Preparing for the CPN (Certified Pediatric Nurse) exam? Diagnostics is one of the areas our deck drills hardest: 20 of its 1060 flashcards focus on diagnostics, covering topics like VCUG, Voiding Cystourethrogram. Try the sample questions below — every card is a real question-and-answer pair from the full deck.
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A 2-year-old presents with fever and lethargy. Lab results show WBC 18,500/mm³, 72% Segs, and 15% Bands. What is the clinical interpretation of this shift to the left?
Show answer →A shift to the left indicates an increase in immature neutrophils (bands >10%), signaling that the bone marrow is releasing white cells prematurely to fight a severe infection, typically bacterial. Exam Strategy: PNCB emphasizes distinguishing bacterial from viral patterns. Bacterial infections usually show neutrophilia and a left shift, whereas viral infections often present with lymphocytosis. In neonates, the I:T ratio (immature to total neutrophil ratio) >0.2 is a more sensitive indicator of sepsis than the total WBC count.
A 3-week-old infant presents with projectile vomiting. Labs: Na+ 132, K+ 3.1, Cl- 88, and HCO3- 34. What acid-base imbalance and diagnosis does this represent?
Show answer →Hypochloremic, hypokalemic metabolic alkalosis; likely Hypertrophic Pyloric Stenosis. Rationales: 1. Metabolic Alkalosis: High HCO3- and pH due to loss of gastric hydrochloric acid (H+ and Cl-). 2. Hypokalemia: The kidneys attempt to conserve H+ by excreting K+. 3. Hypochloremia: Direct loss from gastric contents. Exam Strategy: This is a classic board electrolyte pattern. PNCB expects you to recognize that these patients must be metabolically stabilized (rehydrated and electrolytes corrected) BEFORE surgical intervention (pyloromyotomy).
A 4-year-old is hospitalized for dehydration. The nurse notes a Platelet count of 12,000/mm³, but WBC and Hgb are normal. Assessment shows generalized petechiae. What is the likely diagnosis?
Show answer →Immune Thrombocytopenic Purpura (ITP). Rationales: ITP is characterized by isolated thrombocytopenia (Plt <100k) in an otherwise healthy child, often occurring 1-4 weeks after a viral illness. Exam Strategy: PNCB looks for the isolated nature of the lab finding. If the child had low WBC and low Hgb (pancytopenia) along with low platelets, the priority would shift to ruling out Leukemia or Aplastic Anemia. Management of ITP focuses on injury prevention; IVIG or steroids may be used if bleeding is significant.
Which strategy is most appropriate when preparing a 4-year-old (preschooler) for an upcoming Voiding Cystourethrogram (VCUG)?
Show answer →Use simple, concrete terms and allow the child to touch non-sterile equipment (like the catheter tubing). Explain the sting or pressure just before it happens. Use a doll to demonstrate. Rationale: Preschoolers are magical thinkers and fear bodily harm. Preparation should occur shortly before the procedure (same day) to prevent prolonged anxiety. Avoid saying it won't hurt; instead, describe sensations. Exam Tip: Distinguish between school-age (can prep days in advance) and preschoolers (immediate prep).
When assisting with a bedside X-ray on a neonate in the NICU, the nurse follows the ALARA principle. What are the three primary components of this principle?
Show answer →Time, Distance, and Shielding. Rationale: ALARA (As Low As Reasonably Achievable) aims to minimize radiation exposure. 1) Time: Minimize time near the source. 2) Distance: Maximize distance (at least 6 feet). 3) Shielding: Use lead aprons and thyroid shields. In pediatrics, this also involves Child Sizing the dose (lowest possible settings). Exam Tip: PNCB focuses on the nurse's role in protecting the patient, themselves, and others during portable imaging.
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Try 30 free CPN cards firstThe full CPN deck contains 1060 flashcards, and 20 of them focus on diagnostics. This page shows 5 free samples.
Our CPN deck dedicates 20 of 1060 cards (2%) to diagnostics — always cross-check the official PNCB exam outline for the current blueprint weighting.
Yes — the samples on this page are free, and the CPN preview page has 30 more free cards. Full access to all 1060 cards is a one-time $7.
Assessment
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Basics
90 cards
Dental
10 cards
Management
250 cards
Pathology
330 cards
Pharmacology
70 cards
Procedures
70 cards
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