Management after a positive fecal immunochemical test and a nonexplanatory colonoscopy: a scoping review and practical decision framework

Key Takeaways for GI Nurses

• A positive FIT followed by a colonoscopy that shows no cancer or advanced neoplasia is common, but there is no single agreed-upon term or definition for this scenario—this scoping review proposes "nonexplanatory colonoscopy" as a standardized label that nurses should become familiar with in patient education and documentation.
• Colonoscopy quality metrics (such as bowel prep adequacy, cecal intubation, and withdrawal technique) are directly tied to residual CRC risk after a nonexplanatory exam—reinforcing the nurse's critical role in pre-procedure bowel prep counseling and intra-procedure quality support.
• Patients with a nonexplanatory colonoscopy may need additional evaluation beyond the colon (e.g., upper GI or other extracolonic workup) and clear guidance on when/how to re-enter routine screening—nurses are often the first point of contact for these follow-up questions.
• Because management pathways are poorly standardized across institutions and screening programs, GI nurses can play a key role in advocating for and implementing consistent, evidence-informed follow-up protocols within their units.

Clinical Relevance

For endoscopy nurses working in FIT-based colorectal cancer screening programs, this scoping review addresses a scenario encountered routinely: the patient who tests positive on FIT, undergoes colonoscopy, and receives a "normal" or "unremarkable" result with no cancer or advanced adenoma identified. Historically, there has been no consistent terminology or protocol for what happens next, leaving both clinicians and patients uncertain about residual risk, need for further testing, and timing of re-entry into screening. By synthesizing evidence into a decision framework and standardized definition, this review gives nursing teams a shared vocabulary and evidence base to support patient counseling, reduce anxiety, and improve continuity of care across the screening pathway.

From an operational standpoint, the review's emphasis on colonoscopy quality as a driver of residual CRC risk reinforces long-standing nursing priorities: reinforcing bowel prep instructions, verifying prep adequacy before the procedure, and supporting endoscopists in achieving complete cecal intubation and adequate withdrawal times. When a colonoscopy is deemed nonexplanatory, nurses are often tasked with communicating next steps to patients—whether that means additional imaging, gastroenterology referral for extracolonic evaluation, or a defined timeline for repeat screening. Having a practical, evidence-based framework to reference during these conversations can reduce variability in messaging and improve patient confidence in the care plan, particularly when patients ask, "Why did I test positive if nothing was found?"

This review also has implications for professional development and quality improvement initiatives. Endoscopy units may use these findings to audit their own definitions and protocols for nonexplanatory colonoscopy, ensuring alignment with emerging standards. Nurses involved in screening program coordination, patient navigation, or quality metrics tracking can leverage this framework to identify gaps in follow-up documentation or re-entry scheduling, ultimately supporting more consistent, guideline-concordant care across diverse practice settings.

Bottom Line

When a positive FIT leads to a colonoscopy that finds no cancer or advanced neoplasia, GI nurses should recognize this as a distinct clinical scenario—now termed "nonexplanatory colonoscopy"—that carries residual risk and requires deliberate follow-up, not simple reassurance; understanding this emerging framework equips nurses to better support colonoscopy quality, guide patient counseling, and advocate for standardized re-entry protocols within their screening programs.