The CPN (Certified Pediatric Nurse) is a nursing certification awarded by PNCB.
PNCB publishes the official exam outline, eligibility rules and fees — see PNCB's official page before you book.
Twenty CPN (Certified Pediatric Nurse) questions, with the answers hidden until you want them — covering Pathology, Management, Assessment, Basics and more. They are real cards from our 1060-card deck, not the 30 on the free preview page, so you can use both. Work through them cold, then use your score below to decide what to study next. PNCB publishes the official exam outline — check it for the real blueprint.
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A 10-month-old with FTT is prescribed a high-calorie formula. The nurse is educating the parents on caloric density. What is the standard target for formula fortification in FTT, and what is a primary safety concern?
Show answer →The target is usually 24 to 30 kcal/oz (standard formula is 20 kcal/oz). Safety concern: Osmotic load and renal solute load. Increasing density too rapidly can cause diarrhea or dehydration. Education: Parents must follow specific mixing instructions exactly—adding too little water can cause hypernatremic dehydration, while too much water dilutes essential nutrients. Exam Tip: If a child isn't gaining weight on 20 kcal/oz, the next step is often increasing density rather than volume to avoid gastric distention.
What is the priority nursing intervention for an infant with bronchiolitis who is exhibiting mild intercostal retractions, nasal congestion, and poor oral intake?
Show answer →The priority is maintaining airway patency via frequent nasal suctioning (especially before feeding) and ensuring adequate hydration. Clinical Reasoning: Infants are obligate nose breathers; nasal congestion directly increases work of breathing and interferes with the ability to suck and swallow. CPN exams emphasize least invasive first—suctioning and positioning (elevating the head of the bed) are prioritized before escalating to IV fluids or oxygen unless the patient is severely distressed.
During a 2026 well-child visit, a mother asks about RSV prevention for her healthy 2-month-old infant born at 39 weeks. According to current standards, what is the recommended immunoprophylaxis?
Show answer →Per 2026 standards, Nirsevimab (Beyfortus), a long-acting monoclonal antibody, is recommended for ALL infants under 8 months of age entering their first RSV season. Unlike Palivizumab, it is not restricted to high-risk groups. CPN Exam Strategy: Distinguish between Palivizumab (monthly, high-risk only) and Nirsevimab (single dose, all infants). This is a frequent new knowledge target on modern exams. Nirsevimab provides passive immunity for approximately 5 months to cover a standard RSV season.
A severely ill infant with RSV is receiving IV fluids for dehydration. Why is it critical for the CPN to monitor for fluid overload and hyponatremia in this specific patient?
Show answer →Severe bronchiolitis can trigger the non-osmotic release of Antidiuretic Hormone (ADH), leading to a state similar to SIADH (Syndrome of Inappropriate Antidiuretic Hormone). This increases the risk for water retention and dilutional hyponatremia. CPN Strategy: When IV fluids are necessary for bronchiolitis, isotonic solutions (like Normal Saline) are preferred over hypotonic solutions to prevent iatrogenic hyponatremia. Monitor strict I&Os, daily weights, and neurological status.
Why is Dexamethasone considered the gold standard for the management of mild to severe Croup (LTB) in pediatric clinical pathways?
Show answer →Dexamethasone is a long-acting corticosteroid (half-life 36-72 hrs) that reduces subglottic edema by inhibiting inflammatory mediators. Evidence shows it reduces ED return rates, the need for epinephrine, and hospital length of stay. Dose: 0.6 mg/kg (max 16mg) via PO, IM, or IV. Exam Tip: PNCB often asks about standard of care—Dexamethasone is now indicated for even MILD croup (Score 1-2) to prevent progression.
7yo with sudden onset high fever (104F), chills, and pleuritic chest pain. Chest X-ray shows a dense consolidation in the right lower lobe. Which pathogen is most likely responsible?
Show answer →Streptococcus pneumoniae. Rationale: S. pneumoniae is the most common cause of community-acquired bacterial pneumonia (CAP) in children. Key features include abrupt onset, high fever, and focal (lobar) consolidation on CXR. Pleuritic chest pain is common in bacterial cases due to pleural irritation. Exam Tip: Bacterial = Focal/Lobar consolidation; Viral = Diffuse/Bilateral/Interstitial infiltrates.
A parent asks when they should introduce solid foods to their 5-month-old. What developmental milestones and age-based guidelines should the CPN emphasize?
