Top 20 Most Examined Topics in FRCEM

Topic priority at a glance

The highest-yield FRCEM topics are not simply the commonest ED presentations. They are the areas where UK guidance gives clear thresholds, timings, escalation points, and disposition decisions. That makes them ideal for single best answer questions and highly relevant to day-to-day emergency practice.

For exam purposes, the most tested topics usually share three features:

• they are common in the ED
• they are strongly guideline-driven
• they contain a clear best next step

For clinical practice, these same topics matter because they are the presentations where delayed recognition, wrong sequencing, or poor safety-netting causes harm.

Guidance changes. Candidates should always cross-check current NICE, RCEM, Resuscitation Council UK, BTS, SIGN, and relevant specialty guidance. The themes and thresholds below reflect mainstream UK emergency medicine practice and the style in which these areas are commonly examined.

Why These Most Examined Topics Matter for FRCEM

These are the 20 topics most likely to generate marks across MRCEM SBA, FRCEM SBA, and FRCEM OSCE:

Key Definitions

For exam purposes, know the difference between:

• initial management and definitive management
• investigation of choice and first investigation
• observation and admission
• senior review and specialty referral
• guideline threshold and local variation

Also separate:

• adult and paediatric criteria
• anticoagulants and antiplatelets
• clinical possibility and best guideline-concordant answer

Essential Pathophysiology

The most examined ED topics are usually those where pathophysiology explains urgency:

• intracranial bleeding after head injury
• spinal instability after trauma
• occult serious bacterial infection in febrile children
• circulatory collapse in sepsis and haemorrhage
• hypoxia and ventilatory failure in asthma and COPD
• cerebral ischaemia in stroke
• myocardial ischaemia in ACS
• ongoing neuronal injury in status epilepticus
• ketosis, dehydration, and electrolyte disturbance in DKA
• hepatic injury after paracetamol overdose

Examiners often test whether you understand which physiological change creates the immediate threat and therefore determines the next step.

Clinical Presentation

High-yield presentations include:

• minor head injury with one key risk factor
• trauma with possible cervical spine injury
• febrile infant or toddler with one red or amber feature
• agitated patient requiring behavioural disturbance management
• major trauma with hypotension or pelvic injury
• chest pain with non-diagnostic initial ECG
• sudden focal neurology or transient neurological symptoms
• ongoing seizure activity despite first-line treatment
• breathless patient with severe asthma or possible PE
• vomiting, abdominal pain, and acidosis in diabetes
• overdose with uncertain timing
• child with bronchiolitis, croup, or wheeze
• vulnerable child with inconsistent injury history
• haematemesis or melaena with shock
• thunderclap headache or fever with meningism
• pregnant patient with pain and bleeding
• acute scrotal pain

Red Flags and High-Risk Features

Across these topics, repeatedly tested red flags include:

• reduced or deteriorating GCS
• focal neurological deficit
• physiological instability
• age-specific paediatric abnormal observations
• anticoagulation
• pregnancy
• immunosuppression
• very young age, especially under 3 months
• failure of first-line treatment
• safeguarding concerns
• need for transfer to specialist centre

Differential Diagnosis

FRCEM questions often look like one topic but test another. Common examples:

• head injury stem actually testing safeguarding or anticoagulation
• agitation stem actually testing hypoglycaemia, toxicology, or hypoxia
• fever in child stem actually testing meningococcal disease, UTI, or Kawasaki disease
• asthma stem actually testing tension pneumothorax or anaphylaxis
• chest pain stem actually testing aortic dissection or PE
• headache stem actually testing SAH, meningitis, or carbon monoxide exposure

Initial ED Assessment

For almost all high-yield topics, the safe exam approach is:

• ABCDE assessment
• identify immediate life threats
• treat first where appropriate
• apply the relevant decision rule or guideline
• decide on investigation, escalation, and disposition

In OSCEs, candidates lose marks by jumping to definitive diagnosis before showing structured assessment and early treatment.

Investigations

The commonest investigation themes are:

• CT head timing after head injury
• CT cervical spine in significant-risk trauma
• blood cultures and lactate in sepsis where indicated
• ECG and serial troponin in ACS
• CT brain and vascular imaging in stroke pathways
• blood gas in severe asthma, COPD, DKA, and sepsis
• paracetamol level at the correct time point
• D-dimer only in appropriate PE risk groups
• LP only when indicated and safe

The exam trap is over-investigation. If a validated rule says no imaging or no D-dimer, the best answer is often not to do it.

