Call Us

Contact Us

What to Expect During a Colonoscopy Screening

Healthcare worker speaking with an elderly couple

Colonoscopy screenings are vital for the early detection and prevention of colorectal cancer, one of the most common and deadly cancers worldwide. If you’re scheduled for a colonoscopy screening or considering one in the near future, understanding what to expect during the procedure can help ease any anxiety and ensure a smooth experience.

In this comprehensive guide, we will walk you through the various aspects of a colonoscopy screening, from preparation to recovery, to help you feel informed and prepared.

Colonoscopy Screening

Colonoscopy screening is a medical procedure that involves the examination of the inner lining of the large intestine (colon) and rectum using a long, flexible tube called a colonoscope. This tube is equipped with a camera and light source, allowing the healthcare provider to visualize the colon’s entire length and identify potential abnormalities such as polyps or early signs of colorectal cancer.

Importance of Colonoscopy Screening

Colonoscopy screenings are essential for the early detection and prevention of colorectal cancer. They play a crucial role in identifying and removing precancerous polyps before they have the chance to develop into cancer, which can significantly improve outcomes and save lives.

Preparing for Your Colonoscopy Screening

  • Consultation with Your Healthcare Provider. 
Before scheduling a colonoscopy screening, you will typically have a consultation with your healthcare provider. During this consultation, you can discuss your medical history, any medications you are currently taking, and any concerns or questions you may have about the procedure.
  • Dietary Restrictions. In the days leading up to your colonoscopy screening, you will be instructed to follow specific dietary restrictions. This often includes a clear liquid diet and the avoidance of certain foods like nuts, seeds, and high-fiber items.
  • Bowel Preparation. The most crucial aspect of preparing for a colonoscopy is bowel preparation. This involves taking a prescribed laxative solution to cleanse your colon thoroughly. The goal is to ensure the colon is clear and free of stool, allowing for a clear view during the procedure.
  • Medication Adjustments. 
If you are taking any medications, especially blood thinners or anticoagulants, your healthcare provider may provide specific instructions on whether to adjust or temporarily stop these medications before the procedure.
  • Arrange Transportation. You will need someone to drive you to and from the colonoscopy appointment, as the sedatives used during the procedure can impair your ability to operate a vehicle safely.

The Day of Your Colonoscopy Screening

  • Arrival at the Medical Facility. 
On the day of your colonoscopy screening, you will arrive at the medical facility where the procedure will take place. You will need to check in with the reception desk and complete any necessary paperwork.
  • Change into a Hospital Gown. 
You will be asked to change into a hospital gown and remove any jewelry or accessories. This helps ensure a hygienic and safe environment for the procedure.
  • Intravenous (IV) Line. An IV line will be inserted into your arm to administer medications and fluids during the procedure. This allows the healthcare team to keep you comfortable and relaxed throughout the colonoscopy.
  • Monitoring. 
You will be continuously monitored by healthcare professionals, including nurses and an anesthesiologist, if necessary, to ensure your safety during the procedure.

The Colonoscopy Procedure

  • Sedation or Anesthesia. 
Before the colonoscopy begins, you will receive sedation or anesthesia to help you relax and minimize discomfort. The level of sedation can vary, from mild relaxation to deeper sedation or anesthesia, depending on your needs and preferences. Some people may choose to be awake and alert during the procedure, while others prefer a deeper level of sedation.
  • Colonoscope Insertion. Once you are comfortably sedated, the gastroenterologist will gently insert the colonoscope into your rectum and advance it through the colon. The camera at the tip of the colonoscope transmits images to a monitor, allowing the healthcare provider to examine the colon’s lining in real-time.
  • Visualization and Inspection. The colonoscope is carefully maneuvered through the colon, allowing the healthcare provider to inspect the entire length of the organ. If any polyps or abnormalities are detected, they can be visualized and assessed for removal or biopsy.
  • Polyp Removal. During the colonoscopy, if polyps or growths are identified, they can be removed using specialized instruments passed through the colonoscope. This is a crucial aspect of colonoscopy screening, as it can prevent these precancerous polyps from developing into colorectal cancer.
  • Biopsy. 
If the healthcare provider observes any suspicious tissue or abnormalities, they may take tissue samples (biopsies) for further analysis. Biopsies can help determine the nature of the abnormality and guide treatment if necessary.
  • Air Insufflation. To provide better visualization of the colon’s lining, a small amount of air is introduced into the colon during the procedure. This can cause a sensation of fullness or gas, but it is a normal part of the process.
  • Procedure Duration. The duration of a colonoscopy screening can vary but typically lasts between 30 minutes to an hour, depending on the complexity of the examination and any interventions required.

After the Colonoscopy Screening

  • Recovery Area. 
After the colonoscopy, you will be moved to a recovery area where you can wake up from the sedation or anesthesia. You will be monitored closely by healthcare professionals during this time to ensure your safety.
  • Post-Procedure Discussion. 
Once you are fully awake and alert, the gastroenterologist will discuss the findings of the colonoscopy with you. They will explain whether any polyps were removed, biopsies were taken, or if everything appeared normal. If biopsies were taken, you may need to wait for the results, which will be discussed with you in a follow-up appointment.
  • Diet and Activity. 
You will be allowed to gradually reintroduce clear liquids and a light diet, depending on your comfort level and any specific instructions from your healthcare provider. It’s essential to stay hydrated after the procedure. You may also be advised to avoid heavy lifting or strenuous activities for the rest of the day.
  • Discharge Instructions. Before leaving the medical facility, you will receive detailed discharge instructions. These instructions may include dietary recommendations, medication instructions (especially regarding any adjustments made before the procedure), and what to watch for in the hours following the colonoscopy.
  • Transportation Home. 
Since the effects of sedation or anesthesia can linger for several hours, you must have someone available to drive you home. Do not plan to drive or operate heavy machinery on the day of the procedure.
  • Resuming Normal Activities. 
Most people can return to their normal activities, including work, the day after the colonoscopy. However, it’s essential to follow any specific guidance provided by your healthcare provider regarding your recovery.


Colonoscopy screenings are a vital tool in the early detection and prevention of colorectal cancer, a disease that can be effectively treated when caught in its early stages. While the procedure may seem intimidating, understanding what to expect during a colonoscopy screening can help alleviate any concerns.

Remember that the benefits of colonoscopy, including the potential detection and removal of precancerous polyps, far outweigh the associated risks and temporary discomfort. If you have concerns or questions about the procedure, don’t hesitate to discuss them with your healthcare provider. By following the recommended screening guidelines and maintaining a healthy lifestyle, you can take proactive steps to protect your colorectal health and overall well-being.

Introducing Curasia Endoscopy Centre

Our host, Jerald Foo, will be taking you to our first centre at Jurong East.

Make An Enquiry

Leave us your details and we’ll get back to you shortly.
Prefer to talk? Call our clinic directly to make an enquiry at +65 6679 1229

or Whatsapp us at +65 9750 8783

We are available 24 hours

Let's Get in Touch!

Clinic Details

Other Related Articles

Curasia Endoscopy

Call Us

Contact Us