Show answer →Complementary foods should be introduced at approximately 6 months of age. Readiness signs include: sitting with little/no support, good head control, and the disappearance of the extrusion reflex (tongue-thrust). Rationale: Introducing solids too early (<4 months) is linked to obesity and allergies; waiting until 6 months aligns with gut maturity and nutritional needs. Exam Tip: PNCB emphasizes readiness signs over chronological age alone. The extrusion reflex disappearance is a high-yield indicator.
A preterm infant is being transitioned from the NICU to home on a regimen of fortified breast milk. What is the primary purpose of adding Human Milk Fortifier (HMF) to expressed breast milk for this population?
Show answer →HMF is added to increase caloric density (typically to 22, 24, or 30 kcal/oz) and to provide additional protein, calcium, phosphorus, and micronutrients that breast milk alone cannot provide for the rapid growth needs of preterm infants. Rationale: Preterm infants have higher metabolic demands and mineral requirements for bone mineralization than full-term infants. Exam Tip: Monitor for fortifier intolerance (abdominal distention, vomiting). Standard breast milk/formula is 20 kcal/oz.
An exclusively breastfed 4-month-old infant is seen for a well-check. What is the current Vitamin D supplementation requirement?
Show answer →All infants (breastfed or partially breastfed) should receive 400 IU of liquid Vitamin D daily starting shortly after birth. This should continue until the infant is weaned to at least 1 liter (approx. 32 oz) of Vitamin D-fortified formula or whole milk daily. Exam Tip: This is a must-know for the CPN. Vitamin D is essential for rickets prevention. Note that formula-fed infants usually meet this if consuming >32 oz/day.
Why must the nurse instruct parents to avoid all honey (including in baked goods) for infants under 12 months of age?
Show answer →Infant Botulism risk. Honey can contain Clostridium botulinum spores. An infant's immature digestive system allows these spores to germinate and produce a neurotoxin, leading to floppy baby syndrome (hypotonia), constipation, and potential respiratory failure. Exam Tip: This rule applies to ALL types of honey, even if pasteurized or cooked, as spores are heat-resistant.
A 3-year-old child insists on eating only peanut butter sandwiches for every meal for five days. How should the nurse advise the parent regarding food jags?
Show answer →Food jags are a normal developmental phase where a child prefers only one or two foods. Guidance: Continue to offer a variety of healthy foods alongside the preferred item without pressure. Jags are usually self-limiting and represent the toddler's quest for autonomy. Exam Tip: Focus on assessing growth and activity levels. If growth is normal, the nurse should normalize the behavior and discourage short-order cooking for the child.
A 20-month-old toddler presents for a well-child visit. According to the latest CDC and WHO recommendations, which growth chart should the nurse use to plot the child's weight and length?
Show answer →The WHO (World Health Organization) growth charts must be used for all infants and children from birth up to 24 months of age, regardless of gestation. The CDC growth charts are used for children aged 2 through 19 years. WHO charts are preferred for infants because they are based on high-quality data from breastfed infants in optimal environments. Exam Tip: PNCB frequently tests the age 2 (24 months) cutoff for switching from WHO to CDC charts. Using the wrong chart can lead to misclassification of growth disorders.
An infant was born at 28 weeks gestation and is now 6 months old chronologically. At what corrected age should the nurse plot the infant's anthropometric measurements on the growth chart?
Show answer →Corrected age = Chronological age (24 weeks) minus weeks of prematurity (40 - 28 = 12 weeks). 24 - 12 = 12 weeks (3 months). The nurse should plot measurements at the 3-month mark. Clinical Pearl: Corrected age should be used for growth and developmental screening until the child reaches 24 months of age. Failure to adjust for prematurity often leads to unnecessary referrals for growth failure or developmental delay. PNCB emphasizes the calculation of corrected age for any infant born before 37 weeks gestation.
A 7-year-old child has a calculated BMI at the 96th percentile for age and sex. How should the nurse interpret and document this finding based on standard BMI-for-age categories?
Show answer →BMI ≥ 95th percentile is classified as Obese. Categories: - Underweight: < 5th percentile - Healthy weight: 5th to < 85th percentile - Overweight: 85th to < 95th percentile - Obese: ≥ 95th percentile. Exam Strategy: Distinguish between Overweight and Obese. The 85th percentile is the threshold for overweight, while the 95th is the threshold for obesity. For children, BMI is always age- and sex-specific; never use adult BMI cutoffs (like 25 or 30) for pediatric patients.
