GP · core-skills
Clinical reasoning, bias, and diagnostic uncertainty
Also known as Clinical reasoning · Diagnostic uncertainty · Cognitive bias in medicine · Diagnostic error
GP-fellowship guide to clinical reasoning, bias and diagnostic uncertainty: dual-process theory (System 1/System 2), the cognitive biases that cause diagnostic error (anchoring, premature closure, availability, diagnostic momentum), gut feeling as a diagnostic tool (OR 4.24 for cancer), safety-netting structure, cognitive forcing strategies, and the premature closure experimental evidence showing 61% reduction in diagnostic accuracy.
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Red flags
- Premature closure is the commonest cause of diagnostic error — once you have a label, actively seek evidence that contradicts it before committing
- Diagnostic momentum kills: a label acquired from a referral letter or previous clinician sticks even when your own findings contradict it
- Gut feeling that something is seriously wrong warrants action even when you cannot name the diagnosis — pooled OR 4.24 for cancer when GPs record gut feelings
- Safety-net every uncertain diagnosis: name the working diagnosis, list specific return triggers, book a review date — every time
Overview
Clinical reasoning is the process by which clinicians move from a patient's presentation to a diagnosis and management plan. Most of the time it works. When it fails, patients are harmed. The GP's task is to understand how reasoning goes wrong and build habits that catch errors before they cause harm. [1]
References5ShowHide
- [1]Croskerry P Cognitive forcing strategies in clinical decisionmaking. Ann Emerg Med, 2003.PMID 12514691
- [2]Croskerry P, Singhal G, Mamede S Cognitive debiasing 2: impediments to and strategies for change. BMJ Qual Saf, 2013.PMID 23996094
- [3]Smith CF, Drew S, Ziebland S, Nicholson BD Understanding the role of GPs' gut feelings in diagnosing cancer in primary care: a systematic review and meta-analysis of existing evidence. Br J Gen Pract, 2020.PMID 32839162
- [4]Robles LA, Abel GA, Black GB, Hamilton W, King A, et al. 'One of the hardest things in medicine is challenging an initial diagnosis': interim diagnoses and missed opportunities for diagnosing cancer in primary care, a qualitative study. Br J Gen Pract, 2026.PMID 41991222
- [5]Al Essa A, Schmidt HG, Mamede S, Knežević K, Zwaan L, Magzoub M Premature closure underlies bias in medical diagnosis in students: A randomised controlled experiment. Med Educ, 2026.PMID 42051011