I had a colonoscopy in 2002, was fine, no pylops or anything, had one recently, couldn't complete due to narrow passage. dr did microscopic test of stool and found blood. what could this mean?

Need more evaluation: At this point your doc will order a second test to complete the colonoscopy. This may be an enema with contrast that will show your colon on x-ray film or a ct scan with contrast in your bowel. With the findings on your second scope, your doc must make sure your colon is really okay. Good job in getting scoped.

Needs evaluation: If your colon evaluation was incomplete and you have heme positive stools you need your complete colon evaluated either with barium enema, helical ctscan, or repeat colonoscopy (using a pediatric scope, perhaps a general anesthetic, and make sure you have an experienced gastroenterologist or colon and rectal surgeon do your procedure.).

Need to find out: It means you are bleeding from your intestine, possibly your colon. This could be due to benign causes like diverticula disease or due to cancer. If a colonoscopy can't be done a barium enemy should be considered or a virtual colonoscopy. Any of these can help identify the cause of bleeding and better assess the narrowing you have.