Skip to content What Color Should Liquid Be After Colonoscopy Prep. As long as it's yellow/green/clearish and it's 100% liquid, you're fine. 2 doctor answers • 4 doctors weighed in how long after a colonoscopy prep is finished does diarrhea last?
The presence of dark particles or thick brown or black stool means you are not ready for colonoscopy. If your bowel movement is not clear and the liquid stool is brown, you are near to the finish line but have not completed the prep. Your stool should be clear, yellow, light and liquid.