CAQ-Peds common mistakes
CAQ-Peds · Understand the traps and how to avoid them.
Choosing a single reassuring vital sign or a normal-looking general appearance to close a febrile infant case, instead of applying the full age-banded sepsis evaluation (rectal temperature, appearance, WBC/ANC, urinalysis, and CSF where indicated).
Candidates anchor on the well-appearing child and skip the age stratification that actually drives the decision; the youngest infants have subtle presentations and the highest risk of serious bacterial illness, so the exam deliberately makes the general appearance reassuring.
What to do instead
Before answering any infant fever item, write the patient's exact age in days/months, then state which evaluation pathway that band requires and which test results are mandatory versus optional. Commit the principle that younger age lowers the threshold for full workup and empiric antibiotics, and practice sorting cases into <28 days, 1-3 months, and older.
Treating the developmental milestone question as a yes/no screen and picking reassurance, when the stem describes a clear regression or loss of a previously acquired skill.
Regression is a red flag that candidates mentally file under 'variation' because the child still does many things well; the exam exploits the tendency to focus on preserved skills rather than the lost one.
What to do instead
Adopt a rule: any loss of language or social milestones, especially after 18-24 months, prompts urgent evaluation for autism spectrum disorder, hearing loss, and neurodegenerative or epileptic encephalopathy, not watchful waiting. On every milestone item, list what the child has lost before deciding.
Initiating ADHD pharmacotherapy in a preschool-aged child before documenting a trial of behavioral parent training and confirming impairment across at least two settings.
The stimulant option feels definitive and candidates jump to it, forgetting that guidelines sequence behavioral therapy first for young children and that cross-setting impairment is part of the diagnostic threshold.
What to do instead
For any ADHD item under age 6, default to parent training/behavioral intervention as first-line and choose medication only when that fails or impairment is severe. For all ages, verify symptoms in more than one setting and that they predate age 12.
Missing the non-accidental trauma pattern: selecting a benign explanation for injuries that are non-ambulatory (bruising in a pre-cruising infant, metaphyseal corner fractures, posterior rib fractures) or inconsistent with the stated mechanism.
Candidates want to accept the caregiver's history and avoid the uncomfortable conclusion; the exam presents a plausible-sounding mechanism so the pattern, not the story, must drive the answer.
What to do instead
Memorize the 'those who don't cruise rarely bruise' rule and the injury-mechanism mismatch list. When any of these appear, choose the option that includes a full skeletal survey, retinal exam, and mandated reporting rather than the option that simply treats the injury.
Managing acute asthma with only a short-acting beta-agonist and discharge, omitting systemic corticosteroids and reassessment after treatment.
The rapid improvement after albuterol is seductive, and candidates underweight the underlying inflammation that predicts relapse within days.
What to do instead
For moderate-to-severe exacerbations, pair repeated bronchodilator therapy with early systemic corticosteroids, oxygen to target saturation, and a documented reassessment; reserve discharge for children who sustain improvement. Also confirm the child is on controller therapy and has an action plan.
Applying adult resuscitation drug doses, energy settings, or compression ratios to a pediatric arrest, or forgetting weight-based dosing entirely.
Adult algorithms are overlearned and surface automatically under time pressure; the exam includes a specific weight or age precisely to test whether the candidate converts to pediatric parameters.
What to do instead
Drill the pediatric-specific numbers: compression-to-ventilation ratios for one versus two rescuers, defibrillation at 2 J/kg then 4 J/kg, epinephrine at 0.01 mg/kg of the 0.1 mg/mL concentration, and a length-based tape for dosing. Rehearse a fixed sequence so the weight always triggers a calculation step.
Reading a growth chart as a single point and diagnosing failure to thrive or obesity from one measurement, instead of interpreting the trend and crossing of major percentile lines.
The stem supplies one plotted value and candidates react to the absolute percentile rather than the trajectory, which is what the chart is designed to reveal.
What to do instead
Always ask what the previous measurements were and whether centiles are being crossed upward or downward. Treat a drop across two major centile lines or a sustained fall in weight-for-length as the abnormal finding, and correlate with mid-parental height and growth velocity before labeling.
Selecting a live attenuated vaccine for a child with significant immunodeficiency, high-dose steroid exposure, or pregnancy, instead of the inactivated alternative.
Routine immunization schedules are memorized as a list, so candidates pick the familiar vaccine without checking the host's immune status against the live/attenuated distinction.
What to do instead
Before answering any vaccine item, classify the product as live attenuated or inactivated and classify the host as immunocompetent or immunocompromised. Live agents are contraindicated in the latter; choose the inactivated or subunit option and note that household contacts may still be vaccinated in most cases.
Ignoring the newborn screening result or treating a positive screen as a diagnosis, rather than selecting confirmatory testing and early intervention.
Candidates either dismiss the screen because the infant looks well or jump straight to treatment; the correct response is a defined confirmatory pathway with time-sensitive follow-up.
What to do instead
For each screened condition, know the confirmatory test (repeat newborn screen, specific biochemical or genetic testing, audiology, pulse oximetry) and the urgency. The answer that combines prompt confirmation with avoidance of unproven therapy is usually correct; never choose 'reassure and recheck at the next well visit' for a critical congenital screen.
Failing to adjust drug dosing and choice for age-specific pharmacokinetics and contraindications, such as giving tetracyclines or aspirin to young children, or using an adult milligram dose in a toddler.
Candidates recall the indication and the drug class but not the pediatric restriction, and the distractors are pharmacologically plausible.
What to do instead
Build a short contraindication list by age (tetracyclines and dental staining, aspirin and Reye syndrome, codeine and ultrarapid metabolizer risk, fluoroquinolone caution) and always compute mg/kg against a stated weight, checking the maximum adult dose ceiling.