01Principles and purposeThe professional or clinical skill and the decisions it supports.
Integration is the work of making evidence cohere across conversation, observation and examination. The history supplies time course, symptom character, exposures, baseline and the patient's meaning; examination tests physiology and anatomical hypotheses; records and collateral data may verify context. Do not wait until the end to think. After the opening narrative, form provisional mechanisms and use neutral questions to challenge them. Equally, do not let an early hunch dictate every subsequent question. Deliberately seek at least one credible competing explanation and any feature that would demand urgent action regardless of the final diagnosis.
A focused examination is neither a miniature full screen nor a single confirmatory trick. Select observations and systems from the differential. A patient with breathlessness may require respiratory and cardiovascular assessment, fluid status, thromboembolic clues and physiological observations. Explain this scope, obtain consent and adapt to pain, mobility and distress. If a finding conflicts with the history, repeat the technique, check assumptions and widen the hypotheses. Discordance is useful: it may expose timing effects, treatment response, examination limitation, comorbidity or a mistaken initial frame.
Weight evidence rather than counting it. Features differ in reliability, specificity and consequence. An objective focal deficit usually shifts reasoning more than a vague symptom, yet even objective findings depend on technique. Negative evidence deserves scrutiny: absence of fever after antipyretics, absent tenderness after analgesia, or normal auscultation in intermittent disease has limited power. Represent the case in one sentence using relevant patient context, tempo, syndrome, severity and discriminators. Then rank a short differential with one supporting and one opposing or missing feature for each candidate.
The plan must resolve uncertainty safely. Investigations should answer defined questions, and immediate care should address physiology before taxonomy. Tell the patient what the evidence suggests, what it does not establish, and why each proposed step matters. Specify what deterioration should prompt help, when reassessment will occur and who owns results. In PACES the same integration appears as synthesis and discussion; in an SCA-style consultation it also includes agenda, shared planning and feasibility. Feedback should test evidence weighting, patient partnership and closure rather than reward the longest list.
Key points
- Begin with the patient's agenda and an open account, then define chronology, severity, functional change and urgent symptoms before narrowing the enquiry.
- Generate a small set of mechanistic hypotheses during the history and choose examination components that can discriminate among them or detect immediate risk.
- Separate facts from interpretations: symptoms are reported, signs are observed under stated conditions, and diagnoses remain weighted explanations until adequately supported.
- Use meaningful positive and negative findings, but discount a negative when the question, technique, timing or patient ability makes it unreliable.
- Rank serious, likely and treatable alternatives by probability and consequence, then choose investigations that could actually change the ordering or management.
- Close the reasoning loop by summarising to the patient, inviting correction, stating uncertainty, agreeing action and documenting ownership of results and review.
02Situations and prioritiesThe context, relevant information and actions that matter most.
A concise sentence combines relevant context, tempo, syndrome, severity and discriminating findings, making competing mechanisms easier to compare without discarding uncertainty.
A finding that conflicts with the leading hypothesis should prompt technical verification and reframing rather than being ignored as an inconvenient exception.
A negative feature changes probability only when it was sought clearly, the patient could report it reliably and the sign or symptom would reasonably be present.
A less likely diagnosis may still need early exclusion when delay carries major harm, while common benign explanations should not erase physiological warning signs.
Medicines, pregnancy possibility, immune state, occupation, travel, function, care responsibilities and access to follow-up can change probability and plan.
Unowned results, vague deterioration advice or no review interval leave an otherwise plausible differential clinically unsafe.
03Assessment and interpretationHow to gather information, assess the situation and recognise uncertainty.
Consider the information, its meaning and its limitations before deciding what follows.
- 01
Chronological problem representation - Why
- Compress the case into features that influence probability and urgency.
- Interpretation and limitations
- Revise the sentence as new evidence arrives; a representation that still reflects the first impression despite discordant data promotes anchoring.
- 02
Hypothesis-linked examination - Why
- Seek physiological danger and findings that separate the leading mechanisms.
- Interpretation and limitations
- Choose enough breadth to detect an important alternative and state any limited component; a negative poorly performed test should carry little weight.
- 03
Evidence table or verbal comparison - Why
- Make support, conflict and missing information visible for each candidate diagnosis.
- Interpretation and limitations
- Avoid treating all findings equally; quality, timing and consequences determine how much each item should alter the ranking.
- 04
Selected diagnostic testing - Why
- Answer a defined question likely to change management or confidence.
