What is chromoendoscopy?    

Chromoendoscopy involves the use of blue dye sprayed into the colon to help the physician view polyps and abnormal tissue changes that would otherwise be difficult to see during a regular colonoscopy. The dye helps to highlight the surface and edges of the polyps. The dye is not permanent. 

What should I expect during chromoendoscopy?    

Plan to spend up to 2 ½ hours at the endoscopy center. The exam itself will take up to 1 hour. The physician will insert a spray catheter through the colonoscope during your procedure and will spray a portion or your entire colon with some dye. If the physician sees any abnormal tissue, he/she will take a biopsy at that site.   

What should I expect after chromoendoscopy?    

You may notice blue discharge in the toilet after your procedure. This is normal. The dye can stain clothing and sheets, so you may wish to bring protective under garments for your comfort.  

What are possible complications of chromoendoscopy?   

There are no known complications of chromoendoscopy other than those associated with the colonoscopy itself.