The "new" types of colonoscopy aren't replacing traditional ones but are alternatives, mainly Virtual Colonoscopy (CT Colonography), a less invasive CT scan that creates 3D images, and At-Home Stool Tests (like Cologuard), which detect blood and DNA changes in stool. Virtual colonoscopies offer no sedation but can't remove polyps, requiring a follow-up traditional scope if issues are found, while at-home tests offer convenience but less detail than a full colonoscopy.
Virtual colonoscopy also is known as screening CT colonography. Unlike a traditional colonoscopy, which uses a scope put into the rectum and advanced through the colon, virtual colonoscopy uses a CT scan to take hundreds of cross-sectional pictures of the belly organs.
And yes—it's very effective. Virtual colonoscopies can detect polyps, masses, and early signs of colorectal cancer, just like traditional methods. But here's the secret: it's not “either/or.” A Virtual Colonoscopy is an excellent tool for screening and prevention.
Virtual colonoscopy is a special X-ray examination of the colon using low dose computed tomography (CT). It is a less invasive procedure than a conventional colonoscopy. A radiologist reviews the images from the virtual colonoscopy to look for polyps on the inside of the colon that can sometimes turn into colon cancer.
CT colonography may not differentiate stool from artifacts and smaller polyps as well as conventional colonoscopy. CT colonography is not recommended for patients who have active Crohn's disease, ulcerative colitis, inflammatory bowel disease or diverticulitis, because of increased risk of perforating the colon.
You may have some bloating or pain in your abdomen after the test. This is due to the carbon dioxide or air put into the bowel. This should go away shortly afterwards. There is a small risk of a tear (perforation) in your bowel.
Like any other CT procedure, you will be awake while the virtual colonoscopy makes the highly detailed images that doctors use to make a diagnosis. The procedure usually takes less than 30 minutes.
A number of major health insurers cover the procedure. However, because policies differ, check with your health insurance provider to confirm your options. Be aware that Medicare does not yet cover virtual colonoscopy.
Virtual colonoscopy is designed to be easily tolerated by patients. The exam can be completed within twenty minutes, and most patients report that it causes little or no discomfort. To begin, you will lie comfortably on the CT scanner table.
A colonoscopy is the primary colorectal screening test used to check for colon cancer, while a sigmoidoscopy is commonly used to check for causes of rectal bleeding, diarrhea and abdominal pain.
While costs vary based on facility location, technology used, and included services, they generally offer predictable pricing without the surprise charges that can come with traditional procedures. Virtual colonoscopy typically costs between $400 and $1,200 depending on several factors.
CT scans are the best alternative to colonoscopy to investigate bowel cancer. 'Virtual colonoscopy' using CT scans is more effective for investigating patients with possible bowel cancer than an X-ray test, says a new study.
Virtual colonoscopy (VC), also known as CT colonography, is equally effective, less invasive and faster than standard colonoscopy for colon cancer screening. Unlike standard colonoscopy, it does not require sedation. You can drive yourself home after the test and return to normal daily activities.
The radiation dose for a virtual colonoscopy is much less than for a routine CT scan. However, pregnant women should not undergo virtual colonoscopy. The risk of not screening for colorectal cancer is much greater than the radiation risk of a low dose CT scan.
Liquid sodium phosphate products for colonoscopy preparation were removed from the market.
Screening recommendations
The US Preventive Services Task Force (Task Force) recommends that adults age 45 to 75 be screened for colorectal cancer. The decision to be screened between ages 76 and 85 should be made on an individual basis. If you are older than 75, talk to your doctor about screening.
Propofol works quickly; most patients are unconscious within five minutes. "When the procedure is over and we stop the intravenous drip, it generally takes only 10 to 15 minutes before he or she is fairly wide awake again.”
Looping was both more frequent ( P = 0.0002) and less well tolerated in women than in men ( P = 0.0140). Conclusions: This study is the first to document pain at colonoscopy accurately. Looping, particularly in the variable anatomy of the sigmoid colon, is the major cause of pain, especially in women.
Risks and side effects of virtual colonoscopy
You may experience nausea, vomiting, bloating or rectal irritation from the contrast medicine used for the test.
Virtual colonoscopy requires the same preparation as standard colonoscopy. Patients must undergo laxative cleansing and a liquid diet for 24 hours prior to the scan. No sedation is required; the patient is wide awake during the procedure.
There are some common minor side effects, and some very rare but more serious risks such as perforation of the bowel. A CT colonography scan delivers a dose of radiation, but this carries a very low risk. It is possible that, as with colonoscopy, CT colonography scans may miss a polyp or a cancer.
Several people may be in the room during the procedure, including your gastroenterologist, a nurse or two, a technician assisting with the colonoscopy, and an anesthesiologist.
Typical candidates for virtual colonoscopy are patients who are on blood thinners that can't be stopped, and who can't have a colonoscopy because of the risk of bleeding.
I have also performed many thousands of colonoscopies, a small percentage of which have not used sedation. I am a firm believer that unsedated colonoscopy is a safe and effective approach that is vastly underutilized.