to discuss this with your healthcare provider, as they can guide you on the most effective and safe preparation method for your specific situation.

In conclusion, understanding the colonoscopy process, from preparation to recovery, can significantly reduce anxiety and improve the overall experience. Always communicate openly with your healthcare provider about any concerns or preferences you may have regarding the procedure.

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