Assessment, Diagnosis and Clinical Reasoning
What this domain tests
Structured history taking, targeted physical assessment, recognition of red flags, selection of valid outcome measures, and transparent reasoning toward a working diagnosis and referral decision.
Core rules
- Start with the presenting complaint, then screen systems and red flags before treatment.
- Generate a differential list, then test it deliberately rather than collecting findings randomly.
- Choose outcome measures that are valid for this population and repeatable for this setting.
- Reassess after intervention; a working diagnosis can be revised.
- Record the reasoning: findings, interpretation, plan, and safety advice given.
Worked example
An adult with acute low back pain reports saddle numbness and difficulty starting urination after a fall. Those are red flags for cauda equina compression. The correct reasoning is to stop the musculoskeletal assessment, check perineal sensation and lower limb power, and arrange emergency referral and imaging. Starting traction or massage because the pain 'feels muscular' is the failure of reasoning the exam rewards you for avoiding.
Traps that cost marks
- Anchoring on the first diagnosis and ignoring later contradictory findings.
- Accepting self-reported normal observations without measuring them.
- Treating before screening for red flags.
- Recording a diagnosis with no supporting findings.