Management in the Emergency Department

The highest-yield management principle is sequencing. Examiners often ask for the next best step, not the whole pathway.

Below is the practical ranked revision core for each of the top 20 topics.

1. Head injury in adults and children

• CT is the acute imaging modality of choice when criteria are met.
• Do not choose skull X-ray in routine acute head injury assessment.
• Keep head injury and cervical spine rules separate.
• Know discharge requirements: responsible supervision, written advice, return precautions.
• Know when deterioration, focal neurology, or abnormal imaging mandates neuroscience discussion.

Typical SBA traps:

• treating aspirin monotherapy as equivalent to anticoagulation
• mixing adult and paediatric vomiting criteria
• choosing MRI or skull X-ray
• forgetting CT timing

2. Cervical spine injury and spinal assessment

• Canadian C-spine Rule applies to alert, stable patients and is not a universal trauma rule.
• High-risk factors: age 65 or over, dangerous mechanism, paraesthesia in extremities.
• Low-risk factors only permit assessment of active neck rotation; they do not clear the neck by themselves.
• If the patient cannot actively rotate the neck 45 degrees left and right, imaging is required.
• In adult significant-risk trauma, CT is usually first-line imaging rather than plain radiographs.
• During airway management, manual in-line stabilisation is the key practical point, while prioritising oxygenation and first-pass success.
• Use spinal motion restriction principles rather than reflex prolonged collar use.

Typical SBA traps:

• using low-risk factors as clearance
• choosing plain films in high-risk adult trauma
• confusing dangerous mechanism lists between head injury and C-spine rules

3. Fever in under 5s

Red features include:

• pale, mottled, ashen, or blue
• reduced response to social cues
• appears ill to a healthcare professional
• does not wake or does not stay awake
• weak, high-pitched, or continuous cry
• grunting
• moderate or severe chest indrawing
• reduced skin turgor
• bulging fontanelle
• neck stiffness
• status epilepticus
• focal neurological signs
• focal seizures
• non-blanching rash

Amber features include:

• pallor reported by parent or carer
• not responding normally to social cues
• no smile
• wakes only with prolonged stimulation
• decreased activity
• nasal flaring
• tachypnoea using age-specific NICE thresholds
• oxygen saturation 95% or less in air
• crackles in the chest
• dry mucous membranes
• poor feeding in infants
• capillary refill time 3 seconds or more
• fever for 5 days or more
• swelling of a limb or joint
• non-weight bearing limb or not using an extremity

• Risk stratification must lead to action: observe, investigate, treat, admit, or discharge with safety-netting.
• Always consider UTI, pneumonia, meningitis, sepsis, meningococcal disease, and Kawasaki disease where relevant.
• Do not use antipyretic response to distinguish serious from non-serious illness.
• Under 3 months with fever is a high-yield admission/escalation group.

Typical SBA traps:

• focusing on temperature alone and missing behaviour or perfusion
• discharging a young infant with fever and no clear plan
• forgetting safety-netting and parental advice

4. Sepsis and septic shock

• Recognise sepsis as life-threatening organ dysfunction due to infection.
• Think source, physiology, and organ dysfunction.
• Use NEWS2 in adults as part of assessment, but do not let a score replace clinical judgement.
• In children, use age-specific observations and concern about appearance, perfusion, and behaviour.
• Take cultures where appropriate, but do not delay antibiotics in septic shock or high-risk sepsis.
• Give oxygen if hypoxic, IV access, bloods, lactate, fluids where indicated, early antimicrobials, and source control planning.
• Escalate early if hypotension, rising lactate, altered mental state, or poor response to initial treatment.

Typical SBA traps:

• treating a score rather than the patient
• delaying antibiotics for imaging
• giving protocol fluids without considering heart failure or renal disease

5. Procedural sedation and the agitated patient

• Know the difference between analgesia, anxiolysis, sedation, and rapid tranquillisation.
• Procedural sedation requires appropriate patient selection, consent where possible, fasti