ABPS Psychiatry common mistakes
ABPS Psychiatry · Understand the traps and how to avoid them.
Choosing the single 'most correct-sounding' answer without first ranking the plausible options against the specific stem qualifier (e.g., 'first step', 'most likely', 'next best'), so an answer that is true in general but wrong for the asked task gets selected.
Under time pressure candidates pattern-match to a familiar fact and stop reading the stem's operative word, and several options are deliberately true statements about the disorder rather than answers to the question asked.
What to do instead
Before looking at options, underline the operative word in the stem and restate the question in your own words; then eliminate any option that is true but does not answer that exact task, and only then pick among survivors.
Labeling a patient with a personality disorder or 'characterological' problem when the presentation is better explained by a mood, psychotic, substance, or medical condition, because the first vivid interpersonal impression anchors the formulation.
Dramatic or difficult ward behaviour is memorable and emotionally salient, and trainees underweight base rates and the rule that personality diagnosis requires longitudinal, cross-situational evidence.
What to do instead
Apply the hierarchy explicitly: exclude substance/medical causes, then active mood or psychotic illness, before considering a personality disorder; require evidence of the trait pattern being stable and present outside episodes and across settings.
Prescribing or continuing a medication combination without checking the specific pharmacodynamic or pharmacokinetic interaction (e.g., serotonergic load, QT prolongation, CYP450 inhibition raising a narrow-therapeutic-index drug), relying instead on general familiarity with each drug alone.
Drugs are learned individually, interaction tables are memorized as lists rather than mechanisms, and the clinically relevant interaction is often a second-order effect (an inhibitor raising a substrate) rather than a direct pairwise warning.
What to do instead
For every regimen, name the mechanism of each interaction: additive receptor effect, additive QT effect, or metabolic inhibition/induction with the specific enzyme and substrate; if you cannot state the mechanism, treat the combination as unsafe until verified.
Managing an agitated or suicidal patient in the emergency setting by moving straight to disposition or to a single risk score, without first completing the reversible-cause and immediate-safety steps (vitals, glucose, tox screen, focused neuro exam, means restriction, observation level).
Disposition pressure and the pull to 'sort' the patient dominate, and risk-assessment tools create false reassurance that the medical workup is complete.
What to do instead
Use a fixed sequence every time: stabilize and rule out delirium/intoxication/withdrawal and medical causes, quantify risk with explicit protective and aggravating factors documented, then decide least-restrictive safe disposition, and state the observation and means-restriction plan.
Attributing new cognitive or behavioural change in an older adult to dementia or to 'normal aging' without screening for delirium and its precipitants (infection, medication, metabolic, pain, sensory deprivation, retention).
Baseline cognitive impairment is assumed to explain the change, and delirium is under-recognized when the patient is quiet rather than agitated.
What to do instead
For any acute or fluctuating change, apply a delirium screen (e.g., CAM-style attention and fluctuation assessment), review the medication list and recent changes, and order the standard precipitant workup before accepting a dementia explanation.
Treating a child or adolescent presentation as an adult disorder transplanted downward, ignoring developmental stage, informant discrepancies, and the requirement for symptoms to be pervasive across settings and impairing relative to developmental norms.
Adult-trained knowledge is over-applied, single-informant histories are accepted, and normal developmental variation (e.g., transient fears, oppositionality) is pathologized or missed.
What to do instead
Gather multi-informant, multi-setting history (parent, teacher, child), anchor symptoms to developmental expectations and duration/impairment criteria, and state explicitly how the developmental context changes the differential and the plan.
Answering forensic or ethics items with the clinically 'helpful' choice rather than the legally correct role obligation (e.g., breaching confidentiality to warn without the jurisdictional duty framework, or letting treating-clinician loyalty override an evaluator's neutrality).
Clinical training rewards advocacy and alliance, and candidates conflate the treating role with the evaluator role or assume one national legal standard.
What to do instead
Before answering, name your role (treater vs. evaluator vs. expert) and the governing principle (informed consent, confidentiality and its exceptions, duty-to-protect statutes, competence/voluntariness); choose the option consistent with that role and note jurisdictional variation where relevant.
Missing substance withdrawal or substance-induced psychiatric syndromes because the history is taken as reported and a positive screen for one substance closes the diagnostic question.
Patients underreport, polysubstance use is common, and withdrawal timelines and presentations overlap with primary anxiety, mood, and psychotic disorders.
What to do instead
Take a structured substance history including quantity, last use, and prior withdrawal; apply the timeline of the relevant withdrawal syndrome; and defer a primary psychiatric diagnosis until the substance-induced window has resolved, documenting the reasoning.
Describing a psychotherapy approach at the level of a slogan ('use CBT') instead of specifying the mechanism, target, structure, and indication that distinguish it from alternatives in the stem.
Modalities are memorized as labels, and exam items test discriminative features (e.g., behavioral activation vs. cognitive restructuring, transference interpretation vs. supportive work) rather than brand names.
What to do instead
For each modality, be able to state its proposed mechanism, its target symptom or process, its typical structure and stance, and the clinical features that favor it; when an item names a technique, identify the theory it belongs to before choosing.
Answering neuroscience and basic-science items by recalling a fact in isolation, without linking it to the clinical phenomenon the stem describes (e.g., naming a neurotransmitter without connecting it to the receptor, circuit, or syndrome in the vignette).
Basic science is studied separately from clinical material, so the candidate retrieves a term but cannot map it onto the described deficit or drug effect.
What to do instead
Practice two-way mapping: for each core mechanism (e.g., a circuit, receptor system, or sleep architecture feature), state the clinical syndrome it explains and the drug class that acts on it; in the exam, work from the vignette's clinical feature to the mechanism rather than free-associating a fact.