Four Reasons To Avoid CT Colonography
If you've ever had a colonoscopy, you know that the prep is the worst part. You have to
drink a liquid laxative. And the taste… Well. Words fail.
And you have to drink LITRES of it!
But all that is in the past now, according to the Mayo Clinic. Doctors there have developed a new laxative in pill
Unfortunately, there's a catch. And it's a HUGE catch.
So here's fair warning… Don't fall for it.
Reading the fine print
As I've mentioned before, there are two ways to screen for colon cancer. One is colonoscopy, which uses a camera
probe. The other is CT colonography (CTC). Here's how a Mayo Clinic press release describes this procedure… "A CT
scan is used to provide three-dimensional imaging."
This is also known as "virtual colonoscopy." It's touted as more appealing because it's non-invasive.
Now… Here's the catch. The new laxative pills can only be used for CTC.
Hmmm. Does that seem odd to you? Did Mayo Clinic researchers really make a laxative that's precisely ideal for CTC,
but not suitable for colonoscopy?
Apparently they did. And the solution to this "mystery" is pretty obvious.
The new laxative was developed by the Mayo Clinic Department of Radiology in Arizona, in the US. This is the same
team that pioneered CTC. They conducted the first studies. They were also the first to offer it for routine
Clearly, the Mayo team would like to see this technology take the lead as the first choice in colon cancer
On the surface, there's nothing wrong with that. Business is business. New technologies overtake outmoded
technologies all the time.
But in fact, there are four BIG things wrong here.
1) CTC may not be as accurate as colonoscopy at spotting smaller polyps. And spotting polyps is kind of the whole
reason you're there in the first place.
2) If doctors find a polyp with colonoscopy, in most cases they remove it during the procedure. But if a CTC scan
finds a polyp, the patient has to return for a colonoscopy.
3) CTC is supposedly non-invasive. But before it begins, they pump air into your bowels... and for some it may feel
like they are blowing off the bed. Not pleasant.
4) This one is the deal-breaker… A CTC delivers an enormous single dose of radiation. It's 400 times stronger than
a chest x-ray.
The Mayo press release downplays or completely ignores these significant drawbacks. Meanwhile, the chair of the
Radiology Department delivers this sales pitch regarding the new laxative…
"Our hope is that this will make people less anxious and more likely to get screened and will ultimately result in
fewer deaths from colorectal cancer."
Translation: Do it OUR way and lives will be saved.
Well… As long as the massive radiation dose doesn't cause any cancers. (Fingers crossed!)
Here's the bottom line. This radiological method is potentially very dangerous. Don't let your doctor talk you into
this procedure with FOUR major drawbacks.
And besides… How long can it be before laxative pills are available for colonoscopy prep? I would guess the
know-how is already available. But don't count on the Mayo radiation department to help out with that.