A 3-year-old patient refuses to use the scary blood pressure cuff, calling it a snake that bites. This is an example of which Piagetian concept, and how should the CPN respond?
Show answer →Answer: Animism (Preoperational stage). This is the tendency to attribute lifelike qualities and intentions to inanimate objects. Response: Allow the child to touch the equipment or perform the procedure on a doll or stuffed animal first to decrease fear. PNCB Strategy: Avoid using metaphorical language like the machine will take your blood or bee sting, as the child takes these literally and imaginatively. Use neutral terms like arm hug.
During a transition-of-care meeting, a 16-year-old is asked to brainstorm potential barriers to taking their meds at college. Which Piagetian cognitive milestone allows the teen to perform this task?
Show answer →Answer: Hypothetical-Deductive Reasoning (Formal Operational). This is the ability to develop hypotheses about future events and systematically deduce the best path forward. Exam Strategy: This represents the highest level of Piaget's hierarchy. Distractor: Do not confuse this with Concrete Operational rule-following. Formal operations allow for complex situational analysis and thinking about thinking (metacognition). This is essential for successful transition to adult care.
A febrile 10-month-old requires a urine culture. The parent requests a urine bag to avoid invasive procedures. What is the most evidence-based response regarding CPN exam standards for UTI diagnosis?
Show answer →While urine bags are non-invasive, they have a high rate of contamination (>50%) and are NOT recommended for culture. A positive bag culture requires confirmation via catheterization or suprapubic aspiration. To diagnose a UTI in a non-toilet-trained child, a sterile specimen via catheterization is the gold standard. **Exam Strategy:** PNCB often tests the trade-off between convenience and diagnostic accuracy. Bag specimens are only useful for screening (negative results are reliable).
A 14-year-old with persistent asthma is prescribed ICS-formoterol as both a daily controller and a reliever (SMART). What is the primary rationale for using a LABA (formoterol) as a rescue medication instead of albuterol (SABA)?
Show answer →Formoterol is a unique Long-Acting Beta-Agonist (LABA) with a rapid onset of action (similar to albuterol) but provides sustained bronchodilation. Using it in combination with an Inhaled Corticosteroid (ICS) as a reliever (SMART/MART therapy) ensures the patient receives a dose of anti-inflammatory medication every time they treat symptoms, addressing the underlying inflammation immediately. PNCB emphasizes the shift away from SABA-only rescue in adolescents to reduce the risk of severe exacerbations. Key exam point: Formoterol is the only LABA currently recommended for this reliever role due to its quick onset.
A 6-year-old with Sickle Cell Disease presents with extreme fatigue. Hgb is 4.2 g/dL (baseline 8.0) and the Reticulocyte count is 0.1%. What does this low reticulocyte count indicate?
Show answer →Aplastic Crisis. Rationales: In a patient with Sickle Cell Disease, the baseline reticulocyte count is usually high (compensatory). A sudden drop in Hgb accompanied by a LOW reticulocyte count indicates the bone marrow has stopped producing RBCs, often triggered by Human Parvovirus B19. Distinction: In Vaso-occlusive crisis or Splenic Sequestration, the reticulocyte count remains high because the marrow is still functional. PNCB tests your ability to differentiate these crises using the reticulocyte count as the key diagnostic marker.
A 2-year-old is brought to the ED after ingesting an unknown amount of liquid drain cleaner. The child is drooling and has erythematous sloughing on the lips. What is the priority nursing intervention and what action is strictly contraindicated?
Show answer →Priority: Airway assessment and maintaining NPO status. Contraindication: Do NOT induce emesis or attempt to neutralize the substance with acid/alkali. Emesis re-exposes the esophagus to the corrosive agent, increasing the risk of perforation and aspiration. Clinical Pearl: PNCB often tests the no emesis rule for corrosives and hydrocarbons. Gastric lavage and activated charcoal are also generally avoided as they interfere with endoscopy, which is the definitive diagnostic tool for assessing esophageal damage within 24 hours.
17–20 correct
Strong. Move to the hardest material and timed drilling rather than re-reading topics you already know.
12–16 correct
A normal mid-prep score. Work the topics you missed one at a time — the topic pages below are built for exactly that.
Under 12 correct
Early days. Go topic by topic instead of taking more mixed tests: pick your weakest area below and drill it until the questions feel routine.
Pathology questions
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Management questions
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Assessment questions
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Basics questions
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Procedures questions
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Pharmacology questions
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Diagnostics questions
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