## Virtual Colonoscopy: A Non-Invasive Way to Examine Your Colon
**Introduction**
A virtual colonoscopy, also known as CT colonography, is a non-invasive medical test that allows doctors to examine the inside of the large intestine (colon) and rectum without using a traditional colonoscope. It uses X-ray technology and computer software to create a virtual image of your colon.
**Procedure**
Before the test, you may need to:
* Fast for several hours
* Drink a contrast agent (liquid) to help highlight the colon
* Receive an enema to clean out the colon
During the test:
* You will lie on a CT scanner table
* Air will be pumped into your colon through a thin tube inserted into the rectum
* The CT scanner will rotate around you, taking X-ray images
* A computer will process the images to create a virtual image of your colon
**Diagnosis**
A virtual colonoscopy can help identify conditions and diseases such as:
* **Colorectal polyps:** Growths on the surface of the colon that can turn cancerous
* **Colorectal neoplasia:** Abnormal growths that can develop into cancer
* **Colorectal adenoma:** Small polyps that can grow into cancer if not removed
* **Irritable bowel syndrome (IBS)**
* **Inflammatory bowel disease (IBD)**, including Crohn’s disease and ulcerative colitis
* **Diverticular disease:** Diverticula (small pouches) in the colon that can become inflamed or infected
* **Appendicitis:** Inflammation of the appendix
**Importance**
Virtual colonoscopies are important for early detection and prevention of colon cancer. Regular screening tests can help find and remove pre-cancerous polyps before they turn into cancer. They are also less invasive and more comfortable than traditional colonoscopies.
**Alternatives**
Other tests that can examine the colon include:
* **Traditional colonoscopy:** A flexible tube is inserted into the rectum to examine the colon
* **Sigmoidoscopy:** A shorter tube is used to examine only the lower part of the colon
* **Fecal immunochemical test (FIT):** A home test that checks for hidden blood in the stool
**Preparation**
To prepare for a virtual colonoscopy, your doctor will provide specific instructions, which may include:
* Fasting for 8-12 hours
* Following a low-fiber diet
* Drinking a contrast agent
* Receiving a laxative or enema
**Duration**
The test usually takes around 15-20 minutes, but preparation and recovery time can add an additional hour or two. You will typically get the results of the test within a few days.
**Recommendations**
If you are at average risk of colon cancer, you should start getting a virtual colonoscopy or a traditional colonoscopy at age 45. If you have a family history of colon cancer or other risk factors, your doctor may recommend earlier or more frequent screening. After an initial virtual colonoscopy, your doctor will recommend the best follow-up schedule based on your results.
