What are options when colonoscopy prep is too much to bear?
DEAR DR. ROACH: I am a 72-year-old male in good health. I've had a couple of colonoscopies (the first one found some adenomas), but the required cleansing prep with harsh laxatives has become increasingly difficult for my body to take. I only got halfway into the last prep before becoming so sick that I had to discontinue the cleansing and cancel the colonoscopy.
I've been reading about new noninvasive colon cancer detection methods that do not require the harsh prep. Two of them are Cologuard, which analyzes stool samples, and Epi proColon, a blood test. What is your opinion of these?
I realize that they test only for evidence of cancer and that a positive test would call for a colonoscopy, but could they serve as screening tests? Would a negative result mean I could reasonably skip a colonoscopy and its (for me) debilitating prep procedure? -- B.W.
ANSWER: I recommend colonoscopy as the first-line screening test for colon cancer, as it evaluates the entire colon and allows for a biopsy to be done at the same time. However, colonoscopy is expensive, has risks of side effects, sometimes can miss small polyps, isn't available everywhere and isn't definitively proven to be better than other methods (though most experts think it is, and nearly all choose it for themselves). The preparation is, at best, unpleasant, and some people find it hard.
For people who cannot or will not get a colonoscopy, three options include fecal blood testing, the Cologuard stool DNA test and the Epi proColon blood DNA test. These tests have never been compared against each other, but most authorities feel the Cologuard test and stool blood test are likely more sensitive tests than the blood-based proColon DNA test. However, any of these tests is better than not getting screened at all.
People with a positive test, and people at high risk for colon cancer due to history or medical condition still should have a colonoscopy. Finally, you might ask your gastroenterologist about different preparation options: Some are much better tolerated than others.
The booklet on colon cancer provides useful information on the causes and cures of this common malady. Readers can obtain a copy by writing:
Book No. 505
628 Virginia Dr.