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Colon Cancer

What is a Good Colonscopy Prep?



I keep hearing doctors referring to a good colonscopy prep. What constitutes a good colonscopy prep? Most take the laxitive have brownish liquid stools and get the procedure. I have had at least 4 colonscopys and never had a perfectly clear stool. So how is the determination arrived at? Thanks.


A good colonoscopy prep allows the physician to see the lining of the colon easily without having to wash away a lot of stool. Usually when the colonoscopy prep is good, the stool that is coming out is a clear liquid or light yellow, similar in appearance to urine. If the stool coming out is brown, even if it's a liquid, chances are the prep is not good.

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Response by:

Julia Gore Thornton, MD Julia Gore Thornton, MD
Assistant Professor of Medicine
School of Medicine
Case Western Reserve University