- Interpretation and limitations
- Before ordering, state the expected result under each major hypothesis and what action would follow; this exposes low-value or indiscriminate testing.
- 05
Record and collateral review - Why
- Verify baseline, medicines, prior results and trajectory when these affect decisions.
- Interpretation and limitations
- Identify the source and any discrepancy. Historic labels inform prior probability but should not overwrite current symptoms and examination.
- 06
Teach-back and feasibility check - Why
- Test whether the patient understands and can carry out the plan.
- Interpretation and limitations
- Ask the person to explain actions and warning features, then address transport, caring duties, cost, language or support barriers that could make a nominal plan fail.
04Worked approachesCases with ordered reasoning, an action and a check of the outcome.
01Worked caseIntegrate pleuritic pain and breathlessnessA fictional case supplies sudden pleuritic chest pain after recent leg immobilisation, mild tachycardia, normal chest auscultation, no reproducible chest-wall tenderness and oxygen saturation below the person's documented baseline.+
- 1Recognise the change in oxygenation and sudden symptoms as priority evidence, obtain complete observations and decide whether the patient needs urgent assessment before extending the history.
- 2Represent the case as acute pleuritic chest pain with impaired oxygenation and thromboembolic context, noting that normal auscultation does not explain or exclude the syndrome.
- 3Rank pulmonary embolic disease highly while retaining pneumothorax, infection, cardiac causes and chest-wall pain; use the absence of reproducible tenderness only as modest evidence.
- 4Choose the appropriate acute clinical pathway and probability-based testing rather than ordering unrelated panels, while addressing current physiological needs and explaining why urgent evaluation is proposed.
- 5Verify that all stated facts were supplied, invite the patient to correct the timeline, document escalation and use feedback to examine whether normal auscultation caused false reassurance.
02Reasoning methodUse a three-column differentialSeveral diagnoses remain plausible after initial history and examination.+
- 1For each candidate, list the strongest supporting evidence, the most important conflicting evidence and the decisive information still missing.
- 2Weight each entry for reliability and consequence rather than counting the number of bullets.
- 3Move dangerous time-sensitive alternatives upward when delay matters, even if another diagnosis is statistically more common.
- 4Select the next action that either protects the patient now or most efficiently changes management, then update the representation.
03Consultation closureTurn uncertainty into an owned planNo single diagnosis is confirmed and outpatient investigation is reasonable.+
- 1Explain the leading possibilities in plain language and distinguish what the assessment has found from what remains possible.
- 2Agree the investigation or therapeutic trial, its purpose and the expected timing of information.
- 3Give specific symptom or trajectory triggers for seeking urgent help and identify an accessible route.
- 4Name who will review results and when, check feasibility and understanding, and record any uncertainty or declined option.
05Feedback, follow-up and evidenceReview outcomes, seek feedback and identify what to improve.
- Rewrite the problem representation after important results, response or deterioration so that handovers do not perpetuate an obsolete frame.
- Audit whether planned tests changed probability or management; repeated low-yield testing may reveal poorly specified diagnostic questions.
- Ask supervisors to identify anchoring, premature closure, missing alternatives and unjustified weighting in oral case presentations.
- Confirm that pending results, escalation thresholds and review responsibility are visible to both patient and clinical team.
- Compare actual outcomes with the original differential to calibrate reasoning while avoiding hindsight claims that uncertainty should have been absent.
06Special situationsVariants, exceptions and circumstances that change the usual approach.
Discordance is productive
When history and examination do not match, the mismatch can reveal technique limits, disease timing, treatment effects or an alternative mechanism.
Tests require action links
A proposed investigation is most defensible when the clinician can say how different results would alter treatment, referral or confidence.
Context changes safe choices
The same probability can lead to different plans when follow-up access, frailty, pregnancy, safeguarding or treatment risk differs.
Diagnosis is not closure
Even a plausible label needs severity assessment, patient explanation, ownership and a contingency for an unexpected course.
Feedback should inspect weighting
Reviewing only the final diagnosis misses whether the learner used reliable discriminators and protected against serious alternatives.
07Common pitfallsFrequent interpretation and management errors.
- 01
Collecting a complete history and full examination as separate performances without allowing either to reshape the other.
- 02
Counting supportive features while ignoring one high-quality discordant observation.
- 03
Using a normal single examination finding to exclude an intermittent or poorly sensitive disease process.
- 04
Producing an exhaustive unranked differential that gives no indication of risk, probability or next action.
- 05
Ending with 'safety-netted' in the record without documenting concrete triggers, route, time and responsibility.