How Should Gastroenterologists Use AI Without Weakening Clinical Reasoning?

Start with a clinical representation

Before opening an AI tool, summarize the case yourself: age, time course, key symptoms, objective abnormalities, risk factors and discriminating negatives. If the question is poorly framed, the model may produce a polished but irrelevant answer. Clinical reasoning begins with problem representation, not with search.

Use AI for breadth, then humans for probability

A model can quickly generate uncommon causes of diarrhea, liver-test abnormalities or dysphagia. That is useful for avoiding omission, but long differentials are not equivalent to good reasoning. The clinician must rank possibilities by pretest probability and consequences of missing the diagnosis.

Separate retrieval from recommendation

AI summaries can be stale, misquote guidelines or combine recommendations from different populations. For decisions involving medication selection, surveillance intervals, cancer risk or invasive procedures, verify against the current society guideline, primary trial or drug label. Treat unverified AI output as a lead, not a citation.

Use structured contradiction checks

Ask: What evidence would make this diagnosis wrong? What is the dangerous alternative? Does the proposed treatment conflict with renal function, pregnancy, infection risk or another medication? What data are missing? These questions turn AI from an answer machine into a reasoning adversary.

AI in endoscopy is a special case

Computer-aided detection can improve polyp detection, yet 2025 AGA guidance found insufficient evidence that routine CADe reduces colorectal cancer or mortality. That is a useful lesson: better intermediate performance does not automatically prove better patient outcomes.

Protect the learning loop

For trainees, do the case before seeing the model answer. Then compare. If AI always supplies the first differential and management plan, pattern recognition and illness-script development can atrophy. Used after independent reasoning, AI can accelerate feedback and expose blind spots.

A practical clinical approach

1. Write your own one-sentence problem representation first.
2. Ask AI a bounded question rather than 'What should I do?'.
3. Require current primary/society sources for consequential recommendations.
4. Check at least one plausible competing diagnosis and one major contraindication yourself.
5. Use AI output to generate questions and evidence checks, not to transfer accountability.
6. For trainees, reason independently before viewing the model's conclusion.

Common errors to avoid

• Copying an AI differential into the chart without ranking it.
• Citing an AI-generated reference without opening the original source.
• Letting a fluent summary override contradictory clinical data.
• Using an AI endoscopy tool as a substitute for quality metrics and inspection technique.
• Entering identifiable patient information into tools without appropriate institutional privacy controls.

What should trainees remember?

The durable skill is not knowing more facts than an AI system. It is knowing which facts matter, which source to trust, when the evidence does not fit the patient and when the model is confidently wrong.

Free further reading from Dr. Alan B. R. Thomson

Dr. Thomson's Practice Review in Gastroenterology and board/clinical-examination books are particularly relevant because they teach case-based reasoning. AI should be layered onto that reasoning process rather than replacing it.

Frequently asked questions

Can AI be used to make a differential diagnosis?

Yes, as a breadth and omission-checking tool; the clinician must still rank probabilities and decide what evidence is needed.

Should an LLM citation be trusted if it looks plausible?

No. Open and verify the original guideline, trial or publication.

Does AI-assisted endoscopy already prove better cancer outcomes?

No. CADe improves detection, but long-term cancer-prevention evidence remains uncertain.

References

1. Thomson ABR. Practice Review in Gastroenterology. CAPstone Academic Publishers; 2014. ISBN 978-1500855321.

2. Thomson ABR. Mastering the Boards and Clinical Examinations in Internal Medicine: Gastroenterology. CAPstone Academic Publishers; 2016. ISBN 978-1515386636.

3. Sultan S, et al. AGA Living Clinical Practice Guideline on Computer-Aided Detection-Assisted Colonoscopy. Gastroenterology. 2025.

4. Rex DK, et al. Quality Indicators for Colonoscopy. ACG/ASGE. 2024.